Bug 56401

Summary:

[IVB eDP stable-regression] laptop screen does not come up until a suspend/resume cycle happens.

Product:

DRI

Reporter:

roberth <sarvatt>

Component:

DRM/Intel

Assignee:

Daniel Vetter <daniel>

Status:

CLOSED FIXED

QA Contact:

Severity:

normal

Priority:

high

CC:

ben, chris, daniel, jani.nikula, jbarnes

Version:

XOrg git

Hardware:

x86-64 (AMD64)

OS:

Linux (All)

Whiteboard:

i915 platform:

i915 features:

Attachments:

Description	Flags
dmesg after reproducing it with drm.debug=0xe	none
intel_reg_dumper output (working)	none
intel_reg_dumper output (failing)	none
3.6.3 dmesg	none
edid	none

Description roberth 2012-10-25 16:24:06 UTC

Created attachment 69076 [details]
dmesg after reproducing it with drm.debug=0xe

This commit causes a lenovo v490u to have a black screen after booting

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=4344b813f105a19f793f1fd93ad775b784648b95 

It's working properly in 3.7, but 3.6 is broken without reverting that, and that commit was backported to the stable kernels which are now broken also. Suspending/resuming the machine after booting brings the display back up.

(working with revert)
[   12.179335] [drm:intel_choose_pipe_bpp_dither], clamping display bpc (was -1) to eDP (6)
[   12.179337] [drm:intel_choose_pipe_bpp_dither], setting pipe bpc to 8 (max display bpc 6)

(failing)
[   14.264823] [drm:intel_choose_pipe_bpp_dither], setting pipe bpc to 8 (max display bpc 8)

Comment 1 roberth 2012-10-25 16:24:52 UTC

Created attachment 69077 [details]
intel_reg_dumper output (working)

Comment 2 roberth 2012-10-25 16:25:16 UTC

Created attachment 69078 [details]
intel_reg_dumper output (failing)

Comment 3 Daniel Vetter 2012-10-25 18:52:31 UTC

Please double-check whether your 3.6 tree contains:

commit 0c96c65b48fba3ffe9822a554cbc0cd610765cd5
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Wed Sep 26 18:43:10 2012 +0300

    drm/i915: use adjusted_mode instead of mode for checking the 6bpc force flag

This should fix fallout from the cited commit.

Comment 4 roberth 2012-10-25 19:24:19 UTC

No luck unfortunately, tried 3.2.32 and 3.6.3 that both contain that commit and they have the same problem.

Comment 5 roberth 2012-10-25 19:24:49 UTC

Created attachment 69090 [details]
3.6.3 dmesg

Comment 6 Jani Nikula 2012-11-07 11:20:13 UTC

Related to https://bugzilla.kernel.org/show_bug.cgi?id=47641

Robert, please add the hex dump of your EDID from /sys/class/drm/*/edid, where * is your display.

Comment 7 roberth 2012-11-09 15:19:20 UTC

Created attachment 69821 [details]
edid

00ffffffffffff000dae771400000000
02160103801f11780a2b359757548f29
23505400000001010101010101010101
010101010101da1d56e250002030442d
470035ae10000018e01856e250002030
442d470035ae10000018000000fe0043
4d4e0a202020202020202020000000fe
004e3134304247452d4c41320a200051

Comment 8 roberth 2012-11-11 15:56:01 UTC

Another eDP machine (dell e6510) broken by this commit on 

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1077064

Comment 9 Daniel Vetter 2012-11-13 12:15:59 UTC

Revert merged to -fixes:

commit 2f4f649a69a9eb51f6e98130e19dd90a260a4145
Author: Jani Nikula <jani.nikula@intel.com>
Date:   Mon Nov 12 14:33:44 2012 +0200

    drm/i915: do not ignore eDP bpc settings from vbt

Please yell if this is still an issue for you.

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.