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SubjectRe: 3.7.X vs 3.6.11 HP Folio 9470m brightness regression?
From
I'm seeing the same behaviour on 3.7.2; even
echo "NN" > brightness has no effect.
I've tried to look at changes between 3.6.11 and 3.7.2 but probably
this is beyond my skills ;)



2012/12/20 Fabio Coatti <fabio.coatti@gmail.com>:
> In data mercoledì 19 dicembre 2012 17:10:29, hai scritto:
>> ----- Original Message -----
>>
>> > From: "Fabio Coatti" <fabio.coatti@gmail.com>
>> > To: linux-kernel@vger.kernel.org
>> > Sent: Wednesday, 19 December, 2012 5:01:30 PM
>> > Subject: 3.7.X vs 3.6.11 HP Folio 9470m brightness regression?
>> >
>> > Hi,
>> > I'm testing kernels 3.7.X vs 3.6.11 on an HP Folio 9470m machine,
>> > i915
>> > driver for a VGA compatible controller: Intel Corporation 3rd Gen
>> > Core
>> > processor Graphics Controller (rev 09) 8086:0166
>> >
>> > With 3.6.11, the brightness can be correctly set using fn+f9/10: kde
>> > shows the bar and brightness changes.
>> >
>> > With 3.7.1 kde shows the percentage bar and
>> > /sys/class/backlight/acpi_video0/brightness is updated, but the
>> > screen
>> > brightness does not changes.
>>
>> I had a similar problem with my Dell laptop and i915/acpi...
>>
>> Is there another acpi_video? device? In my case two showed up in 3.7
>> whereas in 3.6 there was one. In 3.7 it was controlling the wrong one
>> apparently.
>
> Well, this seems not to be the case, I have only one acpi_video:
>
> calvin ~ # ls -l /sys/class/backlight/
> totale 0
> lrwxrwxrwx 1 root root 0 20 dic 09.20 acpi_video0 ->
> ../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video0
>
> calvin ~ # ls -l /sys/devices/pci0000:00/0000:00:02.0/backlight
> totale 0
> drwxr-xr-x 3 root root 0 20 dic 09.20 acpi_video0
>
>
>
> --
> Fabio



--
Fabio
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