Bug#810120: linux-image-3.16.0-4-amd64: i915 drm, dualscreen, FIFO underrun, kernel call trace

[Hans Meiser]

I recently installed a backported linux image:
> linux-image-4.3.0-0.bpo.1-686-pae

with this the crashes do no occure

Only things which occure are those FIFO underruns:
> [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder B 
> FIFO underrun
they don't seem fatal.

Regards.

Bug#810120: linux-image-3.16.0-4-amd64: i915 drm, dualscreen, FIFO underrun, kernel call trace

[Hans Meiser]

Some more details:

* the distorted X11 screen on output LVDS1 seems only to happen with
simple window-managers like fvwm2 and jwm, but not with a
desktop-environment xfce.

This is bad because I have not found a replacement for fvwm2, which is
as configurable like fvwm2. I use fvwm2 constantly.

* Also this Problem occures, when using VGA1 instead of DP1. :(

Regards.


2016-01-06 16:40 GMT+01:00, x201-user :
> Package: src:linux
> Version: 3.16.7-ckt20-1+deb8u2
> Severity: important
>
> Dear Maintainer,
>
> ** What led up to the situation?
> Installing a plain debian jessie on a Laptop Lenovo X201,
> connecting a external screen and
> boot the system.
>
>
> ** How to reproduce on running system:
> 1.) enable second screen
> xrandr --output LVDS1 --auto --primary --output DP1 --auto --above LVDS1
> 2.) Switch screens via dpms to off
> xset dpms force off
> 3.) move mouse to awake screens and look into dmesg to see kernel call
> trace
>  ...