Bug 92129

Summary:

[BSW] No output on internal laptop display

Product:

DRI

Reporter:

M. G. <gentoo>

Component:

DRM/Intel

Assignee:

Intel GFX Bugs mailing list <intel-gfx-bugs>

Status:

CLOSED FIXED

QA Contact:

Intel GFX Bugs mailing list <intel-gfx-bugs>

Severity:

normal

Priority:

medium

CC:

intel-gfx-bugs

Version:

unspecified

Hardware:

x86-64 (AMD64)

OS:

Linux (All)

Whiteboard:

i915 platform:

i915 features:

Attachments:

Description	Flags
dmesg with drm.debug=0x1e	none

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.

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