Hardware :: Backlight Keys Slow To Respond?
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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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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Mar 17, 2010
my 9.04 64 bit ubuntu machine is having some major stuttering issue, as in it can't stay on track and doesn't respond to keys at certain times, the normal flashing text bar is flashing very quickly and very eradically as well. I reinstalled ubuntu keeping my /home on a separate partition, and then upgraded to 9.10 thinking that'd fix it, it didn't.at this point i don't know what's happening, My windows partition is fine.
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Jul 23, 2014
Yesterday something has happened with power supply, so 2 of 3 PCs has shut down. And now my debian pc doesn't respond to multimedia (volume to be precise) keys, leds also doesn't work. Other keys are fine. Tried xev, but it doesn't respond to multimedia keys either. I have dual boot with Win7 on this machine, and it works fine with multimedia keys.
I believe this is a clue:
Code: Select all[Â Â 22.324109] generic-usb: probe of 0003:04D9:1702.0004 failed with error -110
uname -a:
Code: Select allLinux sharlin 3.2.0-4-amd64 #1 SMP Debian 3.2.60-1+deb7u1 x86_64 GNU/Linux
dmesg:
Code: Select all[Â Â 0.000000] Initializing cgroup subsys cpuset
[Â Â 0.000000] Initializing cgroup subsys cpu
[Â Â 0.000000] Linux version 3.2.0-4-amd64 (debian-kernel@lists.debian.org) (gcc version 4.6.3 (Debian 4.6.3-14) ) #1 SMP Debian 3.2.60-1+deb7u1
[Â Â 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.2.0-4-amd64 root=UUID=57fa72ea-ce79-4da0-a74d-2ffee8573437 ro quiet
[Â Â 0.000000] BIOS-provided physical RAM map:
[Code] ....
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Nov 16, 2010
I have CentOS 5.5 x86_64 with Apache, php and mysql.
I have just installed OTRS (helpdesk - trouble ticket system) on that server and no users.
This system works with perl, apache and mysql.
I notice that is slow to respond and at times unresponsive the apache welcome page. code...
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Jan 28, 2010
every time when I run "su", it takes about 10 seconds to respond, and the same for "exit".meanwhile, "/var/log/syslog" was added something like this:
Code:
Jan 28 15:32:48 Korhal kernel: ata5.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x0
[code]....
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Apr 17, 2010
I don't know if this is a configuration issue or a hardware issue, but I have a Kinesis Advantage USB keyboard and for some reason the F3-F5 keys aren't responding as they used to. They don't respond to anything and, when I tried using F5 on Emacs, it said <XF86AudioNext> is undefined, so I guess it's a weird mapping problem.
Any idea how I could remap them to the original meaning?
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Jun 27, 2011
Just wondering if Ubuntu has an Accessibility equivalent for sticky keys and mouse keys.
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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 7, 2011
I'm running Debian (Squeeze) and I have a toshiba portege m700. It has five buttons on the front just under the screen, which are the only ones accessible when you flip the screen over into tablet mode. One of them is for rotating the screen, and another is for switching to external display. I want to remap the remaining three to control, alt and super so that I can use shortcuts with the stylusThe problem is, when I used showkey to find out the key codes, I found out that each button generates more than one key code:Button 1:
key 126 press >> super_r, although this is distinct from the actual super key (125)
key 7 press >> 6
key 7 release
key 126 release
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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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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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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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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 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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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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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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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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May 26, 2010
the Lucid Lynx - released in April 2010 I acedentally pull my scool folder into Trashï (i think the folder is 5 gb or omething.)i haven't empty my trash yet. But now i cant open trash, i press the Trash icon and then the window comes up, and then it does not respond?d to get in root but i cant get permissions. I have tried some ways in the terminal tget root permissions, i have password, but i still cant came inRoot
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Sep 6, 2010
Some days ago (Sep 2?) I did a 'yum update' on a F13 64bit computer. Since then I don't get a logon screen when booting. The computer doesn't respond to CTRL-ALT-F2 but I can login over ssh.
CAPS-LOCK and NUM-LOCK don't work on the local keyboard and moving the mouse has no effect either. When looking in dmesg I see following line:
INFO: task Xorg:1850 blocked for more than 120 seconds.
Xorg.0.log attached.
I didn't touch xorg.conf when this happened.
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