Bug 92129 - [BSW] No output on internal laptop display
Summary: [BSW] No output on internal laptop display
Status: CLOSED FIXED
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Intel (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Intel GFX Bugs mailing list
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-09-26 17:26 UTC by M. G.
Modified: 2017-07-24 22:45 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

Attachments
dmesg with drm.debug=0x1e (114.68 KB, text/plain)
2015-09-26 17:26 UTC, M. G. 		no flags Details
View All

Description M. G. 2015-09-26 17:26:43 UTC 
Created attachment 118457 [details]
dmesg with drm.debug=0x1e

System architecture: x86_64
Kernel version: 4.1.6-alt460-amd64
Linux distribution: SystemRescueCd 4.6.0 (based on Gentoo Linux)
Machine: Acer TravelMate B116-M-P16S
Processor: Intel Pentium N3700
Display: Internal LCD (connected using eDP-1 according to /sys/class/drm/)

When the KMS driver loads I no longer see any output on the laptop screen (backlight remains on). Output via HDMI works.
The kernel log shows a warning about a timeout including back trace (see attached dmesg output with debug info).

The internal display only works if I add i915.modeset=0 to the boot options or if I boot an older kernel that doesn't use KMS.
The problem is reproducible with other kernel versions/distributions (e.g. Lubuntu 15.04 (Kernel 3.19.0)).
Comment 1 M. G. 2015-10-28 09:54:50 UTC 
Problem solved with kernel >=4.2.0.
Comment 2 Jani Nikula 2015-10-28 12:34:17 UTC 
(In reply to M. G. from comment #1)
> Problem solved with kernel >=4.2.0.

Thanks for the follow-up.

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.