[Intel-gfx] [PATCH v5 0/4] Fix Win8 backlight issue

[Yves-Alexis Perez]

On sam., 2013-10-12 at 00:10 +0200, Rafael J. Wysocki wrote:
> On Friday, October 11, 2013 12:42:43 PM Josh Boyer wrote:
> > On Fri, Oct 11, 2013 at 9:27 AM, Aaron Lu <aaron.lu at intel.com> wrote:
> > > v5:
> > > 1 Introduce video.use_native_backlight module parameter and set its
> > >   value to false by default as suggested by Rafael. For Win8 systems
> > >   which have broken ACPI video backlight control, the parameter can be
> > >   set to 1 in kernel cmdline to skip registering ACPI video's backlight
> > >   interface. Due to this change, the acpi_video_verify_backlight_support
> > >   is moved from video_detect.c to video.c - patch 3/4;
> > 
> > That's a fairly untenable position for distro kernels to be in.  They
> > now have to ask every user that reports an issue with the backlight to
> > try setting that option on the command line.  While I appreciate the
> > setting breaks things for some people, doesn't the Win8 issue impact
> > far more people?  Shouldn't it be defaulted to true?
> 
> Well, we have a rule in the kernel not to introduce regressions for users even
> if they are minority.

Well, for some users, the regression actually happened when support for
Win8 OSI call was introduced.

Regards,
-- 
Yves-Alexis
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