linux-kernel - Re: 3.7.X vs 3.6.11 HP Folio 9470m brightness regression?

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Date:	Sat, 12 Jan 2013 21:35:15 +0100
From:	Fabio Coatti <fabio.coatti@...il.com>
To:	Daniel Vetter <daniel.vetter@...ll.ch>,
	Bob Moore <robert.moore@...el.com>,
	Feng Tang <feng.tang@...el.com>,
	Len Brown <len.brown@...el.com>
Cc:	Tom St Denis <tstdenis@...iptictech.com>,
	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: 3.7.X vs 3.6.11 HP Folio 9470m brightness regression?

well, I tried to do that, bisecting between 3.6.10 and 3.7. I'm not
sure to have done that properly, as the result seems quite harmless,
however here it is:

d978348b300595b067b80980f6a78db09fcd584c is the first bad commit
commit d978348b300595b067b80980f6a78db09fcd584c
Author: Bob Moore <robert.moore@...el.com>
Date:   Fri Aug 17 10:51:47 2012 +0800

    ACPICA: Split ACPICA initialization functions to new file, utxfinit.c

    Split utxface.c to improve modularity and reduce file size.

    Signed-off-by: Bob Moore <robert.moore@...el.com>
    Signed-off-by: Feng Tang <feng.tang@...el.com>
    Signed-off-by: Len Brown <len.brown@...el.com>

:040000 040000 57bc8451026afe02fdbc2970b152164ff4e5412a
55311ce2f9fed66501b06f93f67fa99b54d46e86 M      drivers

Please let me know If I've done something wrong or if I can help in other ways.

Many thanks for the hint.


2013/1/12 Daniel Vetter <daniel.vetter@...ll.ch>:
> On Sat, Jan 12, 2013 at 12:22 PM, Fabio Coatti <fabio.coatti@...il.com> wrote:
>> 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 ;)
>
> If the regression is with the acpi_video backlight, then it's very
> likely not a bug in drm/i915. Quickest way to figure that out is to do
> a git bisect between 3.6 and 3.7, my favourite howto is:
> http://www.reactivated.net/weblog/archives/2006/01/using-git-bisect-to-find-buggy-kernel-patches/
>
> Cheers, Daniel
>
>> 2012/12/20 Fabio Coatti <fabio.coatti@...il.com>:
>>> In data mercoledì 19 dicembre 2012 17:10:29, hai scritto:
>>>> ----- Original Message -----
>>>>
>>>> > From: "Fabio Coatti" <fabio.coatti@...il.com>
>>>> > To: linux-kernel@...r.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
>
>
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch



-- 
Fabio
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