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

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Date:	Thu, 22 Mar 2012 21:47:19 +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

On Thu, 2012-03-22 at 17:34 +0800, joeyli wrote:
> 於 四，2012-03-22 於 11:26 +0530，Pradeep Subrahmanion 提到：
> > >From acer acpi ,I came to know that the 4730 series uses new wmi interface .
> > 
> > http://code.google.com/p/aceracpi/wiki/SupportedHardware
> > 
> 
> I am not sure what is the WMIDv2, but it's not the current WMI v2 in
> acer-wmi driver.
> 
> > 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...
> > >
> > >
> 
> Please kindly try acpi_osi="!Windows 2006", I think it also works to
> you.

   I tried giving this option . It gives me a blank screen while
booting. Hot keys are not working .


> 
> 
> Thanks
> Joey Lee
> 


Regards, 

Pradeep Subrahmanion.


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