Bug 102251

Summary:	i915, cannot set modeline (pipe state doesn't match)
Product:	Drivers	Reporter:	Matthieu Gautier (dev)
Component:	Video(DRI - Intel)	Assignee:	intel-gfx-bugs (intel-gfx-bugs)
Status:	RESOLVED OBSOLETE
Severity:	normal	CC:	bugzilla, intel-gfx-bugs
Priority:	P1
Hardware:	i386
OS:	Linux
Kernel Version:	4.2.0-0.rc3.git2.2.fc22.i686	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	dmesg with drm.debug=0x1e xrandr output lspci output

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