[v3.11-rc2] regression: brightness always on maximum.

[v3.11-rc2] regression: brightness always on maximum.

[Jörg Otte]

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

Re: [v3.11-rc2] regression: brightness always on maximum.

[Rafael J. Wysocki]

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

Re: [v3.11-rc2] regression: brightness always on maximum.

[Aaron Lu]

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 majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
> 

Re: [v3.11-rc2] regression: brightness always on maximum.

[Jörg Otte]

2013/7/24 Aaron Lu <aaron.lwe@gmail.com>:
> 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

Re: [v3.11-rc2] regression: brightness always on maximum.

[Jörg Otte]

2013/7/24 Rafael J. Wysocki <rjw@sisk.pl>:
> 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