linux-kernel - Re: Linux 2.6.37

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Date:	Fri, 7 Jan 2011 16:52:00 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Alex Riesen <raa.lkml@...il.com>
Cc:	Chris Wilson <chris@...is-wilson.co.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org
Subject: Re: Linux 2.6.37

On Thu 06-01-11 22:08:46, Alex Riesen wrote:
> On Thu, Jan 6, 2011 at 21:55, Alex Riesen <raa.lkml@...il.com> wrote:
> > On Thu, Jan 6, 2011 at 18:49, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> >>
> >> My fear is that some machines have a dependency between the backlight
> >> and panel power status. The patch in question changed the timing between
> >> turning on the panel and adjusting the backlight which would be restore
> >> with:
> >>
> >> diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
> >> index aa23070..0b40b4f 100644
> >> --- a/drivers/gpu/drm/i915/intel_lvds.c
> >> +++ b/drivers/gpu/drm/i915/intel_lvds.c
> >> @@ -106,6 +106,12 @@ static void intel_lvds_enable(struct intel_lvds *intel_lvds)
> >> ?? ?? ?? ??I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
> >> ?? ?? ?? ??POSTING_READ(lvds_reg);
> >>
> >> + ?? ?? ?? {
> >> + ?? ?? ?? ?? ?? ?? ?? u32 reg = HAS_PCH_SPLIT(dev) ? PCH_PP_STATUS : PPS_STATUS;
> ...
> > FWIW it does not compile:
> > ??CC ?? ?? ??drivers/gpu/drm/i915/intel_lvds.o
> > drivers/gpu/drm/i915/intel_lvds.c: In function ???intel_lvds_enable???:
> > drivers/gpu/drm/i915/intel_lvds.c:110: error: ???PPS_STATUS??? undeclared
> 
> Ah, I see. Should be PP_STATUS. Whatever. It does not help. The backlight
> stays off.

It didn't help in my case either

-- 
Michal Hocko
L3 team 
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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