Re: [PATCH] ACPI / Video: Fix initial brightness problem on Acer Ferrari One

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On Wed, 2010-04-07 at 02:51 +0800, Rafael J. Wysocki wrote:
> On Tuesday 06 April 2010, Zhang Rui wrote:
> > On Mon, 2010-04-05 at 07:19 +0800, Rafael J. Wysocki wrote:
> > > On Friday 02 April 2010, Rafael J. Wysocki wrote:
> > > > On Friday 02 April 2010, Zhang Rui wrote:
> > > > > On Fri, 2010-04-02 at 03:45 +0800, Rafael J. Wysocki wrote:
> > > > > > On Thursday 01 April 2010, Zhang Rui wrote:
> > > > > > > On Thu, 2010-04-01 at 09:34 +0800, Zhang Rui wrote:
> > > > > > > > On Thu, 2010-04-01 at 09:19 +0800, Rafael J. Wysocki wrote:
> > > 
> > > This patch may not be necessary after all.
> > > 
> > > I'll repost it if I find it's still needed.
> > > 
> > okay.
> > I re-read the code and find out that you're right. sorry for the noise.
> > 
> > please feel free to add an Acked-by from me next time you send it to the
> > list.
> 
> Thanks, but it looks like only one box is affected and because its BIOS returns
> the minimal brightness value in the initial _BQC.

> I'm not sure if it's worth
> changing the current behavior because of that.
> 

well. in the ACPI video driver, we assume that BIOS sets a PROPER
brightness level when loading OS.
so we use the _BQC return value as the default backlight, but apparently
this doesn't work well in this BIOS.
I would rather say this is a BIOS problem, which I'm not sure if we
should fix it in Linux kernel or not...

thanks,
rui

> Rafael
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