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  • Thinking about buying a LG 30" monitor

    - by evan
    I'd love to get http://www.newegg.com/Product/Product.aspx?Item=N82E16824005115 but I'm wondering if I should hold out until more LED monitors are on the market. I love really like the brightness of the 27" imac monitor and the above monitor is only rated at 5 cd/m2 less than that monitor, but wouldn't a back lit monitor appear to be much brighter than an LCD monitor? Does anyone know how the above monitor compares to the 27" imac monitor? Why are Apple monitors in general so much more expensive than other monitors - just the brand name? I must be confused about how to read the specs? Thanks in advance for your input!

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  • Can you disable the light up buttons on the HP HDX series laptops?

    - by Connor W
    Im intrested in buying a laptop from the HP HDX series, but I have one concern. As you can see below, they have touch sensitive buttons above the keyboard which are lit up. I cant help but think how distracting they would be if you were watching a film on it. So does anyone know if its possible to turn these lights off? And to any owners of this laptop, do you find it distracting? Thanks

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  • How to find out if the screen is WLED or RGBLED on Dell Studio XPS 16?

    - by Abhijeet
    I just ordered the Dell Studio XPS 16 with i7 and 16" RGBLED screen. This upgrade from WLED LCD to RGBLED LCD charged me more $$. But now when I view the order online, it lists this part as "320-8335 Premium FHD WLED Display, Obsidian Black, 2.0 MP Webcam". When called Dell, the rep says this part is RGBLED screen and the "premium" is for RGBLED. I want to make sure they are shipping me the RGBLED screen and not the WLED. Is there any way to verify this after I receive (either from Device Manager or BIOS or somewhere in system settings)? Also, is there any published specifications / criteria that we can run (some third party software) on this monitor which can tell if this is WLED or RGBLED?

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  • Ubuntu 11.10 - can't adjust brightness on my laptop

    - by Danny
    Using every method possible I'm unable to change my laptop brightness.. It's stuck on super max brightness.. Using the slider in the "screens" window int he control panel doesnt do anything, and using the fn keys doesn't do anything... Some info about my system: laptop is a MSI VR420 Running ubuntu 11.10 video card is an integrated intel card Used to work when I ran ubuntu 10.10 and earlier versions (not sure if it worked out of the box or if I inadvertly fixed it in previous versions while installing lots of other packages) Brightness slider on the "screen" window doesn't do anything, "dim when on battery -power" doesnt do anything When I use the fn+f4/f5 keys to adjust brightness there is a popup showing that its receving the input, but i can only go from between 0 brightness and max brightness.. (that is what the output is showing, the brightness does not change though) when attempting to change the brightness with fn+f4/f5 my dmesg log reports "ACPI: Failed to switch the brightness" Here are some outputs from some terminal commands, not sure if any of this is useful or not.. lspci - http://pastebin.com/EimZSGs3 "ls /sys/class/backlight/*/brightness" will output "/sys/class/backlight/intel_backlight/brightness" "cat /sys/class/backlight/intel_backlight/brightness" = 0 (when I use the fn+f4/f5) this will change betwene 0 and, but the actual brightness doesn't change) "cat /sys/class/backlight/intel_backlight/max_brightness" = 1 "lsmod | grep ^i915" = i915 505108 3 here is the list of things I've tried through searching google..... Edit /etc/default/grub?GRUB_CMDLINE_LINUX_DEFAULT: acpi_osi=Linux, acpi_backlight=vendor, nomodeset. (as well as several different combinations of these settings being on or off) Edit /etc/X11/xorg.conf (file doesn't exist on my system) Edit /proc/acpi/video/VGA/LCD/brightness (file doesn't exist) sudo setpci -s 00:02.0 F4.B=XX (does nothing) xbacklight -set XX (does nothing) I've tried about everything with no luck... The only thing i haven't tried is adding the ppa that someone suggested here: Unable to change brightness in a Lenovo laptop .... However according to the notes on the ppa.. all of the changes that are in the ppa are now actually apart of 11.10 and the ppa is only for people with 11.04.. Does anyone have any ideas for me? edit:by setting acpi=off in my /etc/default/grub file I was about to get my fn+f4/f5 keys to work, also "dim when display to save power" now makes my laptop dim when on battery power.. the dimness slider however still doesn't do anything.. also xbacklight doesn't do anything stil or any of the other methods... The thing i don't get is why setting acpi=off makes my fn+f4/f5 keys work? Isn't acpi supposed to be enables the backlight to be dimmed? does anyone know what ubuntu is deciding to do behind the scenes when acpi=off? Does anyone know what/if any features I might be losing with it off?

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  • Thinkpad brightness steps error using FN+Home/End

    - by petermolnar
    I've met the following problem: normally my T400 (Lenovo Thinkpad) has 16 steps of brightness, and Windows utilizes it correctly. After a fresh install & minor tweaks Mint 12 (which is based on 11.10 Ubuntu) I only had 6 steps which was way to few. Listing /sys/class/backlight showed 3 entried. I removed the acpi-tools package, one of the disapperared - and I now have 10 steps! Therefore I think if I can reduce the entries to 1 I'm going to have 16 steps, since the stepping will be 1 instead of 2 (or 3). /sys/class/backlight/ intel_backlight -> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight thinkpad_screen -> ../../devices/virtual/backlight/thinkpad_screen The problem is that I'm unable to trace back what are the configs / daemons / kernel options triggers these two. More strangely, I discovered a strange behaviour. I monitored watch -n1 "cat /sys/class/backlight/thinkpad_screen/actual_brightness" and watch -n1 "cat /sys/class/backlight/intel_backlight/actual_brightness" while changing the brightness with FN+home/end combinations from max to min. The outcome is the following: brighness intel thinkpad --------- ----- -------- MAX 2408475 7 | 1955115 5 | 1435640 3 | 1246740 1 | 1086175 0 | 1010615 6 | 859495 4 | 689485 2 v 481695 0 MIN 217235 0 brighness intel thinkpad --------- ----- -------- MIN 217235 0 | 481695 2 | 689485 4 | 859495 6 | 1010615 7 | 1086175 1 | 1246740 3 | 1435640 5 v 1955115 7 MAX 2408475 0 When stepping from MIN to MAX, there's no difference between the last 2 steps. Also, the OSD icon (Cinnamon desktop, default theme) goes from full to min in 4 steps and from full to min once again in 4 steps. So... it seems that the intel entry is working correctly, showing correct values. The thinkpad entry however twists the things and even showing incorrect values. Does anyone have any idea how to get rid of the thinkpad entry? System data: Linux Mint 12 3.0.0-16 kernel Lenovo ThinkPad T400 Cinnamon 1.4 desktop For any additional info, please tell me what do you need. EDIT I'm sorry, I forgot to mention, I added acpi_backlight=vendor to GRUB cmdline as well, this is the result of the semi-better working than the default.

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  • How can i make Brightness Control work?

    - by Semen
    I have Xubuntu 12.04 with latest updates on Toshiba Satellite A210-15K laptop semen@bloknot:~$ uname -a Linux bloknot 3.2.0-24-generic #37-Ubuntu SMP Wed Apr 25 08:43:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux ...and I can't adjust LCD brightness (. I tried to use fnfx tool: semen@bloknot:~$ fnfx-client FnFX Client v0.3 (c) 2003, 2004 Timo Hoenig <[email protected]> fatal error: Could not open "/home/semen/.fnfxrc". Please make sure that the default config is accessible. ...and xbacklight: semen@bloknot:~$ xbacklight No outputs have backlight property ...and I tried to add acpi_osi=Linux and acpi_backlight=vendor parameters in GRUB config, but nothing happens. I soppose .fnfxrc file must be available after installation or first fnfx demon lauch. Isn't it? semen@bloknot:~$ cat /sys/class/backlight/toshiba/brightness -5 semen@bloknot:~$ cat /sys/class/backlight/toshiba/max_brightness 7 semen@bloknot:~$ echo 6 | sudo tee /sys/class/backlight/toshiba/brightness [sudo] password for semen: 6 ... ...but brightness is the same. Help, please. P.S. Execuse me for my poor English. UPD. I have spent 2 days to solve this boring problem, but I can't. So. If I wish linux work correctly, I have to choose another distro.

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  • Backlit keyboard on Toshiba Satellite P755-S5184 doesn't work in Ubuntu 12.04

    - by chrisabner23
    I have the keyboard backlight turned on in bios to timer setting (1 second). When laptop boots the backlight works, but once ubuntu begins to load the backlights turn off. There is a function key combo that is supposed to turn it on (Fn +Z), hitting that brings up a notification balloon showing the backlit keyboard icon but it is grayed out. I tried using KeyTouch to try and get the backlight working but my laptop model isn't on the list. I'm new to Ubuntu, and have been searching the web and can't seem to find any answers that will work for my particular situation. Any information would be MUCH appreciated. Thanks!

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  • Brightness fn key adjustment problems

    - by npCoder
    My brightness function key controls work after setting grub boot parameter to "acpi_osi=" but using them I cannot adjust the brightness higher than around 70% (there is empty bar left over and I can't adjust higher) unless I go to Brightness & Lock settings manually than I can use the slider to adjust it higher... I primarily use intel_backlight to adjust my backlight and I am running Linux kernel 3.14.1 on Ubuntu 14.04 LTS on an ASUS X550LA Laptop when I try: cd /sys/class/backlight/intel_backlight cat max_brightness 937 cat brightness 811 It seems that I can only adjust to a maximum of 811 using the fn brightness controls If I instead do cd /sys/class/backlight/acpi_video0 cat max_brightness 10 cat brightness 4 cat actual_brightness 10 With the FN keys actual_brightness is not equal to the value returned from brightness on acip_video0 (which is always 4) but on intel_backlight actual_brightness = brightness The adjustment problem seemingly arises because both intel_backlight and acpi_video0 are trying to adjust brightness

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  • tring to edit brightness

    - by Martin Mobbs
    i'm tring to edit the /sys/class/backlight/max_brightness file to stop ubuntu 12 returning to maximum brightness on each reboot. gedit won't save the file after i have modified it i have used chown to change ownership to me which was successful. I then changed gedits settings so it won't save a backup but it still won't save. It returns with this error, Could not save the file /sys/class/backlight/acpi_video0/max_brightness. Unexpected error: Error writing to file: Input/output error is this yet another bug?

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  • Make sudoers work with only certain parameter?

    - by Evan
    I'm trying to make my sudoers file allow a user to adjust the backlight without having to enter in the password. This is what I have: # User alias specification Cmnd_Alias ADJBL = /usr/bin/su -c "echo 150 >/sys/class/backlight/intel_backlight/brightness" # For our user.. ouruser HOME=(root) NOPASSWD:ADJBL .. but it doesn't seem to be working, I still get prompted for the password when I try and run that command with sudo. Apparently there is something I'm missing here, any ideas?

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  • Iverter, inverter cable, or a display cable?

    - by krebshack
    I was recently hired at a small repair shop. I work indoors while my boss does on site calls for small businesses. I have to troubleshoot and fix laptop screens a few times a week and this is why I'm posting this question. I'm having trouble figuring out how to stream line the troubleshooting process. For example, how do I determine whether the inverter is broken while also determining that the inverter cable is not. How can I quickly decide that the inverter cable is broken while knowing that the inverter is most likely not broke. Or how do I know that it's just the display cable? It seems like this is a good way to approach things: "It could be the inverter, backlight, or the LCD panel itself. Backlight failure is usually hinted at by a pink hue to everything. Inverter failure usually results in the dimming of images on the screen to the point where the backlight is not even on (the inverter provides power to the backlight)" Source. While remembering that things "like flickering, screen freeze in dark image and [a] corner starts to get brighter" point to a "failure in the LCD panel itself, though it could just as easily be a loose data cable connected to the back of the LCD." Source. In short, I'm soliciting advice that anyone might have on how to quickly make the best decision about what's causing problems with laptops display. Thank you.

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  • Can I fine-tune my screen brightness? (Ubuntu Studio, Thinkpad T420s)

    - by Dan S
    I am in a similar situation as question Can I fine-tune my screen brightness? . For me, Thinkpad T420s and Ubuntu Studio 11.10. The brightness keys work fine but the increments are too large. I have the /sys/class/backlight/acpi_video0 and I can see the value of actual_brightness changing as I use the brightness keys - it changes between values 0,3,6,9,12,15. None of the listed answers for fine control works here, as follows: As the root user I can echo integers to brightness in the above folder. As an ordinary user I cannot. I do not have /usr/sbin/gnome-power-backlight-helper (because I'm using xfce perhaps?), and not sure what package it's from or if installing such a package would make sense since it's not what's currently managing the backlight. How can it be done, please?

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  • How do I get wireless and video working on a Sony Vaio vpc-z21x9r

    - by Alex
    OS: Ubuntu 11.10 Kernel: 2.6.37.6 Laptop: sony vaio vpc-z21x9r The problem: I can't change level of screen backlight; also can't enable wi-fi. While using 3.0 kernel everything is ok, but the laptop discharges too quickly. Results for lspci 02:00.0 Network controller: Intel Corporation Centrino Wireless-N + WiMAX 6150 (rev 5f) VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) there is no wlan0 in ifconfig -a too. I've fount that kernel should already have drivers for this graphics controller, but when i load up in restore mode, it writes "fall" while trying to load up some video drivers. To change the level of backlight i've alrady tried: xbacklight -set XX , smartdimmer -s XX and got this init_ nvclock() failed! also sudo setpci -s 00:02.0 F4.B=XX with no results. As for wi-fi, i've found driver but i don't understand how to install it. Here it is How can I fix these problems? Thank you for your help and time! Also tried to fix problems with backlight writing GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor Still no results. Is there any sense in recompiling kernel, I mean 2.6.37.6. Can it make any improvements in the situation?

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  • 12.10 upgrade broke brightness keys [closed]

    - by Chris Morgan
    I have been running Ubuntu (64-bit) on my HP 6710b laptop (Core 2 Duo with integrated graphics) for several years, and the backlight brightness keys have always worked. Since I upgraded to Ubuntu 12.10 earlier today, those keys do not work any more. The secondary function keys: Fn+F3: sleep; still works (and considerably faster than ever before!) Fn+F8: battery info; still works Fn+F9: reduce brightness; stopped working in 12.10 Fn+F10: increase brightness; stopped working in 12.10 It may also be worth while mentioning that X does not appear to be receiving the brightness events at all, or at least not sending them out further. (This I detected with a key logger I wrote for a Uni project, which uses X's Record extension; it is informed of the sleep and battery info keystrokes, but doesn't receive the brightness ones at all.) In the mean time, I know that I can use the Brightness & Lock settings screen to alter the brightness. (Wow! I can suddenly make my backlight darker than I could before—I can go right down to turning the backlight off, something I couldn't do before... but this model has a fairly dim screen, so I don't expect to use that much, if ever.) How can I get the brightness keys working again? This question is probably strongly related to I can't control my Brightness in HP Compaq 6710s.

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  • How do I add more than one command to /etc/rc.local?

    - by Andreas
    I want to add two power saving commands to /etc/rc.local file. This to dissable bluetooth: rfkill block bluetooth And this to reduce screen brightness: echo 3024 > /sys/class/backlight/intel_backlight/brightness Separately added to /etc/rc.local they work but not both of them together like this: #/bin/sh -e # # rc.local # # This script is executed at the end of each multiuser runlevel. # Make sure that the script will "exit 0" on success or any other # value on error. # # In order to enable or disable this script just change the execution # bits. # # By default this script does nothing. echo 3024 > /sys/class/backlight/intel_backlight/brightness rfkill block bluetooth exit 0 How do I add the two commands to get them properly executed at start-up? Update It turned out to be a timing issue. I fixed it by delaying the execution of the first command thus: (sleep 5; echo 3021 > /sys/class/backlight/intel_backlight/brightness)&

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  • Laptop LCD sometimes stops working on reboot. Please help.

    - by J Ringle
    I have a Gateway P-6831FX Laptop with Vista Ultimate. The Laptop LCD will sometimes not come on after I reboot the computer. I don't even close the lid and it happens. It isn't dim, it doesn't come on at all. No posting of CMOS (BIOS), nothing. Please note... this happens sometimes, not every time. Frustrating! When plugged into an external monitor, which works fine, Vista display properties can't even "sense" the laptop LCD. I try to enable the laptop LCD for dual display, turning on the laptop LCD, and it does nothing. It's like the laptop LCD is not even there. Manually taking a magnet in my hand to the laptop lid sensing switch (the sensor that turns off display/sleep mode when you close lid), sometimes causes the LCD backlight to "turn on" but not display any images. By "turn on" I mean I can see the screen backlight turn on to a 'dark gray' screen instead of pitch black. Subsequent reboot the laptop display is not working again! Here are the facts: Only happens at random and only after a reboot. Waking from Sleep mode isn't a problem. Pressing F4 function key for dual display does nothing when this happens. Closing lid doesn't seem to be related. (unless it is only after reboot.) using external magnet from laptop screen sensor sometimes triggers backlight to turn on but reboot back to square one with no LCD display. an external display always works fine. I have taken apart LCD, checked all wires and ribbons for loose connections or damage. I have replaced the Inverter. It doesn't seem to be heat related as I can put in sleep mode and resume fine when very hot. (external monitor works fine too). Sometimes the screen works fine as if there is not a problem at all. Even after a reboot... This is random. Any ideas out there? If it is a bad part... which one? The LCD seems to be fine. What are the odds of 2 bad inverters? The backlight is fine. The LCD wires/ribbons seem to be fine. I am at a loss. No warranty left and Gateway tech support is clueless. Thanks for any feedback that might help.

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  • Ubuntu 11.10 on MacBook Air 2011 - problems with drivers

    - by RankoR
    I had just installed Ubuntu 11.10 on my MacBook Air, and have a lot of problems. I used this tutorial, after executing script and rebooting some problems were solved, but now I have completely not working touchpad, keyboard & screen backlight works incorrect (screen brightness is not 100%, but it is 100% in settings, keyboard backlight turns on/off randomly). How to fix it? P. S. Script said that it's no such file or directory for some .icc file. Google says, that I should copy it from Mac OS X drive, but I completely replaced it with Ubuntu.

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  • MacBook Pro 5.5 32-bit or 64-bit 12.04 LTS

    - by Barkerto
    I'm currently running Ubuntu 12.04 LTS 64-bit on a Macbook Pro 5.5. I'm dealing with a couple of issues with the backlight and other little pesky things which with my understanding could be caused by the silly Mac, or just a brand new LTS, or both. Is it known for macs running ubuntu to run better with the 64-bit or 32-bit? I know that the bit size deals with info transfer, but I'm just curious if the versions react differently with the macs cpu and hardware (for example if I switch to 32-bit would the backlight issue be resolved) and resulting in a better user experience. =) thanks in advance

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  • Brightness is reset to Maximum on every Restart

    - by Bhargav
    The brightness of my laptop is reset to Max on every restart. I tried the solution provided at this website but had no luck. http://ubuntuguide.net/how-to-save-screen-brightness-settings-in-ubuntu-12-04-laptop/ This command cat /sys/class/backlight/acpi_video0/max_brightness Returns cat: /sys/class/backlight/acpi_video0/max_brightness: No such file or directory Then I go on to find that I don't have any folder named acpi_video0 but a folder called intel_backlight Every time I increase or decrease the brightness using the Brightness Control Keys the "brightness" and the "actual_brightness" values get updated. Is there any method I could follow to set the brightness to a fixed value on everyboot and vary it as and when I need it using the Brightness Control Keys.

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  • Macbook Pro late 2011 screen brightness issue

    - by buchzumlesen
    The keys to set the screen brightness work properly but everytime I reboot, the screen brightness is reverted to 100%, which is very annoying. I've already tried to add the following lines to /etc/rc.local but with no success (only the keyboard backlight stays off): #!/bin/sh -e # # rc.local # # This script is executed at the end of each multiuser runlevel. # Make sure that the script will "exit 0" on success or any other # value on error. # # In order to enable or disable this script just change the execution # bits. # # By default this script does nothing. echo '1' > /sys/devices/platform/applesmc.768/leds/smc::kbd_backlight/brightness echo '6' > /sys/class/backlight/acpi_video0/brightness rfkill block bluetooth exit 0` This worked for me when I was using Ubuntu 12.04 and also did after the upgrade to 12.10 but then after rebooting the screen brightness always reverted to 100%. Would be nice if anyone knows how to fix this. My device: Macbook Pro 13" Late 2011 Thanks in advance!

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  • Control external monitor brightness

    - by remi
    Hello Ubuntu community, I can control the brightness of my DELL U2713HM connected with DisplayPort via the command: ddccontrol -p -r 0x10 -w 53 where in this example the number 53 represents the brightness level (range 0 to 100). But I don't know how to link the command to my brightness keys on my keyboard. I searched already, but just found answers to integrated laptop screens. In /sys/class/backlight is the folder acpi_video0 with some subfolders and files. The file actual_brightness contains a number from 0 to 20, which is changing when I press the brightness keys. How do I get my external monitor listed as a device in /sys/class/backlight ? PS: I am running a fresh Ubuntu 12.10 install with integrated graphics Intel HD4000.

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