[drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO underrun

[Julian Wollrath <jwollrath@web.de>]

Hi,

on my Thinkpad X230 with an i5-3320M CPU (Intel HD 4000 Graphics) I get

[   14.256386] [drm] Initialized drm 1.1.0 20060810
[   14.994752] [drm] Memory usable by graphics device = 2048M
[   15.033559] [drm] Supports vblank timestamp caching Rev 2
(21.10.2013).
[   15.033560] [drm] Driver supports precise vblank timestamp query.
[   15.120501] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to
bit banging on pin 5
[   15.503091] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO
underrun
[   15.929629] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0
on minor 0
[   16.725847] [drm] Enabling RC6 states: RC6 on, RC6p on, RC6pp off

The error occurs during startup and resuming from suspend to disk with
the v3.15.1 kernel. On v3.14.4 this error did not occur.

What information should I also provide, so set you can make sense out of
this error?


Cheers,
Julian