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• After Upgrading to 12.04 the Kernel won't Initiate

  - by Jeff

  I had 11.10 and tried to upgrade recently, via the installer pop-up reminder. Afterwards it would not boot, citing an issue with the kernel. So I've setup a 12.04 installation USB, which appears to work fine. The problem is it doesn't provide an upgrade option, just format and install or install alongside the current broken kernel. I believe I should be able to still get the information from the broken OS after installing alongside, but if there is a way to fix this more directly that would be preferable.

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• Newly compiled (patched with -ck) 3.3 kernel won't boot up

  - by Shiki

  Screen is garbled. Reaaaally garbled. Like some sort of scrambling image from a movie. I can upload some pictures if needed. To be short with the description. Here is my 3.3 + ck .config file: http://pastebin.com/aP2F9RcH The dmesg log of the failed kernel: http://pastebin.com/esc2Rtka The computer is a ThinkPad T500 laptop. I have selected everything needed for the computer (as far as I can tell, but check the .config). The normal generic Ubuntu kernel boots and works perfect!

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• Inside Red Hat Enterprise Linux 6 Kernel

  Red Hat's kernel is a hybrid of best-of-breed technologies, it claims, yet this version remains consistent with previous Red Hat releases.

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• Ubuntu 12.04 PXELINUX does not boot RHEL Kernel and Initrd

  - by utpal

  I have successfully setup PXE server on Ubuntu 12.04 with DNSMASQ for DHCP Proxy Service, TFTPD-HPA for TFTP service, NFS-KERNEL-SERVER, APACHE2 and SYSLINUX for pxelinux.0 bootloaded needed for pxe boot using the following POST: http://ubuntuforums.org/showthread.php?t=1606910 I was successfully able to pxe boot a client to a Ubuntu 12.04 LIVE CD. Next, I want to PXE boot a client to a RHEL 6.5 x64 Kernel and initrd image. I dont want to install, just boot a client so that it mounts initrd and I can get a minimal filesystem on the client. How can I do that? Please Help!!

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• Upgrade from 10.04 to 11.04, must maintain minimum kernel 2.6.38

  - by Steve

  I have a machine running 10.04 and am using BTRFS with lzo compression. I upgraded the kernel to 2.6.38 to enable this (using a PPA). I have my /home folder on a separate (4 TB) BTRFS drive. / is on ext4. My only complaint with this setup is that it uses the old BTRFS tools. How can I upgrade first to 10.10, then 11.04 as required, when 10.10 uses 2.6.35? I don't want it to crash/choke on mounting /home. Will it just let me keep booting the newer kernel I have while upgrading?

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• "More Support for the Kernel"

  Oracle developers continue their contributions to the Linux kernel.

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• Random process hangs after clean install

  - by Toshe

  After installing fresh Kubuntu 11.04 Natty on my desktop PC, I experienced some issues with application and process hangs. There is also a problem with my USB 3 hard disk. These sort of problems did not happen on Kubuntu 10.10 installed on the same PC (on separate partition). The hangs manifest themselves with kernel log messages like these: [ 960.480151] INFO: task amarok:2505 blocked for more than 120 seconds. [ 960.480153] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 960.480155] amarok D 0000000000000000 0 2505 1 0x00000000 [ 960.480158] ffff8800a556bb38 0000000000000086 ffff8800a556bfd8 ffff8800a556a000 [ 960.480162] 0000000000013d00 ffff8800cb7f3178 ffff8800a556bfd8 0000000000013d00 [ 960.480165] ffffffff81a0b020 ffff8800cb7f2dc0 ffffea000242ac58 ffff88012704c870 [ 960.480169] Call Trace: [ 960.480172] [<ffffffff815c19f7>] __mutex_lock_slowpath+0xf7/0x180 [ 960.480175] [<ffffffff815c144b>] mutex_lock+0x2b/0x50 [ 960.480180] [<ffffffffa0d0ad42>] video_open+0x102/0x400 [cx8800] [ 960.480183] [<ffffffff815c2cbe>] ? _raw_spin_lock+0xe/0x20 [ 960.480186] [<ffffffff8117c55d>] ? __d_lookup+0x10d/0x170 [ 960.480191] [<ffffffffa0ca0731>] v4l2_open+0x101/0x130 [videodev] [ 960.480194] [<ffffffff81168f4a>] chrdev_open+0xda/0x1f0 [ 960.480197] [<ffffffff81168e70>] ? chrdev_open+0x0/0x1f0 [ 960.480200] [<ffffffff81162cee>] __dentry_open+0xce/0x2f0 [ 960.480202] [<ffffffff8116ef33>] ? generic_permission+0x23/0xc0 [ 960.480205] [<ffffffff811641e1>] nameidata_to_filp+0x71/0x80 [ 960.480208] [<ffffffff811733c8>] finish_open+0xc8/0x1b0 [ 960.480210] [<ffffffff811725b7>] ? do_path_lookup+0x87/0x160 [ 960.480213] [<ffffffff81173b88>] do_filp_open+0x2c8/0x7c0 [ 960.480216] [<ffffffff81172902>] ? user_path_at+0x62/0xa0 [ 960.480219] [<ffffffff81131d4d>] ? handle_mm_fault+0x16d/0x250 [ 960.480222] [<ffffffff812e6c47>] ? __strncpy_from_user+0x27/0x60 [ 960.480225] [<ffffffff81180ea7>] ? alloc_fd+0xf7/0x150 [ 960.480228] [<ffffffff8116425a>] do_sys_open+0x6a/0x150 [ 960.480230] [<ffffffff81164360>] sys_open+0x20/0x30 [ 960.480233] [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b [ 1080.480027] INFO: task knotify4:1663 blocked for more than 120 seconds. [ 1080.480030] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1080.480032] knotify4 D 0000000000000000 0 1663 1 0x00000000 [ 1080.480036] ffff880123a2bb28 0000000000000082 ffff880123a2bfd8 ffff880123a2a000 [ 1080.480040] 0000000000013d00 ffff880121003178 ffff880123a2bfd8 0000000000013d00 [ 1080.480044] ffff8800cb7e16e0 ffff880121002dc0 ffffffff81060a27 ffff88012704c870 [ 1080.480048] Call Trace: [ 1080.480054] [<ffffffff81060a27>] ? mutex_spin_on_owner+0x97/0xd0 [ 1080.480059] [<ffffffff815c19f7>] __mutex_lock_slowpath+0xf7/0x180 [ 1080.480069] [<ffffffff812e4f61>] ? vsnprintf+0x221/0x620 [ 1080.480072] [<ffffffff815c144b>] mutex_lock+0x2b/0x50 [ 1080.480076] [<ffffffffa0b2d10f>] cx8802_request_acquire+0x5f/0xf0 [cx8802] [ 1080.480081] [<ffffffffa0e87e08>] mpeg_open+0x78/0x270 [cx88_blackbird] [ 1080.480084] [<ffffffff8117c55d>] ? __d_lookup+0x10d/0x170 [ 1080.480092] [<ffffffffa0ca0731>] v4l2_open+0x101/0x130 [videodev] [ 1080.480096] [<ffffffff81168f4a>] chrdev_open+0xda/0x1f0 [ 1080.480099] [<ffffffff81168e70>] ? chrdev_open+0x0/0x1f0 [ 1080.480102] [<ffffffff81162cee>] __dentry_open+0xce/0x2f0 [ 1080.480105] [<ffffffff8116ef33>] ? generic_permission+0x23/0xc0 [ 1080.480108] [<ffffffff811641e1>] nameidata_to_filp+0x71/0x80 [ 1080.480111] [<ffffffff811733c8>] finish_open+0xc8/0x1b0 [ 1080.480113] [<ffffffff811725b7>] ? do_path_lookup+0x87/0x160 [ 1080.480116] [<ffffffff81173b88>] do_filp_open+0x2c8/0x7c0 [ 1080.480119] [<ffffffff81172902>] ? user_path_at+0x62/0xa0 [ 1080.480122] [<ffffffff811663f1>] ? get_empty_filp+0xa1/0x170 [ 1080.480125] [<ffffffff812e6c47>] ? __strncpy_from_user+0x27/0x60 [ 1080.480128] [<ffffffff81180ea7>] ? alloc_fd+0xf7/0x150 [ 1080.480131] [<ffffffff8116425a>] do_sys_open+0x6a/0x150 [ 1080.480134] [<ffffffff81164360>] sys_open+0x20/0x30 [ 1080.480137] [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b [ 1080.480147] INFO: task dolphin:1842 blocked for more than 120 seconds. [ 1080.480148] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 1080.480150] dolphin D 0000000000000000 0 1842 1 0x00000004 [ 1080.480154] ffff8800cb4f3b38 0000000000000082 ffff8800cb4f3fd8 ffff8800cb4f2000 [ 1080.480157] 0000000000013d00 ffff8800cb7f4858 ffff8800cb4f3fd8 0000000000013d00 [ 1080.480161] ffffffff81a0b020 ffff8800cb7f44a0 ffffea000267b0d0 ffff88012704c870 [ 1080.480164] Call Trace: [ 1080.480168] [<ffffffff815c19f7>] __mutex_lock_slowpath+0xf7/0x180 [ 1080.480171] [<ffffffff815c144b>] mutex_lock+0x2b/0x50 [ 1080.480176] [<ffffffffa0d0ad42>] video_open+0x102/0x400 [cx8800] [ 1080.480179] [<ffffffff815c2cbe>] ? _raw_spin_lock+0xe/0x20 [ 1080.480181] [<ffffffff8117c55d>] ? __d_lookup+0x10d/0x170 [ 1080.480186] [<ffffffffa0ca0731>] v4l2_open+0x101/0x130 [videodev] [ 1080.480190] [<ffffffff81168f4a>] chrdev_open+0xda/0x1f0 [ 1080.480192] [<ffffffff81168e70>] ? chrdev_open+0x0/0x1f0 [ 1080.480195] [<ffffffff81162cee>] __dentry_open+0xce/0x2f0 [ 1080.480198] [<ffffffff8116ef33>] ? generic_permission+0x23/0xc0 [ 1080.480200] [<ffffffff811641e1>] nameidata_to_filp+0x71/0x80 [ 1080.480203] [<ffffffff811733c8>] finish_open+0xc8/0x1b0 [ 1080.480206] [<ffffffff811725b7>] ? do_path_lookup+0x87/0x160 [ 1080.480208] [<ffffffff81173b88>] do_filp_open+0x2c8/0x7c0 [ 1080.480211] [<ffffffff81172902>] ? user_path_at+0x62/0xa0 [ 1080.480214] [<ffffffff81131d4d>] ? handle_mm_fault+0x16d/0x250 [ 1080.480217] [<ffffffff812e6c47>] ? __strncpy_from_user+0x27/0x60 [ 1080.480220] [<ffffffff81180ea7>] ? alloc_fd+0xf7/0x150 [ 1080.480223] [<ffffffff8116425a>] do_sys_open+0x6a/0x150 [ 1080.480225] [<ffffffff81164360>] sys_open+0x20/0x30 [ 1080.480228] [<ffffffff8100c002>] system_call_fastpath+0x16/0x1b Attempts to kill the hung process are unsuccessful: root@deskpc:~# ps -ef |grep amarok myuser 2505 1 0 10:47 ? 00:00:00 /usr/bin/amarok root 2747 2020 0 11:06 pts/3 00:00:00 grep --color=auto amarok root@deskpc:~# kill -9 2505 root@deskpc:~# ps -ef |grep amarok myuser 2505 1 0 10:47 ? 00:00:00 /usr/bin/amarok root 2749 2020 0 11:06 pts/3 00:00:00 grep --color=auto amarok root@deskpc:~# kill -9 2505 root@deskpc:~# ps -ef |grep amarok myuser 2505 1 0 10:47 ? 00:00:00 /usr/bin/amarok root 2751 2020 0 11:06 pts/3 00:00:00 grep --color=auto amarok root@deskpc:~# When trying to access my external USB3 disk, the following kernel message is observed: [ 2169.330012] xhci_hcd 0000:06:00.0: Timeout while waiting for a slot [ 2169.330018] hub 3-0:1.0: couldn't allocate port 1 usb_device I am not sure the two problems (application hangs and USB3 timeouts are related) but they do not happen under Kubuntu 10.10. Judging by the dmesg messages, it looks to me that this is a kernel (or potentially kernel driver) problem, but not sure how to debug it. Any ideas? I ran apport-bug, but it advised me to post a question here first. Shall I report the issue on the official K/Ubuntu bugzilla?

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• Test-Driven Development with plain C: manage multiple modules

  - by Angelo

  I am new to test-driven development, but I'm loving it. There is, however, a main problem that prevents me from using it effectively. I work for embedded medical applications, plain C, with safety issues. Suppose you have module A that has a function A_function() that I want to test. This function call a function B_function, implemented in module B. I want to decouple the module so, as James Grenning teaches, I create a Mock module B that implements a mock version of B_function. However the day comes when I have to implement module B with the real version of B_function. Of course the two B_function can not live in the same executable, so I don't know how to have a unique "launcher" to test both modules. James Grenning way out is to replace, in module A, the call to B_function with a function pointer that can have the value of the mock or the real function according to the need. However I work in a team, and I can not justify this decision that would make no sense if it were not for the test, and no one asked me explicitly to use test-driven approach. Maybe the only way out is to generate different a executable for each module. Any smarter solution? Thank you

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• Proper way to encapsulate a Shader into different modules

  - by y7haar

  I am planning to build a Shader system which can be accessed through different components/modules in C++. Each component has its own functionality like transform-relevated stuff (handle the MVP matrix, ...), texture handler, light calculation, etc... So here's an example: I would like to display an object which has a texture and a toon shading material applied and it should be moveable. So I could write ONE shading program that handles all 3 functionalities and they are accessed through 3 different components (texture-handler, toon-shading, transform). This means I have to take care of feeding a GLSL shader with different uniforms/attributes. This implies to know all necessary uniform locations and attribute locations, that the GLSL shader owns. And it would also necessary to provide different algorithms to calculate the value for each input variable. Similar functions would be grouped together in one component. A possible way would be, to wrap all shaders in a own definition file written in JSON/XML and parse that file in C++ to get all input members and create and compile the resulting GLSL. But maybe there is another way that is not so complex? So I'm searching for a way to build a system like that, but I'm not sure yet which is the best approach.

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• 64-bit linux kernel only seeing 3 of 4GB after upgrade...

  - by Blaine

  Hey everyone. I am running Ubuntu 9.04 64-bit on my macbook. I had 2GB of ram before, and everything ran great. I just upgraded to 2x2GB (4GB), but my system only sees 3GB of it. OS X, which I am dual booting, sees all 4GB. Also, my video performance is incredibly lacking. Before the upgrade my compiz benchmark was full at 80fps, and now it is at 22fps with very choppy window dragging. Has anyone ever heard of this on a 64-bit kernel? I just don't quite understand what could be the issue. 10$ uname -a Linux macbook 2.6.28-15-generic #49-Ubuntu SMP Tue Aug 18 19:25:34 UTC 2009 x86_64 GNU/Linux $ free -m total used free shared buffers cached Mem: 2953 1031 1921 0 114 427 -/+ buffers/cache: 489 2463 Swap: 7812 0 7812 9$ lsmod Module Size Used by i915 77960 2 drm 123232 3 i915 binfmt_misc 18572 1 ppdev 16904 0 btusb 21784 2 bridge 63776 0 stp 11140 1 bridge bnep 22912 2 vboxnetadp 109356 0 vboxnetflt 116972 0 vboxdrv 1721612 1 vboxnetflt uvcvideo 69640 0 compat_ioctl32 18304 1 uvcvideo videodev 45184 2 uvcvideo,compat_ioctl32 v4l1_compat 23940 2 uvcvideo,videodev lp 19588 0 parport 49584 2 ppdev,lp snd_hda_intel 557492 3 snd_pcm_oss 52352 0 snd_mixer_oss 24960 1 snd_pcm_oss snd_pcm 99464 2 snd_hda_intel,snd_pcm_oss arc4 10240 2 snd_seq_dummy 11524 0 ecb 11392 2 snd_seq_oss 41984 0 snd_seq_midi 15744 0 snd_rawmidi 33920 1 snd_seq_midi snd_seq_midi_event 16512 2 snd_seq_oss,snd_seq_midi snd_seq 66272 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event ath9k 310584 0 snd_timer 34064 2 snd_pcm,snd_seq snd_seq_device 16276 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq mac80211 251528 1 ath9k iTCO_wdt 21712 0 iTCO_vendor_support 12420 1 iTCO_wdt joydev 20992 0 video 29204 0 snd 78920 15 snd_hda_intel,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device applesmc 37700 0 output 11648 1 video soundcore 16800 1 snd pcspkr 11136 0 cfg80211 43680 1 mac80211 appletouch 19972 0 isight_firmware 11520 0 input_polldev 12688 1 applesmc intel_agp 39408 1 snd_page_alloc 18704 2 snd_hda_intel,snd_pcm led_class 13064 2 ath9k,applesmc hid_apple 15872 0 usbhid 47040 0 ohci1394 42164 0 ieee1394 108288 1 ohci1394 sky2 63364 0 fbcon 49792 0 tileblit 11264 1 fbcon font 17024 1 fbcon bitblit 14464 1 fbcon softcursor 10368 1 bitblit Some information from dmesg: [ 795.820163] ACPI: EC: GPE storm detected, transactions will use polling mode [ 1762.709516] [drm:i915_getparam] *ERROR* Unknown parameter 6 [ 1763.078130] [drm:i915_getparam] *ERROR* Unknown parameter 6 [ 2362.760889] [drm:i915_getparam] *ERROR* Unknown parameter 6 [ 2416.352084] ACPI: EC: missing confirmations, switch off interrupt mode. [ 3718.721095] [drm:i915_getparam] *ERROR* Unknown parameter 6 [ 3719.108914] [drm:i915_getparam] *ERROR* Unknown parameter 6 [ 4318.773266] [drm:i915_getparam] *ERROR* Unknown parameter 6 [ 9513.813066] CE: hpet increasing min_delta_ns to 15000 nsec [ 9693.815684] npviewer.bin[6736]

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• Mac OSX: Passing a link to file from user process to kernel module.

  - by Inso Reiges

  Hello, I need to pass a link to file from a user process to the OSX kernel driver. By link i mean anything that uniquely identifies a file on the local filesystem. I need that link to do I/O on that file in kernel. The most obvious solution seems to pass a file name and use a VFS vnode lookup. However i noticed, that Apple Disk Images helper process passes a raw data array for image-path property to driver when attaching a disk image file: <2f 56 6f 6c 75 6d 65 73 2f 73 74 6f 72 61 67 65 2f 74 65 73 74 32 2e 64 6d 67> What is that diskimages-helper passes to the kernel driver? Some serialized type perhaps? If yes, what type is it and how can i use it?

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• Mac OSX: Passing a file from user process to kernel module.

  - by Inso Reiges

  Hello, I need to pass a link to file from a user process to the OSX kernel driver. By link i mean anything that uniquely identifies a file on the local filesystem. I need that link to do I/O on that file in kernel. The most obvious solution seems to pass a file name and use a VFS vnode lookup. However i noticed, that Apple Disk Images helper process passes a raw data array for image-path property to driver when attaching a disk image file: <2f 56 6f 6c 75 6d 65 73 2f 73 74 6f 72 61 67 65 2f 74 65 73 74 32 2e 64 6d 67> What is that diskimages-helper passes to the kernel driver? Some serialized type perhaps? If yes, what type is it and how can i use it?

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• Why do operating systems do low level stuff in C and C++? Why not just C++?

  - by Cole Johnson

  On the Wikipedia page for Windows, it states the Windows is written in Assembly for the bootloader and task switcher, and C and C++ for kernel routines. This confuses me because AFAIK, you can call C++ functions from an extern "C"'d block as C++ is just C with extra features (all of which can be rewritten in C if you wanted to AFAIK). I can get using C for the kernel functions so pure C apps can use them (like printf and such), but if they can just be wrapped in an extern "C " block, then why code in C? So my question is: Why would a kernel be written in both C and C++ instead of just C++

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• unseen/unknown function definition in linux source

  - by Broncha

  Can any one please explain this piece of code I found in the linux kernel source. I see a lots of code like this in linux and minix kernel but dont seem to find what it does (even if C compilers support that kind of function definition) /* IRQs are disabled and uidhash_lock is held upon function entry. * IRQ state (as stored in flags) is restored and uidhash_lock released * upon function exit. */ static void free_user(struct user_struct *up, unsigned long flags) __releases(&uidhash_lock) { uid_hash_remove(up); spin_unlock_irqrestore(&uidhash_lock, flags); key_put(up->uid_keyring); key_put(up->session_keyring); kmem_cache_free(uid_cachep, up); } I cannot find out if this reference __releases(&uidhash_lock) before the parenthesis starts is allowed OR supported. (It sure is supported as it is in the linux kernel)

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• I have neither grub.conf nur menu.lst

  - by chris

  Hi, I just compiled my own kernel for the first time. At it is written in a tutorial I now want to check whether the kernel got written into the grub.conf file. Well, I did not find a grub.conf file. So I googled. Answer: Ubuntu does not have grub.conf, but rather has a menu.lst (also stored in /boot/grub). So I looked for that file. But I don't have that one either. So now the question: Where is my GRUB data stored? Im using Ubuntu 10.10 with Kernel 2.6.35-27

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• Ubuntu 12.04 booting into busybox after update

  - by Victor Alejandro Martinez

  Every time the system updates the kernel from 3.5.0-24 to 3.5.0-34 I get dropped into a busybox prompt at boot, but I can boot just fine using the previous kernel. I've tried all I know. I did a fsck.ext3 -f /dev/sdb2 using the alternate install CD. I've used boot-repair but to avail, I've checked for bad blocks but there are none. Should I purge the new kernel and use the old one instead? This is the output from boot-repair the first time, no purge. http://paste.ubuntu.com/5809230/

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• Why ubuntu does not use the kernels installed by automatic update?

  - by Guillaume Coté

  I used the script describe in this question to list the kernel installed on the computer : How do I to remove or hide old kernel versions, to clean up the boot menu? In the 3.2.0, I have 33, 34, 35, 36, 37, 38, 39, 41, 43, 44, 45 and 48. I would expect to be running 3.2.0-48 after a reboot, but I am still running 3.2.0-32. Why the kernels installed by auto update are not used? [I am running 12.04 LTS] /boot/grub/menu.lst was modified for the last time June 16 2013, it contains 3.2.0-32-generic 2.6.32-45-generic 2.6.32-44-generic 2.6.32-43-generic A recovery for each of those and a memtest. I would have expected the kernel between 3.2.0-33 to 3.2.0-48 to be in this file before 3.2.0-32.

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• Package linux-headers-3.7.0-999 is not installed

  - by James Ward

  When trying to install the three amd64 debs for the 3.7.0 kernel from: http://kernel.ubuntu.com/~kernel-ppa/mainline/daily/2012-10-22-quantal/ I get this error: dpkg: dependency problems prevent configuration of linux-headers-3.7.0-999-generic: linux-headers-3.7.0-999-generic depends on linux-headers-3.7.0-999; however: Package linux-headers-3.7.0-999 is not installed. It installs and works correctly but leaves me with broken packages in Synaptic. Is this just a bug with how Ubuntu is packaging these latest debs? Or am I doing something wrong?

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• Samsung driver for notebooks in Natty?

  - by burli

  Hi, I have a Samsung N150 Netbook and I installed Unity 11.04 to make some tests. But some functions do not work like backlight and vertical scroll on the touchpad. There are drivers for samsung notbooks and I know that there is a PPA. But not for Natty. Will the drivers be avalible some day in the kernel by default? Will Canonical add these drivers in the kernel, if the Kernel developers wont? I think this would be very usefull because Unity is great for Netbooks and Samsung Netbooks are really nice.

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• Regular wireless dropouts on new lenovo T440s in Ubuntu 14.04

  - by user290670

  Over the last 24 hours my wireless has dropped out regularly. I've tested to make sure it isn't my router (my phone and everyone in the house isn't having problems using the wifi). This is a brand-new installation of Ubuntu 14.04 and according to uname I'm running kernel 3.13.0-24-generic. Now, my laptop has an Intel 7260AC dual band wireless card and I've read that Ubuntu has been having trouble with these. I notice that at http://www.intel.com/support/wireless/wlan/sb/CS-034398.htm There are some updated drivers for my kernel version. However I have no idea how to update the kernel to use these drivers instead so that I can see if this will fix it. Can anyone help? These dropouts are really annoying. EDIT: Upgrading to 3.14.6 did not help.

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• Are there similarities between operating system kernels and programming language kernels?

  - by rahmu

  I know very little about Smalltalk but I noticed that there's a frequent mention of the "kernel". Dan Ingalls prime maintainer of several implementations of Smalltalk also worked on a Javascript environment called "Lively Kernel" and in Peter Siebel's book he kept mentionning the "kernel". I cannot help but think that it is no coincidence that the creators of Smalltalk used the name of a (central) part of operating systems to refer to a particular component of their language. Was it because Smalltalk intended to act as an operating system? Was it because theory behind programming languages and operating systems have a lot in common? What is the reason behind the common appelation of the two components?

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• ec2 instance won't boot!

  - by TheToolBox

  So I had a server lose connection while updating to 14.04LTS. Foolishly, it ended up getting rebooted, and now I'm here. I disconnected the volume and mounted it on another system, chrooted it, and updated the kernel. Still no dice. Any idea what the problem could be? Thanks in advance! The instance log is below: ******************* BLKFRONT for device/vbd/2049 ********** backend at /local/domain/0/backend/vbd/3005/2049 Failed to read /local/domain/0/backend/vbd/3005/2049/feature-barrier. Failed to read /local/domain/0/backend/vbd/3005/2049/feature-flush-cache. 16777216 sectors of 512 bytes ************************** [H[J Booting 'Ubuntu 14.04 LTS, memtest86+' root (hd0) Filesystem type is ext2fs, using whole disk kernel /boot/memtest86+.bin ============= Init TPM Front ================ Tpmfront:Error Unable to read device/vtpm/0/backend-id during tpmfront initialization! error = ENOENT Tpmfront:Info Shutting down tpmfront xc: error: panic: xc_dom_core.c:621: xc_dom_find_loader: no loader found: Invalid kernel xc_dom_parse_image returned -1 close(3) Error 9: Unknown boot failure Press any key to continue...

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• Will Ubuntu be releasing an update for Cedar Trail Processors?

  - by Alan

  There is a file available on the Intel web site with the file name "cdv-gfx-drivers-1.0.1_bee.tar.bz2" and a date of July 6, 2012. It can be found by searching the Intel Download Center for the filename or the string "Linux* PowerVR Graphics/Media Drivers". The download page links to the file, release notes and a link, Enabling hardware accelerated playback that takes one to a page containing links to two pdf documents titled "Enabling Hardware Accelerated Playback for Intel® AtomTM Processor N2000/D2000 Series", one for Ubuntu and one for Fedora. The instruction and release notes speak to working with kernel 3.1.0 and since I do not feel I have the skills, knowledge or training to do anything else but, follow the instructions to the "T", I am very reluctant to try anything on my freshly updated 3.2.0 kernel. I would much rather use a Ubuntu supported kernel that applies these drivers and doesn't break anything in the process. Is it a case where this is so new that Canonical has not yet included these drivers but, soon will do so?

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• How do operating systems… run… without having an OS to run in?

  - by Plazmotech Binary

  I'm really curious right now. I'm a Python programmer, and this question just boggled me: You write an OS. How do you run it? It has to be run somehow, and that way is within another OS? How can an application run without being in an OS? How do you tell the computer to run, say, C, and execute these commands to the screen, if it doesn't have an OS to run in? Does it have to do with a UNIX kernel? If so, what is a Unix kernel, or a kernel in general? I'm sure OSes are more complicated than that, but how does it work?

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• Why is using an external USB drive or USB printer causing my system to hang?

  - by thepd

  I am having some troubles using various external hard drives and my printer, all of which I connect using USB. The majority of the time, when I connect either of these devices, my system freezes up completely after about 10 minutes. They work just fine prior to that moment. I've also not noticed any problems using a USB mouse. I'm running Ubuntu 10.10 and have tried using a newer kernel (a 2.6.36 Maverick kernel from the kernel ppa, as opposed to the default 2.6.35 one) to no avail. I'm using a Dell Studio XPS 16 (M1647) which is a sort of newish laptop and so my guess is this is probably some kind of driver bug. Is there anyway to debug these sorts of issues? I've looked through some of my logs (/var/log/messages seemed the most useful) but haven't been able to find any kind of USB related logging nor anything interesting happening prior to the hang.

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