Red Hat Bugzilla – Bug 435747
backlight turning off on X exit; vbetool doesn't help
Last modified: 2009-07-14 13:34:01 EDT
Description of problem:
When X exits (including rhgb), my backlight turns off. Just the backlight; the
display is still functional otherwise. vbetool won't turn it back on.
/sys/class/backlight is empty.
Workaround is rebooting :(
Version-Release number of selected component (if applicable):
Right, and my brightness keys don't work anymore.
Zack, can I get /var/log/Xorg.0.log, please? Things are changing so fast in
Rawhide, that what we get in some other bug is probably outdated already.
Created attachment 296750 [details]
log from this morning including reboot
Same for me. Don't know if it's related, but the brightness applet in gnome is
disabled (i.e. claims that the brightness can not be changed), and the
brightness keys on my X60s don't work, either.
Created attachment 296775 [details]
Try the following:
modprobe thinkpad_acpi brightness_mode=2
echo -n 7 > /sys/class/backlight/*/brightness
This allows me to turn my backlight on, but my brightness keys still don't work.
Note that with brightness_mode unset (I think the default is 3), I don't even
have a /sys/class/backlight/thinkpad_screen or a /proc/acpi/ibm/brightness.
Also, the brightness applet doesn't work either way.
(In reply to comment #6)
> Try the following:
> rmmod thinkpad_acpi
> modprobe thinkpad_acpi brightness_mode=2
> echo -n 7 > /sys/class/backlight/*/brightness
I have no file in /sys/class/backlight/
Neither do I.
Did you load thinkpad_acpi with brightness_mode=2? I need to do that to get the
Well, in any case, it's starting to look like this is the kernel's fault.
Maybe I should file a separate bug for the hotkeys: Neither evtest nor lshal -m
notice when I press any of my Thinkpad's special keys.
(In reply to comment #10)
> Did you load thinkpad_acpi with brightness_mode=2? I need to do that to get the
Yes, I did. No such file.
There are two interfaces to the firmware for direct brightness control,
EC and CMOS. To select which one should be used, use the
brightness_mode module parameter: brightness_mode=1 selects EC mode,
brightness_mode=2 selects CMOS mode, brightness_mode=3 selects both EC
and CMOS. The driver tries to autodetect which interface to use.
I forget which is the default, but it should be easy to check. If the default is
3, try 1. If it's 1, try 3. Hopefully one of these will help...
(In reply to comment #13)
> I forget which is the default, but it should be easy to check. If the default is
> 3, try 1. If it's 1, try 3. Hopefully one of these will help...
I tried setting the mode to 1, 2 , and 3. In neither case do I see a file or
directory in /sys/class/backlight. And this is with a newer kernel:
I'm seeing the same as comment #14. My kernel ate my backlight :(
Isn't it time to add this bug to the blocker list? If this isn't fixed machines
in their default configuration (with graphical booting) will be unusable.
For me (X60s, intel driver) the backlight does no longer turn
off when X exits in current rawhide. The gnome applet still does not
work, but my brightness keys do.
In the other hand, while the backlight stays on, the console does
no longer display anything, but that's a different bug.
Updated to kernel-2.6.25-0.172.rc7.git4.fc9.x86_64 and now it works. As far as
I'm concerned, this bug can be closed.
I'm seeing a similar problem in Fedora 9 Preview (rawhide), but only when the
laptop returns from suspend. The backlight on my Sony Vaio VGN-NR21J does not
light up, so I have to CTRL+ALT+F1 to the console and then back to X to make the
backlight return. I haven't seen this occur at any other point, only when
returning from suspend.
So, now my backlight is is turning back on properly in all cases, but I still
don't have anything in /sys/class/backlight.
Changing version to '9' as part of upcoming Fedora 9 GA.
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