Am 18.07.2014 18:25, schrieb Daniel Vetter:
On Fri, Jul 18, 2014 at 4:49 PM, Jan Niggemann <jn@xxxxxx> wrote:
Am 18.07.2014 15:27, schrieb Daniel Vetter:
On Thu, Jul 17, 2014 at 10:31:30PM +0200, Jan Niggemann wrote:
I'm experiencing an issue with 3.15.5 on my Lenovo T400:
Since 3.15 (or 3.14, can't say for sure), the boot starts
normally, but
the
first mode change doesn't occur, resulting in a black screen with
backlight
on. The system is entirely unresponsive and I can only press the
power
button until to switch it off.
I think the only way to move forward here is to double-check that
3.14
works and 3.15 is broken by recompiling with the same .config
(occasionally config changes cause regressions). And then do a full
git
bisect to find the offending commit.
thank you for the feedback.
I still have all my custom built kernels, I will test 3.14.0 through
3.14.8
to make sure those were OK and report back.
You only need to test 3.14.0, since the backported fixes only contain
a very small subset of all patches for 3.15. So it's more efficient
to
then switch to git bisect between 3.14 and 3.15 directly (after
you've
confirmed that 3.15.0 is indeed busted).
I familiarized with git bisect, that was something I had never used
before.
I started it with "git bisect start v3.15 v3.14 --
drivers/gpu/drm/i915"
This lead me to this:
cfa7c862982b431add7f2b362526bf31372fc7b0 is the first bad commit
commit cfa7c862982b431add7f2b362526bf31372fc7b0
Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date: Tue Apr 29 11:53:58 2014 +0200
drm/i915: Sanitize the enable_ppgtt module option once
Otherwise we'll end up spamming dmesg on every context creation on
snb
with vt-d enabled. This regression was introduced in
commit 246cbfb5fb9a1ca0997fbb135464c1ff5bb9c549
Author: Ben Widawsky <benjamin.widawsky@xxxxxxxxx>
Date: Fri Dec 6 14:11:14 2013 -0800
drm/i915: Reorganize intel_enable_ppgtt
As the i915.enable_ppgtt is read-only it cannot be changed after
the
module is loaded and so we can perform an early sanitization of the
values.
v2:
- Add comment and pimp commit message (Chris)
- Use the param consistently (Jani)
v3:
- Fix init sequence on pre-gen6 by moving the sanitize_ppgtt call
to
gtt_init. Fixes boot hangs on pre-gen6.
- Add a debug output for the sanitize ppgtt mode.
References: https://lkml.org/lkml/2014/4/17/599
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=77916
Cc: Alessandro Suardi <alessandro.suardi@xxxxxxxxx>
Cc: Ben Widawsky <ben@xxxxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
:040000 040000 5488e397a1aaa28dca4a252452e9463b0a8f8d10
214c8e98b3c72844e48ab7aef02cba7daf139fab M drivers
I realized that the issue does always show, contrary to the subject
initially chosen.
Unfortunately I can't say anything else, but maybe this will help you
experts spot the issue.
If I can help more, be it with testing or anything else, just let me
know.
Regards
jan
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