Debian Hardware :: Backlight Occasionally Not Turning On After Suspend?
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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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 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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Feb 25, 2011
My monitor keeps flickering every now and then, i happens more than a couple of times in a day. I have Debian Squeeze installed, the system is updated.
Below is the relevant o/p from lspci -v
Code:
$lspci -v
00:02.0 VGA compatible controller: Intel Corporation 82G33/G31 Express Integrated Graphics Controller (rev 0a) (prog-if 00 [VGA controller])
Subsystem: Dell Device 0294
[Code]....
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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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Jun 24, 2015
I've been having trouble with rendering issues in Gnome for the past few weeks, running Sid on x86_64, Occasionally Blue and Grey horizontal bars show up, they go away partially if I scroll up or down, and the bars disappear completely if the window is resized. Select characters/letters will also occasionally become garbled, if I change the font in Gnome Tweak Tool it seems to temporarily fix the issue though.
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Jan 2, 2011
I have posted questions on several Linux forums that asked how I could turn off the touchpad on my new EEE-900A netbook. There is a backstory that is not that relevant, but in a nutshell, I got this tiny low-power computer to be my voice since my speech is impaired. Only the latest Debian has the tools I needed.
After much searching, suggested that I remove the touchpad driver; the command as root: # rmmod psmouse
Did the trick. On the 900A, the protocol that handles the touchpad is the PS/2. Removing the psmouse driver module does not affect my USB mouse, so now I can use my USB mouse and type away with my left hand and bumping into the touchpad doesn't screw things up. In other words: Success. (I am being as explicit as possible so that all search engines will find this.
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Jul 21, 2011
I am thinking to turn a pretty old Mac Mini with 1.42Ghz PowerPC to Debian. Any thing I should be aware of?
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Jul 6, 2015
I have an Aspire One ZG5, Stretch/Sid, fully updated.In modprobe.d I have acerhdf.conf with:
Code: Select alloptions acerhdf kernelmode=1 interval=10 fanon=65000 fanoff=60000
When the temp reaches 65c the fan comes on, but never shuts off. The fan does cool the cpu.If remove the module, and then modprobe it, the fan stops until the cpu reaches 65c.how to get the fan to shut off properly?
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Oct 20, 2015
I have a problem with my computer running debian testing with kde. When after a while I'm away form keyboard my screen turn off for power saving, but I cannot in any way turn it on again.
I tried moving mouse, pressing some key, Ctrl + Alt + Del, Ctrl + Alt + BackSpace, Ctrl + Alt + Esc, and also Ctrl+Alt+F1/2/ecc.. No way. I had to reset my computer every time.
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May 25, 2011
i am wanting to turn my Debian box into a wireless AP, but for some unknown reason the wireless card won't switch into master mode when i run the command #iwconfig wlan1 mode master i get this Error for wireless request "Set Mode" (8B06): SET failed on device wlan1 ; Invalid argument. what does this mean and what do i need to configure/install to get it to work my wirless card is supported i checked it's a zydas chipset using the zd1211rw driver SMC EZ Connect SMCWUSB-G [URL]
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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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Oct 25, 2010
If I suspend this toshiba satellite, and the battery is or gets low it will wake from suspend to tell me that it will need to suspend due to a critical low battery. Which is pretty dumb. I've experimented with this by plugging and unplugging the ac adapter.
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May 23, 2011
3 questions i have about "pm-suspend-hybrid"
1. is it possible to schedule this command in the same manner as shutdown ? eg sudo shutdown -h 60
2. is it possible to schedule the laptop to come out of suspend ?
3. i have a usb sound card (xfi go). when waking from suspend, the internal sound card is selected. i have to manually select the external sound card & for whatever reason, also unmute it too
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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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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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Sep 30, 2015
I'm running stock Debian 8.2 with GNOME DE on an Acer ES1-512 series laptop. Whenever I attempt to go into suspend, either by closing the laptop lid or holding ALT when clicking the power button in the top-left system menu on the desktop, my laptop briefly flashes the default GNOME lock screen, fades to black, and then hangs there. Usually, when my laptop would actually suspend, the power indicator light would change from blue to orange and slowly fade in and out. However, now it just sits on blue. There is no way to re-awaken the laptop from this state, and I have to force shutdown by holding the power button.
Running Code: Select allgrep -i error /var/log/messages gives me:
Code: Select allSep 28 17:59:57 debian gnome-session[1188]: [1504:1536:0928/175957:ERROR:mcs_client.cc(752)] Received close command, resetting connection.
Sep 28 18:17:50 debian gnome-session[1188]: [1504:1536:0928/181750:ERROR:mcs_client.cc(752)] Received close command, resetting connection.
Sep 28 21:27:52 debian gnome-session[1188]: [1504:1536:0928/212752:ERROR:channel.cc(307)] RawChannel read error (connection broken)
Sep 29 14:21:51 debian gnome-session[1188]: [1504:1536:0929/142151:ERROR:mcs_client.cc(752)] Received close command, resetting connection.
[code]....
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Mar 10, 2010
I have an issue with my Sony vaio fw31e not resuming from suspend. Reported this as a bug: [URL] The usual ways of suspending, from the kde 4 menu, from the power/battery widget or by lid closing always result in no resume. However, running pm-suspend from a root terminal suspends and resumes just fine. My question is, how does one delve into the way that the usual methods initiate suspend? Maybe if I could find out what each of these methods actually does, I may be able to see what is going wrong? I had been running squeeze on this lappy since July 2009 with no suspend issues until an update broke it sometime in January. The install is being fully upgraded every day at the moment.
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Jul 5, 2010
On my Sid laptop with iwlagn as the wireless driver, I use gnome with network manager. I lost all wireless capability when laptop failed to come out of suspend.
I have the power manager set up to suspend when the lid is closed. This morning when I opened the lid I got a blank screen with a blinking cursor. Without thinking, I forced shutdown with the power button. I know, don't say it. When I booted up I had no wireless at all. lspci doesn't recognize wlan0 lsmod shows iwlagn is still there I performed the following:
# modprobe -r iwlagn
# modprobe iwlagn
Now I have two drives on this laptop and Squeeze is on the other drive. When I boot into squeeze I have wireless activated.
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Apr 29, 2011
I have already installed gnome-power-manager.
There should be the suspend and hibernate buttons in th System Menu, but there is only two options, Shut down and Log off.Also, in the Power Manager Preferences window, it has no option for suspend and hibernate.
How to add suspend and hibernate options?
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Feb 16, 2011
Is there an "official" way to add suspend and hibernate functionality to the KDE logout/shutdown menu in Squeeze? What packages do I need?
ps. My computer is not a laptop - it's a normal desktop machine
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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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