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

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Date:	Thu, 22 Mar 2012 11:54:49 +0800
From:	joeyli <jlee@...e.com>
To:	Pradeep Subrahmanion <subrahmanion.pradeep@...il.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

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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