Hardware :: Xset Does Not Turn Off Backlight?
Jul 25, 2009
Debian Lenny on a Toshiba Portege 350000:08.0 Bridge: ALi Corporation M7101 Power Management Controller [PMU]01:00.0 VGA compatible controller: Trident Microsystems CyberBlade XPAi1 (rev 82)kernel version 2.6.26-2-686On my system, "xset dpms force off" blanks the screen, but does not turn off the backlight. This means that the automated screen off in X does not actually save any power when it blanks the screen.I can turn off the backlight manually using the BIOS tool "vbetool dpms off" (but then I have to turn it back on again manually too).Question 1: is this a problem with the graphics driver interface, or with X, or with the power management driver interface?Question 2: as a workaround, is there any way for me to hook into the dpms off/on that X is doing, and run a script to call vbetool? The best workaround hack I have come across so far is to have a screensaver that calls vbetool, but I was hoping to find something that doesn't require me to run a daemon all the time.
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Dec 4, 2009
With keyboard : Illuminant model SK-020EL See next post for a workaround.
ETA : Code now works for my keyboard.
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Dec 17, 2010
unning 11.2 on laptop used as stationary desktop. Normally, the backlight turns off after several minutes of inactivity from keyboard/mouse. However, once video played using VLC, the screen simply blanks while backlight stays on, until system restart. Using Totem does not have this effect, but I like VLC.
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Apr 27, 2010
I have 2 Fedora 12 installs with this problem. Before installing FC 12, xset led 3 worked fine.
The command:
SHOULD turn on the scroll lock LED.
With FC 12, it doesn't.
In Xorg.log, I see: (WW) AllowEmptyInput is on, devices using drivers 'kbd', 'mouse' or 'vmmouse' will be disabled.
(I believe before FC12, I was using driver "kbd".) The man page for kbd shows the options needed for program control of the LEDs.
The new driver appears to be "evdev". I've read some of the HAL documentation and I think this driver uses the file: /usr/share/hal/fdi/policy/10osvendor/10-leds.fdi
I see nothing about program control in this file.
Anyway, anyone have any idea why xset led stopped working and how to go about fixing it?
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Jun 11, 2010
I use 'xset r 133' to set autorepeat for the 'Windows key'.
But somehow after a while autorepeat does not work any longer and I have to redo the 'xset r 133'. I don't log out or so.
Ubuntu 10.04, gnome, compiz
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Oct 30, 2010
I tried to log on to a remote computer using ssh, but I got an error:
xset: unable to open display
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Nov 19, 2009
I recently did a clean install of Fedora 11 (from Fedora 10). In Fedora 9 and 10 I used a remote font server so that I could launch HP OpenView over a VPN tunnel. The procedure would go something like this:
*connect to VPN
*xset +fp tcp/<hp_ux_server>:7000
*ssh -X user@hp_ux_server
*launch OpenView
OpenView requires the fonts that are installed on the HP-UX server, hence the need for the xset command. Now since the installation of Fedora 11, I cannot get the xset command to work.
xset fp+ tcp/<hp_ux_server>:7000
xset: bad font path element (#23), possible causes are:
Directory does not exist or has wrong permissions
Directory missing fonts.dir
Incorrect font server address or syntax
I have turned off the firewall to make sure it wasn't blocking the request. But to no avail. I have also had two other people with Fedora 11 machines try this, they get the same error. Were there major changes in the X server from Fedora 10 to 11+?
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May 16, 2011
The following script should make screen blanking work without disabling gnome-power-manager code...
This script can also be called from a panel launcher (with ./<scriptname> if it is in $HOME). It will not disable the power manager even though the process disappears from the system monitor. The "if" condition is necessary because SIGHUP will return an error if the process doesn't exist.
If you want a bash command, add this to $HOME/.bashrc:
# The following cannot be implemented as an alias
# and it cannot be called from a launcher, more's the pity
dark () code...
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Mar 31, 2010
ive installed ubuntu 10.4 beta on a toshiba a505-s6015 intell i5 processor and intel integrated graphics.it worked fine then the backlight went off.well i restarted it a couple of times and it wouldnt come back on.how do i fix this problem?
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Apr 28, 2011
The title says it all. I am using an Acer Aspire laptop that I upgraded from 10.10 to 11.04 today. There is no backlight. What's the fix?
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Jun 22, 2010
I have been given the task of installing CentOS 5.5 on some new Fujitsu Siemens S710 laptops and have the following problem. The OS seems to install without any issues but when it starts up you can see the login prompt just as the backlight is off on the laptop screen. If you were to plug in an external monitor it will work fine and the screen is perfect. The only thing I can think of is if the video drivers need to be updated but I can't seem to fine any Linux ones. It seems to use the Intel mobile HD graphics chipset.
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Aug 11, 2009
I just finished installing Fedora 11 and I'd love to love it but the issue is I can't see the screen without straining my eyes. So I bring to you almighty support forum a challenge: Need to enable the screen backlight. The laptop model is an Asus G50-X5
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Apr 25, 2011
On a couple of Linux laptops I have the built in screen never turns off it's backlight, regardless if a 'black screen' sort of screen saver is activated (this both for a laptop running an X-based desktop as well as for a laptop only having a text console) or if I even close the lid of the laptop (looking carefully in the dark, I can tell that the screen still has the backlight on, even if the laptop "know" it is closed).
This is a bad thing for a couple of reasons:
It wastes power
It generates heat which when the laptop lid is closed increases the cooling need (the fan goes on more often etc).
Backlights have limited lifetime like all electric components and IIRC, the less a backlight is turned on, the longer it will last. So, what is the best approach (considering a Gentoo with a 2.6.36 kernel) to remedy this? I recon that there probably are two approaches:
One for text-only laptops which never displays a desktop, e.g a laptop sitting there acting like a firewall or server
one for those running a Gnome/KDE/XFCE desktop (and a SLIM or GDM display manager).
The laptops I have in mind is a Dell Latitude CPi (built 1999, yes, it is from another millenea), a Compaq Armada M700 (built 2001) and a Dell Latitude D630. If this can be accomplished only by configuring things in the Linux OS (be it kernel setup or editing config files) without touching anything in BIOS, that would of course be preferable.
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Apr 13, 2010
I have an Asus K50IJ running Fedora(which I love as it fixed my sound problems). When I first log in, I can press the brightness keys and it responds immediately for 4-5 keypresses. After that, it has a ~10 second delay between me pressing the key and the computer responding. When using acpi_listen, it displayed that it recognizes the event long after I press the key. This is a pretty minor issue, but very annoying. Here's some possibly-relevant output from dmesg:
Code:
ata2.00: ACPI cmd ef/10:06:00:00:00:a0 (SET FEATURES) succeeded
ata2.00: ACPI cmd ef/10:03:00:00:00:a0 (SET FEATURES) filtered out
[code]....
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Nov 4, 2009
I have Ubuntu 9.04, and a HP laserjet 1018 printer.
I install the printer using:
And when it ask me about plugin I give the path to it. (the 3.9.2 version of the plugin, because Ubuntu 9.04 has the 3.9.2 version of hplip)
well I install the printer, everything works perfectly.....but, when I turn off the PC, and turn it on again, the printer does NOT work!, I send work for being printed but mothing happens , Ubuntu tells me that the job was printed but ... no case, my printer does not print it.
I have to install it again since cero. what can I don to stop install it every time I turn off the computer ?
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Jun 5, 2015
I have a note HP Pavilion 15-p171nr with Deban Wheezy installed
used X = Gnome (gdm3) in classic view
Hardware:
Code: Select allyaroslav@hpnote:~$ lspci -k | grep -E "VGA|3D"
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)
0a:00.0 3D controller: NVIDIA Corporation Device 1341 (rev a2)
yaroslav@hpnote:~$
[Code] .....
The problem: backlight is in maximum state and I can not change it.
There are a tons of advices like this:
1 - Open terminal (as a superuser) and type: gksudo gedit /etc/default/grub
2 - In the text file that opens, find the line which says GRUB_CMDLINE_LINUX="" and, inbetween the "", insert the words "acpi_backlight=vendor" (the line will be as follows: GRUB_CMDLINE_LINUX="acpi_backlight=vendor"), save and close the file.
3 - Back again in the terminal session, type: sudo update-grub
4 - Reboot.
It does not work...
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Oct 20, 2010
I have been running Squeeze for quite a while on my Asus W5F laptop, and recently I have started having intermittent issues with it not starting the backlight after returning from suspend/sleep. Most of the time, the screen comes on as it is supposed to, but once in a while the computer resumes but the backlight is off. It is not just turned down to the lowest brightness setting, it is all the way off. I can read the screen only if I take a flashlight and shine it on the screen and look very closely. Most of the time, it is just easier to go to another machine and use ssh to restart.
I'm not familiar with how the suspend/resume process works, so I don't really know where to look for configuration options. It seems like there are a number of different places, but how they work together, I don't know....
Neither the keyboard brightness adjustment nor echoing values to /proc/acpi/video/VGA/LCDD/brightness have any effect, though these do work to change the brightness when the backlight is on.
I took a look in /usr/lib/hal/scripts/linux/hal-system-power-suspend-linux, which shows the following options.
[ "$HAL_PROP_POWER_MANAGEMENT_QUIRK_S3_BIOS" = "true" ] && QUIRKS="$QUIRKS --quirk-s3-bios"
[ "$HAL_PROP_POWER_MANAGEMENT_QUIRK_S3_MODE" = "true" ] && QUIRKS="$QUIRKS --quirk-s3-mode"
[Code]....
The laptop is several years old and has had the lcd display replaced a year or two ago. It is possible that it is a hardware failure, but I lean away from that because a restart always brings the screen up fine, as does closing and opening the lid (which blacks the screen, no suspend).
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Jul 10, 2010
I'm writing a script to toggle LCD backlight on my laptop between minimum and previous/current level. I will then assign this script to a button. For this I need to be able to adjust backlight by using some command line utility. Also, this must be possible to be performed by a regular user.
What I have already tried:
1) The "xbacklight" utility. This didn't work. Program reported something like "no outputs found".
2) Used "acpitool -l <backlight_level>". This didn't work either.
3) The "echo -n 100 > /proc/acpi/video/VGA/LCD/brightness" works only when I am root. Changing permission of the file to allow writes by a user only valid until reboot. After reboot I need to change permission again, so this approach is not good either.
What works on my laptop, but with GUI:
1) Adjusting LCD brightness in "System->Preferences->Power Management" works.
2) Adjusting brightness with Gnome Brightness Applet works. However, after changing brightness with applet it says "Cannot get laptop panel brightness" and shows red crossed circle icon. Even after applet shows this message, it is possible to change the backlight level. It seems like the brightness level cannot be retrieved by the applet/system, but it can be set.
I can see that it is definitely possible to adjust LCD brightness through software because of the 2 things above, but how do I allow any user to change it from command line?
So, what are my other possible choices for changing backlight from command line?
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Mar 27, 2010
I am dual-booting Karmic/OS X. I have a MacBook Pro 5,1. When using the keyboard to change the backlight, the graphic in the top left does move to indicate a higher brightness (albeit, it moves extremely slowly).
I, of course, have all the necessary drivers installed.
I have all the packages I needed from the Mactel repository. This has been a problem within Karmic since I've put it on my MBP. There have been several updates from the Mactel repository concerning the Nvidia backlight package (I don't remember exactly what that package is called though). I hope each time that it will fix what is going on, but obviously, it hasn't.
Is there any program that I could use to otherwise change the backlight? When I'm sitting outside it's really difficult to see what's on my screen as it also doesn't automatically respond to the change in environmental brightness by making the screen brighter.
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May 5, 2010
I have an Asus P50IJ-X2 and in lucid the backlight cannot be adjusted. The panel app doesnt work, when I click on it and try to adjust the slider it just disappears. When I reopen it the slider is at the top left corner of the screen.
The function keys seem to be detected alright, but when I press them I get the notification that the brightness is going down but nothing happens. Also after the first press the notification gets extremely laggy. If I press the brightness keys again it takes 30 seconds or more for the notification to show up. Also after the first press my volume function keys have the same behaviour in the notification area as the function keys.
Also messing with the controls in the power settings doesn't do anything. The strange thing is all of this worked perfectly in Karmic. The function keys, auto dimming, everything just worked out of the box. I have no idea where to start trouble shooting this so can anyone give me some direction?
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May 30, 2010
Just upgraded to 10.04. Everything seems to still work on my Macbook, with a bonus being the buttons to modify the keyboard backlight brightness seem to work now.
However, the only caveat is that I can't seem to turn off the backlight. Pressing the dim button all the way to off just seems to reset to full brightness. Even if I set the brightness to 1 (almost off), the backlight seems to reset itself to full brightness at seemingly random times.
Running this command used to turn it off, but now doesn't work:
Code:
echo 0 | sudo tee -a /sys/class/leds/smc::kbd_backlight/brightness
Is this a bug? How do I turn off the keyboard backlight?
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Jun 18, 2010
Fn + brightness-rightness+ = shows notification about brightness status (50%), but does not control the intensity of backlight. it's just stuck on 50% and that's all.
Ubuntu 10.04 x64,
notebook vaio vgn-nw21mf.
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Sep 3, 2010
I am doing a project that involves dimming monitor backlight and Im in the process of searching a PC to be used for the project.
I ran ubuntu live cd in a PC shop to see if I can use the ff command: echo 30 > /proc/acpi/video/xxx/xxx/brightness
However, all brightness files just contain <not supported>. Is there another way to adjust the brightness (not using buttons)?
Since the monitor is dimming when idle (through built in power management), is it safe to assume that there is a way to do this?
I already need to confirm if we would order the PC. PC is Asus ET1610PT (all-in-one PC, touchscreen monitor)
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Dec 23, 2010
After upgrading to Mythbuntu 10.10 from 9.10 (clean install) on my combined front/backend I cannot get monitor (Dell 3007) to switch off from remote, I have been using simple script to DPMS force off for years with no problems, it still works, but some random time later the backlight comes back on. I have tryed the more complex scripts that stop and start the frontend and all of the acpi_osi options. Disabling screensaver has no effect. what causes this, or how to fix? Sysem is Abit IP35e (I suspect this board is the problem)
[Code]...
I have 2 remote frontends both upgraded OK. I have tryed installing 10.10 on a 'scrap' P4 machine, DPMS off works fine on it. I would try another install and/or another MoBo but its the only TV system in the house now.
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Feb 24, 2011
I've finished integrating proper keyboard backlight support into gnome-power-manager (which in turn uses upower to actually control the keyboard backlight) which with any luck will be available in Natty out of the box. A similar patch should also land upstream too so Fedora etc should get it for free too in their next release too. In essence this allows us to provide the user with greater feedback and control than say just using pommed (ie. we can dim the keyboard on idle like the lcd display etc, and can display nice notifications of the keyboard backlight level too - see attached screenshot).
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Jan 1, 2010
The title pretty much describes the issue. The timespan is sometimes some minutes instead of some seconds. I've tried unplugging every peripherials and disabling the touchpad, killing every non-critical processes, disabling and enabling Compiz, but nothing has helped so far.
I'm running Karmic on an Acer Aspire 8935G-874G100BN laptop with a Radeon graphics chipset.
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May 4, 2010
I recently upgraded to 10.04 Lucid. Before I had the command "xset led 3" mapped to my scroll lock button. This turned on the SunbeamTech Illuminated Keyboard. Now it does nothing even when typing it into the terminal. Has anyone had this problem after upgrading?
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Mar 21, 2015
This error happened when i booted my system :
Failed to start Load/Save Screen Backlight Brightness of backlight:acpi_video0. See systemctl status systemd-backlight@backlight:acpi_video0.service' for details.
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Jan 3, 2011
I have a Toshiba A665-S6092. Core i7 CPU and I installed a Kingston SSD so it's up to the job. It supposedly has keyboard backlight but I can't figure out how to get that function functioning. Now, I know this ain't real important but I have a feeling other people might like to have that too so I'm asking. Does anybody in Fedora Land have any experience getting Toshiba keyboard backlight working? Maybe I'm wrong about it having this option, I can't find any mention of it using all the tools at my disposal. lspci, the Gnome device lister, xorg keyboard config, etc. Apparently everything except the right thing. I've Googled until I'm Googleyed and searched this forum and LinuxQuestions.org (which seems to have been hijacked by Slackware fanatics over the last few years) and other forums like JustLinux, Linux.com. I can't remember them all. I've looked through source code that I could make no sense of and wondered why I was pretending to be qualified to do that until I realized how important this has become to me, although it is as I said a relatively trivial matter. If anybody knows and wants additional information I'll be more than happy to supply it. I'm running the default kernel for Fedora 14 64 bit, 2.6.35.6-45.fc14.x86_64.
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Jul 6, 2010
On Windows I use software called SpeedFan to turn off a fan that does a whole lot of noise but has no effect on system temperature.
How do I go about turning it off on Ubuntu (Lucid Lynx)? Wine does not support this program.
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