linux-kernel - Re: 3.13 i915 brightness settings broken when going from docked -> undocked

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Message-ID: <87zjl64a41.fsf@intel.com>
Date:	Tue, 04 Mar 2014 10:54:38 +0200
From:	Jani Nikula <jani.nikula@...ux.intel.com>
To:	Paul Bolle <pebolle@...cali.nl>
Cc:	Josh Boyer <jwboyer@...oraproject.org>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	intel-gfx@...ts.freedesktop.org,
	"Linux-Kernel\@Vger. Kernel. Org" <linux-kernel@...r.kernel.org>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>
Subject: Re: 3.13 i915 brightness settings broken when going from docked -> undocked

On Tue, 04 Mar 2014, Paul Bolle <pebolle@...cali.nl> wrote:
> On Tue, 2014-02-25 at 10:05 +0200, Jani Nikula wrote:
>> On Thu, 20 Feb 2014, Paul Bolle <pebolle@...cali.nl> wrote:
>> > On an (rather old) ThinkPad X41, which also uses i915, brightness
>> > adjustments stopped working altogether in v3.14-rc1 (I haven't used its
>> > docking station in the v3.14 release cycle). In v3.13.y things behave as
>> > expected. So perhaps there's actually a more general problem here.
>> 
>> I presume different problems. Does the ThinkPad X41 have gen3 graphics?
>> (See e.g. /sys/kernel/debug/dri/0/i915_capabilities) If yes, it might be
>> https://bugs.freedesktop.org/show_bug.cgi?id=75001
>
> Yes, it has "gen3" graphics (a 915GM). And applying your patch
> "drm/i915: use backlight legacy combination mode also for
> i915gm/i945/gm" on top of v3.14-rc5 fixes the issue on that ThinkPad
> X41.

Thanks for confirming this on i915gm too.

BR,
Jani.


-- 
Jani Nikula, Intel Open Source Technology Center
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