Re: [PATCH 2/2] ACPI video: add initial blacklist to use vendor drivers for backlight

[Anisse Astier <anisse@astier.eu>]

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Hi Matthew,

On Tue, 18 Jan 2011 19:44:42 +0000, Matthew Garrett <mjg59@srcf.ucam.org> wrote :

> On Tue, Jan 18, 2011 at 05:37:18PM -0200, Herton Ronaldo Krzesinski wrote:
> > On Tue, 18 Jan 2011 19:30:51 +0000
> > Matthew Garrett <mjg59@srcf.ucam.org> wrote:
> > 
> > > Ugh. Ok, how does this work on Windows?
> > 
> > On a provided by vendor windows image, the default brightness slider in windows
> > didn't worked too... only a vendor supplied utility is able to change the
> > brightness.
> 
> Awesome. Any chance you can provide the acpidump output for one of these 
> machines? I'd prefer to find a more elegant solution.
> 

I just encountered the same problem while debugging a machine using msi-wmi:
 - msi-wmi driver relied on the fact that there wouldn't be an acpi_video
   backlight device to load backlight support, therefore backlight
   buttons don't work by default.
 - On windows, it needs the vendor supplied driver to be installed before
   backlight buttons are supported (installed after first boot on the OEM
   image) 


Please find the DSDT of this computer attached.

Regards,

Anisse

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