linux-kernel - Re: [PATCH] Added backlight driver for Acer Aspire 4736

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Date:	Thu, 22 Mar 2012 11:26:00 +0530
From:	Pradeep Subrahmanion <subrahmanion.pradeep@...il.com>
To:	joeyli <jlee@...e.com>
Cc:	Matthew Garrett <mjg@...hat.com>, rpurdie@...ys.net,
	FlorianSchandinat@....de, akpm@...ux-foundation.org,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Added backlight driver for Acer Aspire 4736

>From acer acpi ,I came to know that the 4730 series uses new wmi interface .

http://code.google.com/p/aceracpi/wiki/SupportedHardware

Thanks ,

Pradeep Subrahmanion

On Thu, Mar 22, 2012 at 9:24 AM, joeyli <jlee@...e.com> wrote:
> 於 四，2012-03-22 於 09:02 +0530，Pradeep Subrahmanion 提到：
>> On Thu, 2012-03-22 at 11:25 +0800, joeyli wrote:
>> > 於 四，2012-03-22 於 08:03 +0530，Pradeep Subrahmanion 提到：
>> > > On Thu, 2012-03-22 at 09:33 +0800, joeyli wrote:
>> > > > 於 四，2012-03-22 於 00:39 +0530，Pradeep Subrahmanion 提到：
>> > > > > > This new patch should remove acpi_video0 interface on your machine.
>> > > > > > Please kindly provide your dmidecode:
>> > > > > >  dmidecode > dmidecode.log
>> > > > > >
>> > > > > > And,
>> > > > > > please make should the patch really applied, you can do a bit change on
>> > > > > > pr_info message by yourself.
>> > > > >
>> > > > >    Sorry . I think there was some mistake . I tried the patch again. Now
>> > > > > I see only intel_backlight inside /sys/class/backlight. There is no
>> > > > > acer-wmi interface . Is this the expected behavior ? . Or am I missing
>> > > > > anything ?
>> > > > >
>> > > >
>> > > > Yes, this is the expected behavior! But, now I doubt your issue was
>> > > > workaround by acpi_osi=Linux but not intel_backlight.
>> > > >
>> > >
>> > > > >
>> > > > >
>> > > > > >
>> > > > > > > echo 5 > /sys/class/backlight/acpi_video0/brightness
>> > > > > > > echo 5 > /sys/class/backlight/intel_backlight/brightness
>> > > > > > >
>> > > > > > > But it doesn't make any change .
>> > > > > > >
>> > > > > > > In my case  , 'acpi_backlight = vendor' does not make any difference since the hot key control
>> > > > > > >
>> > > > > > > already starts working with 'acpi_osi=Linux' option.
>> > > > > > >
>> > > > > > > cat /proc/cmdline gives ,
>> > > > > > >
>> > > > > > > BOOT_IMAGE=/boot/vmlinuz-3.3.0+
>> > > > > > > root=UUID=f0197a59-c067-4fd8-ad90-c4d721816077 ro acpi_osi=Linux
>> > > > > > >
>> > > > > > >
>> > > > > > > Thanks ,
>> > > > > > >
>> > > > > > > Pradeep Subrahmanion
>> > > > > > >
>> > > > > >
>> > > > > > OK, that's more clearly, please remove acpi_osi=Linux then re-test, I
>> > > > > > think the hotkey of backlight control only works with acpi_osi=Linux ?
>> > > > > >
>> > > >
>> > > > Does your backlight control still work if you remove acpi_osi=Linux ?
>> > >
>> > >    If I remove acpi_osi=Linux , the hot key control stops working .
>> > >
>> >
>> > What is the preload OS in your machine when you bought it? Windows XP,
>> > Vista or Windows 7?
>>
>>    It was Windows XP.
>>
>
> The WDDM driver didn't support by Windows XP, the brightness control on
> XP should works with _BCM or OpRegion.
>
> Wonder how does brightness control work on XP with your machine.
>
> I will dig more in your dsdt...
>
>
> Thanks
> Joey Lee
>
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