[trusty] ACPI / video: Change the default for video.use_native_backlight to 1

[Seth Forshee]

On Wed, Jun 18, 2014 at 10:21:31AM +0800, Yidi Lin wrote:
> Thanks for reminding.
> 
> I will check what patches are necessary when use_native_backlight=1 is in use.

Your other option is a sauce patch to add this machine to the dmi list
in acpi_video.c. I think this is the safer option to avoid regressions
with other hardware in 3.13. They've been working on these backlight
issues for a long time because the solutions kept causing regressions on
various machines, so I'm going to remain skeptical that they've really
eliminated all the regressions until the changes have been upstream for
quite a bit longer.

Seth

> 
> On Tue, Jun 17, 2014 at 7:40 PM, Tim Gardner <tim.gardner at canonical.com> wrote:
> > On 06/16/2014 10:55 PM, Yidi Lin wrote:
> >> BugLink: https://bugs.launchpad.net/bugs/1250401
> >>
> >> This patch is committed in v3.16-rc1 which fixes win8 backlight issue.
> >> I had verified this patch for bug #1250401.
> >>
> >> This patch also fixes bug #1284030.
> >>
> >> commit 751109aad5834375ca9ed0dcfcd85a00cbf872b5
> >> Author: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
> >> Date:   Thu Jun 5 22:47:35 2014 +0200
> >>
> >>     ACPI / video: Change the default for video.use_native_backlight to 1
> >>
> >>     Now that we're hoping to have resolved all of the problems with
> >>     video.use_native_backlight=1, make that the default at last.
> >>
> >>     Link: http://marc.info/?l=linux-acpi&m=139716088401106&w=2
> >>     Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
> >>
> >
> > While this patch may fix back light issues for a Dell Inspiron 5737, how
> > do you know changing the default won't break other platforms ? I imagine
> > there was a bit of work that went into back light support between 3.13
> > and 3.16-rc1, so I'm not sure flipping the default in 3.13 is sufficient.
> >
> > rtg
> > --
> > Tim Gardner tim.gardner at canonical.com
> 
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