From: Jani Nikula <jani.nikula@linux.intel.com>
To: Marc Milgram <mmilgram@redhat.com>, intel-gfx@lists.freedesktop.org
Subject: Re: Screen extremely dim on Dell Latitude D630 after upgrading to Linux kernel-3.14
Date: Mon, 26 May 2014 12:57:42 +0300 [thread overview]
Message-ID: <8738fw276x.fsf@intel.com> (raw)
In-Reply-To: <537E5B6D.1030408@redhat.com>
On Thu, 22 May 2014, Marc Milgram <mmilgram@redhat.com> wrote:
> After upgrading to linux Kernel-3.14, the screen on my Dell Latitude
> D630 was nearly unreadably dim. When I Boot the 3.13 kernel, my screen
> is bright.
Please file a new bug on DRM/Intel at [1]. Please attach
/sys/kernel/debug/dri/0/i915_opregion and dmesg with drm.debug=0xe
module parameter set.
Also include info whether max_brightness changes for you between 3.13
and 3.14.
Do the later 3.15-rc kernels work for you?
BR,
Jani.
[1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI
>
> I opened a Bug here: https://bugzilla.redhat.com/show_bug.cgi?id=1094066
> and others have chimed in that they have the same problem.
>
> I bisected the kernel, and found the following commit is responsible for
> this problem:
>
> b35684b8fa94e04f55fd38bf672b737741d2f9e2 is the first bad commit
> commit b35684b8fa94e04f55fd38bf672b737741d2f9e2
> Author: Jani Nikula <jani.nikula@intel.com <mailto:jani.nikula@intel.com>>
> Date: Thu Nov 14 12:13:41 2013 +0200
>
> drm/i915: do full backlight setup at enable time
>
> We should now have all the information we need to do a full
> initialization of the backlight registers.
>
> v2: Keep QUIRK_NO_PCH_PWM_ENABLE for now (Imre).
>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com <mailto:jani.nikula@intel.com>>
> Reviewed-by: Imre Deak <imre.deak@intel.com <mailto:imre.deak@intel.com>>
> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch <mailto:daniel.vetter@ffwll.ch>>
>
> :040000 040000 0aae5515ca62ff1bfd2e1c2769e30c58b016ffeb 01c2f8cd145f8cf29730908d52e7e89b787a059e M drivers
>
> I can find my way around the kernel, but haven't hit this area before.
>
> Any help is appreciated.
>
> Marc Milgram
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Jani Nikula, Intel Open Source Technology Center
prev parent reply other threads:[~2014-05-26 9:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-22 20:17 Screen extremely dim on Dell Latitude D630 after upgrading to Linux kernel-3.14 Marc Milgram
2014-05-26 9:57 ` Jani Nikula [this message]
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