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

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Message-ID: <1332380037.10557.398.camel@linux-s257.site>
Date:	Thu, 22 Mar 2012 09:33:57 +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 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 ?


Thanks a lot!
Joey Lee

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