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• Dual booting windows 8/ubuntu 12.04. Grub doesn't appear and machine never boot in ubuntu

  - by black sensei

  i got a new ACER predator AG3620-UR308 which came with windows 8, so i wanted to run ubuntu 12.04.2 on it as a dual booting. To be honest, i've been doing dual booting for a while now so, i did the right thing. the box came with 2TB HDD. so i made 4 partitions with a raw partition just after the windows installation partition I always do manual installation so even if ubuntu didn't detect windows 8, it was ok for me. So i created swap area and finished the installation etc....Grub was install on the only drive there which is sda. After reboot, grub doesn't even come up.So it always boot in windows 8. I did repeat the installation process twice and yield same result. which is weird because this method always works for me so far.Even the laptop am using to write this post is a dual booting windows 7/ mint nadia installed the same way. Is there anything new in windows 8 that i didn't make provision for? Before starting the installation, all i read about was that , windows 8 should be installed first and ubuntu after. I went ahead and disable secure boot from the BIOS and enabled CSM (don't even know what it means) according to Acer custhelp site . I boot from USB and did fdisk -l bellow is the result: ubuntu@ubuntu:~$ sudo fdisk -l WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sda: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x8c361cb5 Device Boot Start End Blocks Id System /dev/sda1 1 3907029167 1953514583+ ee GPT Partition 1 does not start on physical sector boundary. Disk /dev/sdb: 8178 MB, 8178892800 bytes 255 heads, 63 sectors/track, 994 cylinders, total 15974400 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0006a87e Device Boot Start End Blocks Id System /dev/sdb1 * 2048 15972351 7985152 b W95 FAT32 ubuntu@ubuntu:~$ Can anybody shed some light? thank you in advance

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• Dual booting windows 8/ubuntu 12.04.2, Grub doesn't appear and machine never boot in ubuntu

  - by black sensei

  i got a new ACER predator AG3620-UR308 which came with windows 8, so i wanted to run ubuntu 12.04.2 on it as a dual booting. To be honest, i've been doing dual booting for a while now so, i did the right thing. the box came with 2TB HDD. so i made 4 partitions with a raw partition just after the windows installation partition I always do manual installation so even if ubuntu didn't detect windows 8, it was ok for me. So i created swap area and finished the installation etc....Grub was install on the only drive there which is sda. After reboot, grub doesn't even come up.So it always boot in windows 8. I did repeat the installation process twice and yield same result. which is weird because this method always works for me so far.Even the laptop am using to write this post is a dual booting windows 7/ mint nadia installed the same way. Is there anything new in windows 8 that i didn't make provision for? Before starting the installation, all i read about was that , windows 8 should be installed first and ubuntu after. I went ahead and disable secure boot from the BIOS and enabled CSM (don't even know what it means) according to Acer custhelp site . I boot from USB and did fdisk -l bellow is the result: ubuntu@ubuntu:~$ sudo fdisk -l WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. Disk /dev/sda: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x8c361cb5 Device Boot Start End Blocks Id System /dev/sda1 1 3907029167 1953514583+ ee GPT Partition 1 does not start on physical sector boundary. Disk /dev/sdb: 8178 MB, 8178892800 bytes 255 heads, 63 sectors/track, 994 cylinders, total 15974400 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0006a87e Device Boot Start End Blocks Id System /dev/sdb1 * 2048 15972351 7985152 b W95 FAT32 ubuntu@ubuntu:~$ Can anybody shed some light? thank you in advance EDIT Hey, i just did another trial with 13.04 this time and still no luck. bios: secure-boot: disabled enable CSM : always 1-delete previous ubuntu partition and swap area partition.now having free space 2- used usb installer to prepare usb with ubuntu-13.04-desktop-amd64.iso 3- rebooted : liveusb didnt detect windows 8, used something else 4-created partition ext4 for / 5-created partition for swap-area 6- default grub path is /dev/sda and clicked install Acer always boots into windows.

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• Are Sony Vaio S series or T series laptops compatible with both windows 7 and Ubuntu 12.04 in dual-boot installation

  - by rini

  I am planning to buy a new laptop which is suitable for both Ubuntu 12.04 and windows 7 in dual boot configuration. I am looking for Sony Vaio two models with configurations: 13.3" S series Customizable laptop ( SVS131190S) 3rd gen Intel® Core™ i5-3210M processor (2.50GHz / 3.10GHz with Turbo Boost) Intel® HD Graphics 4000 4GB (4GB fixed onboard + 1 open slot) DDR3-1333Mhz 500GB (5400rpm) hard drive 13.3" T series Customizable ultrabook 3rd gen Intel® Core™ i7-3517U processor (1.90GHz / 3.00GHz with Turbo Boost) Intel® HD Graphics 4000 500GB (5400rpm) + 32GB MLC hybrid hard drive with RAID 0 6GB (4GB fixed onboard + 2GB removable) DDR3-1333Mhz Can anyone please tell me which laptop will function better for dual booting? Any help/comments are really appreciated.

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• Dual boot centOS and Win7

  - by user1855965

  I posted this on stackoverflow, but it looks like superuser would be more appropriate. I have a CentOS 5 machine that runs Windows 7 as a dual boot. CentOS is the main OS and each OS is set up in a specific hard drive. This was set up before I joined the company and I don't really have need to run Windows now. My question is: can I, from CentOS, reformat the Windows HD, change GRUB settings and get the HD to be available on CentOS? Happy to provide more info if this helps. Many thanks for your help and apologies if this is a very simple issue... I don't want to blindly test things on this machine as it is used on a daily basis by several users.

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• Procedure for dual booting (2 copies of Win-7) off 2 partitions on same disk

  - by Sam Holder

  What procedure should I follow to set a dual boot (both Win-7 x64) on a machine where (ideally): Both operating systems will be installed on the same physical disk in different partitions When booting into either operating system the contents of the other OS partition disk will not be seen (this just seems safer) Other hard drives in the system will be visible by both OS's 1 copy of Win7 is already installed. Is it as simple as shrinking the existing volume and creating the partition, then sticking the CD in and booting off it and formatting the new partition and then installing another copy of windows onto the new partition? Or will that not work? Or are there gotchas?

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• Dual Monitors don't turn off/sleep when they should

  - by Mario

  Details: Dual 25" monitors connected to HP Envy via HDMI and display port via DVI adapter. Power scheme is set up in high performance (Dim Display: Never - Turn Off Display: 15 mins - Computer Sleep: Never) Screensaver is set up to kick in after 10 mins of idle (which happens) 5 minutes later, the screensaver stops. The "Monitor Going to Sleep" notice appears on screen and monitors go to sleep briefly. All is well thus far. Suddenly, the Windows 7 alert sound when a device is unplugged is heard. Monitors then turn back on. Screens are black. Only the mouse cursor is displayed. Backlighting is back on. This only started happening after I obtained and connected the second 25" monitor a few days ago. However, I had a 24" in its place before, and this wasn't happening. Why is this happening and how do I correct this behavior? Thanks in advance.

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• Is dual booting ubuntu and fedora/openSUSE as easy as popping in a liveCD?

  - by user25757

  I wish to dual boot ubuntu (currently installed) with fedora and/or openSUSE (fedora for vanilla gnome and SUSE for a good KDE experience). I do not know much about dual booting and grub. Do I only have to put in the liveCD and install side by side? Or do I have to partition and stuff? Also, is there an easy way to remove one if I do not want it? Please note that I do not want them on the same /home partition, I want them to have a different one each. (and also if there is a way that is mostly graphical and user friendly, it would be most appreciated)

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• Virtual Box start from dual boot systme

  - by Richard

  So for a long time now, I've been running Linux on a dual boot system with Windows 7. I don't run Windows very often, however it happens enough now that I started looking at alternatives to reboots. A friend showed me Parallels on his Mac, and I fell in love with the concept of Virtual machines. Since Sun has been in the Unix space since the beginning of time, they likely have the best solution for Linux (big assumption I know). Anyway, to avoid re-installing windows, as I have it set up the way I like it now, I was wondering if there was a way to point to the existing install and boot from that point. Linux is installed on /dev/sda Windows is on /dev/sdb Having never done this before a little handholding would be great as to what step I should take. Thanks for any help in advance!

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• Dual-boot more than two operating systems

  - by aldorado

  I currently run Windows 7 and Ubuntu 12.04 as a dual-boot system. I need Linux, but Ubuntu freezes at least once a day. So I want to replace it with another distribution like Debian or LMDE. On the other hand I am a little concerned that I'll have troubles working with a less user friendly operating system than Ubuntu. So would it be possible to just scale down the Windows partition and install the next Linux as a third system? Thus, with a "triple-boot system" I could keep Ubuntu until I feel familiar with the new system. Afterwards, I guess, it should be possible to replace the Ubuntu partition by expanding the new system?

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• How to remove GRUB from dual boot (Debian and Windows XP)

  - by All

  I have a computer witch cannot be boot from CD or USB. I have Debian and Windows XP with dual boot via GRUB. Now I want to uninstall Debian and GRUB and restore the Windows MBR. I can enter boot Debian and Windows OSes, but no boot from CD or USB for recovery. How can I remove GRUb and restore MBR from within Windows XP or Debian? NOTE: I asked this question before, but after accepting the answer, I found that Windows XP does not have fdisk command. However, I think it is too late to continue the discussion there; thus, I asked this brand new question.

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• Building new GIS Workstation - is it worth upgrading to a workstation GPU?

  - by bsigrist

  We are currently building a machine from scratch to act as a GIS workstation. The primary software used is ESRI's ArcGIS and we are mainly working with vector data using raster data only for contextual background imagery. In the past I have built a GIS machine and used a consumer grade gaming GPU (Nvidia 9800GT) and found it to perform fine. However, I have always wondered if I would have been better off equipping it with a workstation GPU such as a Quadro series. Would a workstation GPU make a noticeable difference doing 2D GIS operations or should I save money on the build and equip it with another 9800GT?

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• Windows 2000 uninstall on a dual-boot 2000/XP system

  - by Viktor

  While several questions have already been answered about removing an OS from a dual-booting machine, most refer to Windows 7 vs. Linux/Vista/XP. I have W2K installed on my older HDD (Drive C). Later on I bought a new HDD and installed XP's under W2K environment. Each time I turned my PC on, I had the choice of W2K or XP OS, which I still have. I eventually stopped using the w2k OS and as the older HDD where this OS is installed is getting old, I plan to remove it completely. The problem is that the active master boot record is on this very HDD. So when I remove the HDD, I get no OS loader, no matter what boot drive I choose in BIOS. Apparently I have to set the boot record on the newer HDD with XP's. Some advise to use the bootable XP CD and try to set the active MBR from there.. I don't have the CD anymore. Regardless, I suspect there is much less to solving this problem than running the recovery console, like a simple boot.ini file edit. But I might be wrong.

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• Mouse click-focus wanders in vmPlayer 3.0 dual-monitor

  - by Gary M. Mugford

  Previously, a WinXPSP3 session running on a WinXPSP3 host computer ran perfectly fine in a dual monitor setup. No issues with vmPlayer 2.x. BEFORE updating to vmPlayer 3, the following problem cropped up. When clicking in a single monitor, you would get exactly what you expected. However, when the display was stretched across two monitors, the clicking would be to the left of the mouse cursor. The farther RIGHT you were, the farther left the click would occur. In other words, if you clicked on the system menu of a window in the upper left of a window on the left monitor, you would get the system menu. Move half a screen to your right and the click would be on an item about a quarter of the way over, rather than where you were clicking. And by going all the way to the far right of the right monitor, you could bring up a right-click menu on the far right of the LEFT monitor. I Hope I have described this properly. It's confusing, even in words. In single monitor mode, everything works perfectly fine. If, instead of using either UltraMon or DisplayFusion, you run a single desktop across both monitors (3200x1600), there are no mousing issues. Unfortunately, having two 1600x1200 monitors, that depth of 1600 makes that hack less than useable. My graphic card won't offer anything resembling 3200x1200. vmPlayer 3.0 did not alleviate the situation. The microsoft mouse drivers are up to date and so are the nVidia card drivers. Any ideas?

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• Dual booting Linux/Win7, Grub refuses to load Win7

  - by JohnB

  Decided to give Linux Mint a try (Ubuntu's interface annoys me), so I installed it with the intention of dual booting with Windows 7. Installation went fine, but now I can only boot into Linux Mint. Grub lists two Windows 7 menu options, but selecting either of them causes an "unknown file system" error and dumps me into a Grub recovery prompt. There, I have to manually reset the root and prefix options, as they reset hd0,msdos6 when they should be hd0,msdos5. I ran Boot Repair twice, once to fix grub errors, once to rebuild the MBR, but it didn't fix anything. Here is the log: http://paste.ubuntu.com/1029675/ fdisk output: Device Boot Start End Blocks Id System /dev/sda1 * 2048 206847 102400 7 HPFS/NTFS/exFAT /dev/sda2 206848 1486249145 743021149 7 HPFS/NTFS/exFAT /dev/sda3 1486249982 1953523711 233636865 5 Extended /dev/sda5 1486249984 1945141247 229445632 83 Linux /dev/sda6 1945143296 1953523711 4190208 82 Linux swap / Solaris grub.cfg: ### BEGIN /etc/grub.d/30_os-prober ### menuentry "Windows 7 (loader) (on /dev/sda1)" --class windows --class os { insmod part_msdos insmod ntfs set root='(hd0,msdos1)' search --no-floppy --fs-uuid --set=root 86184D18184D091F chainloader +1 } menuentry "Windows 7 (loader) (on /dev/sda2)" --class windows --class os { insmod part_msdos insmod ntfs set root='(hd0,msdos2)' search --no-floppy --fs-uuid --set=root 56D84F84D84F60FB chainloader +1 } ### END /etc/grub.d/30_os-prober ### I have found a few similar troubleshooting guides so far, but so far no amount of updating/configuring Grub has been successful. Last resort is, I suppose, use the W7 recovery disc and start over. Thanks in advance! Linux Mint 13 Maya, 64-bit Windows 7 Home Edition, 64-bit

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• Windows 7 - How to access my documents from Windows 8 (dual boot)

  - by msbg

  I am dual booting Windows 7 and Windows 8 on two different partitions of the same drive: Win7: (C:) Win8: (D:) I am trying to get access to my Win7 user folder (C:\Users\Mason) in order to access my Win7 documents folder (C:\Users\Mason\Documents) from Windows 8. When I try to on Windows 8, I get an error message saying "You don't have permission to access this folder. Click here to permanently get access to this folder". When I click, the progress bar in Windows Explorer slowly moves to the maximum and disappears. When I try opening the folder, I get the same error message. When editing security permissions for the folder in Windows 8, Explorer freezes. I do not know how to remove the restrictions from Windows 7. I checked the Windows 8 user folder (D:\Users\Mason) and it had the group or user name: "S-1-5-21-936898901-3363470404-1273668825-1001". I tried copying and pasting it into the Win7 User Folder Permissions, but got the error "An object with the following name cannot be found". How would I access my folders?

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• Dual Monitor Setup with Ati Radeon Hd 5700 results in unusabledesktop win7

  - by NorthPole

  I have an ATI Radeon HD 5700 card which i've been using under fully updated windows 7 with its latest drivers. My monitor is a 2004 NEC LCD1703M which despite being pretty old runs fine. A friend gave me an IIYAMA ProLite E1900WS monitor (2009 or 20010 ). Both monitors are vga only. I've been using a DLDVI to VGA adapter to connect my old monitor and tested the same adapter to the new monitor and it worked fine. So I bought an HDMI to vga adapter with the purpose of having a dual monitor setup. But when both screens are connected to the card the following problem occurs: The monitor connected to the hdmi port cycles between sleep and a black screen while the other shows the operating system for about two seconds before getting black for another two seconds. I can "use" the computer (move the mouse,click,type e.t.c.) while this happens but its not something pleasant. I tried reinstalling the driver, booting with both screens connected (in which case the powerup messages and the bios are mirrored in both screens until I get to the login screen where everything falls apart) Funny thing is, everything works if I disconnect the ATI graphics card and use the onboard intel one. So, any suggestions as to what might be the problem and how I can fix it?

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• Safely removing my linux dual boot

  - by de1337ed

  Currently, I dual boot with win7 and opensuse 12.1. Is it okay if I first restore the MBR for win7, and then format the linux drives? Or would it be better for me to first format the linux drives, and then restore the MBR? The reason I ask this is sometimes I get nasty errors when I try and boot into my win7 cd in the latter method. Is it possible to restore the MBR without having to boot into the win7 cd? Like, can I remove linux using the disk management utility in win7, and then fix the mbr while I'm still in win7, or do I have to boot into the win7 cd? If I can do this, how do I go about doing so? Thank you. EDIT::::: The spamming of f8 didn't work, it just made loud beeping noises, so I decided to simply boot into my windows disk and use the bootsect /nt60 SYS /mbr command. Note: I haven't formatted my linux partition yet. After I did that, I restarted my computer, and nothing happened. Basically, GRUB is still the MBR and I'm still able to access openSUSE. I think the reason why this is happening is because I think my GRUB is on a separate partion than the linux OS. Here is a picture of my diskmgmt in win7: . openSUSE did all the partioning stuff for me. All I know is that the 40gb that is there is where openSUSE is installed, but I have no clue what's on the 6.05gb and the 14.75gb partitions. Can anyone help me find which partition GRUB is on, and then remove it so I can restore the windows MBR? Thank you.

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• Dual-monitor Windows XP, monitors are "identified wrong"

  - by Susan

  Trying to use a dual-monitor desktop system with Windows XP.... 1 graphics card... with digital/analog outputs. Picking: Desktop - Properties - Settings - Identify It shows "2" as my left monitor... and "1" as my right. How do I switch them around? Here's what I've tried so far: Switch the cables (I can't. I need the digital cable on the better monitor.) Switch the monitors (I can't. One has a few dead pixels.) Drag the 1+2 graphics around (That doesn't change the IDENTIFY numbers.) Pick "use as primary" or "extend" (That doesn't change the IDENTIFY numbers.) Anything else I can try? What exactly controls/switches the "IDENTIFY numbers" around? I know it can be done. For weeks I ran this exact set-up... with the CORRECT numbers appearing on the monitors.... then just recently... after a few reboots... they now appear "switched around".

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• Install Debian stable linux ISO from USB to dual boot Windows

  - by tgkprog

  I want debian as dual boot with my windows vista, Free'd up 50GB in my d drive. Plan to use 40 for debian install, 6GB for swap space Have a 16GB USB drive Downloaded http://unetbootin.sourceforge.net/ Downloaded DVD files of stable debian-7.0.0-amd64-DVD-1.iso ( debian-7.0.0-amd64-DVD-2.iso and 3) After I choose HD install, unetbootin says place the ISO in the same place. but I have 3. do i need to merge them? if so any freeware to do that? can i do it with 7zip? when I extract with 7 zip there are classes between the 3 ISO files. Just over write? Options to merge (format etc for 7zip) ? Or I must use I tried to keep the 3 files with the other unetbootin files but get an error msg Files I have on my USB 06/30/2013 11:44 PM 2,835,648 ubnkern 06/05/2013 12:14 AM 3,998,007,296 debian-7.0.0-amd64-DVD-1.iso 06/04/2013 03:30 PM 4,696,872,960 debian-7.0.0-amd64-DVD-2.iso 06/05/2013 01:25 AM 4,698,955,776 debian-7.0.0-amd64-DVD-3.iso 06/30/2013 11:45 PM 6,530,278 ubninit 06/30/2013 11:46 PM 155 syslinux.cfg 06/30/2013 11:46 PM 60,928 menu.c32 also i can only copy above files if i format my USB as NTFS On FAT32 says too large to copy .iso How do I get around that? My internet needs a login so cannot do net install

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• GPU Computing - # of GPUs supported

  - by TehTypoKing

  I currently have a desktop with 6 GPUs ( 3x HD 5970s ) in non-crossfire mode. Unfortunately, it seems that Windows 7 64bit only supports up to 4 GPUs. I have not been able to find a reliable source to deny or confirm this. If windows 7 has this limitation, is there a Linux flavor that supports more than 4 GPUs? In-case you are wondering, this is not for gaming but high-speed single precision computing. With this current setup ( if I can find 6gpu support ) I am looking to reach 13.8 Teraflops. Also, my motherboard does support 3 16x pci-xpress gen2 slots... and I have a 1500w powersupply plugged into a 20amp outlet. Windows is able to detect all 6 cores.. although, 2 of which displays the warning "Drivers failed to load". To recap: - Can windows support 6 GPUs? - If not, does Linux? Thank you.

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• Memory Size Allocation on GPU - opengl texture loading question

  - by beyondsleepytime

  I'm loading pixels from an image which is 32 w by 32 height. The format I'm loading them in is ARGB via java. When I bind this to the video card, I can expect that the video card might use somewhere around 32*32*4 bytes, or 4K. Similarly, 1024 w, 1024 h would be 1024*1024*4 = 4MB. Is my understanding correct? Now I understand where all the memory goes!

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• How to uninstall Ubuntu 12.04 LTS dual booting with Windows 7?

  - by user103799

  I need to uninstall Ubuntu 12.04 LTS from my laptop. It's currently dual booting with windows 7. I've searched and found some ways to do this, but all use some kind of a CD to complete the deletion. I have neither the Ubuntu Live CD nor Windows Install CD/Recovery CD. This laptop did not come with one, and I unfortunately have no available storage device to make a recovery CD. Is there a way to completely uninstall Ubuntu 12.04 LTS dual booting without using any hardware? If there's no way, then how to uninstall using the least hardware possible? Or easy to find hardware? I've nothing against Ubuntu. I installed this as a backup/alternative to error-prone Windows 7. However, after a hardware upgrade, including extra RAMs and a new, better CPU, Windows 7 runs smoothly again. Now I'm running low on hard drive space and need the 40 gig or so of space I partitioned for Ubuntu back. Any help is appreciated, and thanks in advance!

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• Cuda driver, CPU/GPU performances issue

  - by elect

  I implemented a RNS Montgomery exponentiation in Cuda and on cpu for comparison. Everything nice everything fine. It runs on just one SM. However I am going to tell you some strange regression in both cpu/gpu performances. During the devoloping, about two month ago, I was using Cuda 5 preview on Ubuntu 11.04 64b. In this time, I reach the following performances: cpu 460ms gpu 120ms Then one day when I turn on the pc, the graphical environment didnt start. I dont know which was the problem, however I switched to the console and installed again the Cuda driver. At the following boot performances changed: cpu 310ms gpu 80ms I was like Q.Q...uhm ok, nice to see this, but I was wondering how that could be possible However, I went then in holiday for 10 days and I continued developing and optimizing on my notebook (but not the same part of the code, some additional stuff) When I was back, I just updated the source files, and performances came back to 460/120ms.. I couldnt believe it, I tried to install Cuda 5 RC, updating the video driver too... nothing changed... I checked Debug/Release, Cuda computability, but the problem seems being somewhere else.. Looking around the net I found this, I am pretty sure it must have something to do with the driver, because the performance change affected both cpu and gpu Do you have some tips/ideas/suggestions?

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• OpenGL : sluggish performance in extracting texture from GPU

  - by Cyan

  I'm currently working on an algorithm which creates a texture within a render buffer. The operations are pretty complex, but for the GPU this is a simple task, done very quickly. The problem is that, after creating the texture, i would like to save it. This requires to extract it from GPU memory. For this operation, i'm using glGetTexImage(). It works, but the performance is sluggish. No, i mean even slower than that. For example, an 8MB texture (uncompressed) requires 3 seconds (yes, seconds) to be extracted. That's mind puzzling. I'm almost wondering if my graphic card is connected by a serial link... Well, anyway, i've looked around, and found some people complaining about the same, but no working solution so far. The most promising advise was to "extract data in the native format of the GPU". Which i've tried and tried, but failed so far. Edit : by moving the call to glGetTexImage() in a different place, the speed has been a bit improved for the most dramatic samples : looking again at the 8MB texture, it knows requires 500ms, instead of 3sec. It's better, but still much too slow. Smaller texture sizes were not affected by the change (typical timing remained into the 60-80ms range). Using glFinish() didn't help either. Note that, if i call glFinish() (without glGetTexImage), i'm getting a fixed 16ms result, whatever the texture size or complexity. It really looks like the timing for a frame at 60fps. The timing is measured for the full rendering + saving sequence. The call to glGetTexImage() alone does not really matter. That being said, it is this call which changes the performance. And yes, of course, as stated at the beginning, the texture is "created into the GPU", hence the need to save it.

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• Help! Problem dual boot ubuntu windows8 (can't start ubuntu) [duplicate]

  - by a35

  This question already has an answer here: Installing Ubuntu on a Pre-Installed Windows 8 (64-bit) System (UEFI Supported) 5 answers EDIT: I know that there are many topics about dual boot ubuntu windows8, i have read them, my problem is that i cant boot ubuntu neither from HDD nor from live USB. I know about boot repairing, but how can I use it, If i cant boot ubuntu?? I heard about terrible problems with windows 8-linux dual boot, but I really need ubuntu because of school. I read many tutorials how to install ubuntu next to windows8, but despite that a problem accured. Here is what I have done. I have MSI GE60, windows(64bit) is running on mSATA SSD C drive. HDD is divided to two partitions for windows and I left there 50GB for ubuntu. I downloaded ubuntu 12.04.3desktop-amd64(64bit), created bootable USB using Universal USB Installer (recommended on Ubuntu site). I disabled USB legacy support (that Ubuntu could be installed in EFI mode- I was following instructions on Ubuntu site), and also Secure Boot (windows is now angry with me because I turned it off- when I start windows it informs me I should enable that). I inserted USB rebooted computer and chose install ubuntu, divided free 50GB space to swap(2000MB) and rest as ext4 main storage space for ubuntu. Installation passed normally, Ubuntu then asked me to reboot computer. After reboot windows 8 started. Now I can't start ubuntu. When I restart win8 to uefi there is possibility to boot ubuntu, but when I choose it, it crashes. When I choose try ubunfu from connected USB, nothing happend, still dark screed. What is wrong? Can you help me? I am in hurry to do it because of school. Thanks.

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