The brightness of my laptop is always on maximum and can't be scaled
down.
Brightness control via function keys was always working on this
laptop, so this is a regression in v3.11-rc2.
It is a FUJITSU LIFEBOOK AH532/FJNBB1C, BIOS Version 1.09 05/22/2012
Video driver is i915.
Please Cc me in answeres , I am not subscribed.
Thanks, Jörg
On Tuesday, July 23, 2013 09:52:15 AM Jörg Otte wrote:
> The brightness of my laptop is always on maximum and can't be scaled
> down.
> Brightness control via function keys was always working on this
> laptop, so this is a regression in v3.11-rc2.
Is there any other way to control brightness on your system (eg. through a GUI)?
If so, does it work?
Also, does reverting commit efaa14c help? If it doesn't help, does reverting
commit 8c5bd7a too (so that both are reverted) help?
Rafael
On 07/23/2013 03:52 PM, Jörg Otte wrote:
> The brightness of my laptop is always on maximum and can't be scaled
> down.
> Brightness control via function keys was always working on this
> laptop, so this is a regression in v3.11-rc2.
Please list /sys/class/backlight.
If there is a intel_backlight, please try to adjust brightness level
through brightness file like this:
# echo XXX > /sys/class/backlight/intel_backlight/brightness
Does it work?
Thanks,
Aaron
>
> It is a FUJITSU LIFEBOOK AH532/FJNBB1C, BIOS Version 1.09 05/22/2012
> Video driver is i915.
>
> Please Cc me in answeres , I am not subscribed.
>
> Thanks, Jörg
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>
2013/7/24 Aaron Lu <[email protected]>:
> On 07/23/2013 03:52 PM, Jörg Otte wrote:
>> The brightness of my laptop is always on maximum and can't be scaled
>> down.
>> Brightness control via function keys was always working on this
>> laptop, so this is a regression in v3.11-rc2.
>
> Please list /sys/class/backlight.
# cd /sys/class
# find backlight -name "*"
backlight
backlight/intel_backlight
# cd backlight/intel_backlight
# ls
actual_brightness bl_power brightness device max_brightness power
subsystem type uevent
# cat actual_brightness
0
# cat max_brightness
4882
actual_brightness is 0, but brightness is on maximum!
>
> If there is a intel_backlight, please try to adjust brightness level
> through brightness file like this:
> # echo XXX > /sys/class/backlight/intel_backlight/brightness
> Does it work?
no, it doesn't have any visible effect.
Thanks, Jörg
2013/7/24 Rafael J. Wysocki <[email protected]>:
> On Tuesday, July 23, 2013 09:52:15 AM Jörg Otte wrote:
>> The brightness of my laptop is always on maximum and can't be scaled
>> down.
>> Brightness control via function keys was always working on this
>> laptop, so this is a regression in v3.11-rc2.
>
> Is there any other way to control brightness on your system (eg. through a GUI)?
Yes
> If so, does it work?
No, it has no visible effect.
> Also, does reverting commit efaa14c help?
No
> If it doesn't help, does reverting
> commit 8c5bd7a too (so that both are reverted) help?
Yes, reverting both fixes the problem for me.
Thanks, Jörg