Bug 102251 - i915, cannot set modeline (pipe state doesn't match)
Summary: i915, cannot set modeline (pipe state doesn't match)
Status: RESOLVED OBSOLETE
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - Intel) (show other bugs)
Hardware: i386 Linux
: P1 normal
Assignee: intel-gfx-bugs@lists.freedesktop.org
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-08-04 11:30 UTC by Matthieu Gautier
Modified: 2015-10-07 11:19 UTC (History)
2 users (show)

See Also:
Kernel Version: 4.2.0-0.rc3.git2.2.fc22.i686
Subsystem:
Regression: No
Bisected commit-id:

Attachments
dmesg with drm.debug=0x1e (481.89 KB, text/plain)
2015-08-04 11:30 UTC, Matthieu Gautier 		Details
xrandr output (10.84 KB, text/plain)
2015-08-04 11:31 UTC, Matthieu Gautier 		Details
lspci output (1.84 KB, text/plain)
2015-08-04 11:34 UTC, Matthieu Gautier 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Matthieu Gautier 2015-08-04 11:30:26 UTC 
Created attachment 184211 [details]
dmesg with drm.debug=0x1e

On a tablet WinBook TW700 (BayTrail), tablet screen stay black. Everything work for the external plugged screen.

Kernel is this one : http://copr.fedoraproject.org/coprs/hadess/32bit-boot/build/105288/

xrandr detect correctly the two screens (DSI1 and HDMI1)

From trace, it seems that kernel cannot set modeline setting of the tablet screen.

Attached trace is dmesg with kernel argument drm.debug=0x1e and the external screen plugged. See timestamp 5.110791
Comment 1 Matthieu Gautier 2015-08-04 11:31:25 UTC 
Created attachment 184221 [details]
xrandr output
Comment 2 Matthieu Gautier 2015-08-04 11:34:14 UTC 
Created attachment 184231 [details]
lspci output

Output from 
lspci -vv -k -xxxx -s 00:02.0
Comment 3 Matthieu Gautier 2015-08-04 14:01:59 UTC 
With kms deactivated (nomodeset i915.modeset=0) screen is working.
Comment 4 Jani Nikula 2015-10-07 11:19:41 UTC 
We seem to have neglected this bug. Apologies. It may have been fixed in later kernels.

If the problem persists with latest kernels, please file a bug at the freedesktop.org bugzilla [1], referencing this bug. Thank you.

[1] https://bugs.freedesktop.org/enter_bug.cgi?product=DRI&component=DRM/Intel
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