linux-kernel - Re: Linux 2.6.37

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Date:	Thu, 6 Jan 2011 22:08:46 +0100
From:	Alex Riesen <raa.lkml@...il.com>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Michal Hocko <mhocko@...e.cz>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org
Subject: Re: Linux 2.6.37

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.

P.S. Probably unrelated, but I just noticed that the backlight never goes
off when closing the lid. Am I supposed to hook up on the corresponding
input event and put the panel in standby? It used to work all by itself,
I think...
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