Bugzilla – Bug 47965
[NVC1] brightness adjustments don't work on HP Elitebook 8560w
Last modified: 2015-01-25 23:14:51 UTC
I have this nvidia card :
01:00.0 VGA compatible controller: nVidia Corporation GF108 [Quadro 1000M] (rev
But I can't modify the brightness, xbacklight or to modify
And the touch in the keyboard for this is recognize by Gnome 3.2 (an pop-up
with brightness image appears) but nothing, the brightness is the same !
It's very problematic, because it's a laptop and I can't stamp 3 hours of autonomy.
I had tested with nVidia's driver, it's possible to change the brightness with it.
Would you mind attaching your dmesg & Xorg.0.log (text/plain) while using nouveau
It may be worth mentioning what laptop you're using
Created attachment 59231 [details]
dmesg with nouveau and no brightness change
Created attachment 59232 [details]
Xorg.0.log with nouveau and no brightness change
Ok, I have posted theses logs with a test. I have tried to change brightness some seconds before the save of logs…
But the brightness sensors is active and the brightness change with the ambient luminosity.
I use the laptop HP Elitebook 8560w.
I would help your to solve this bug, but I don't know how how... Do you need more information ? An another action ?
Try using "acpi_backlight=vendor" (as a parameter to your kernel command line). It will force the nouveau backlight to be used rather than the ACPI one
Note that there is a similar issue with HP Elitebook 8530w (see bug 39550)
Quick search indicates that HP laptops are quite common with those type of issues
Apart from that can you attach your vbios 
I have tested this option and the result is :
-The brightness didn't change
-The shortcut (Fn+XX) didn't detect by the system, usually the brightness didn't change but Gnome display a bar with the « new » brightness (but it's virtual…).
I post the vbios with the command line :
cat /sys/kernel/debug/dri/0/vbios.rom > vbios.rom
I tested the tool vbtracetool, but it can't do that and the patch no improve the situation.
Created attachment 69964 [details]
nVidia Quadro 1000m vbios
Do you need more information ?
I am available if it's necessary. ;)
Thanks in all case.
Is this still an issue, with acpi_backlight=vendor, with the latest kernel?
(In reply to Ilia Mirkin from comment #11)
> Is this still an issue, with acpi_backlight=vendor, with the latest kernel?
I guess it is not after all that time with no answer!
Closing as fixed. Anybody with this problem, feel free to reopen!
Changing to "Resolved Invalid". Its more appropriate, thanks for pointing that out pmoreau!