From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julian Wollrath <jwollrath@web.de>
Subject: Re: [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A
 FIFO underrun
Date: Tue, 17 Jun 2014 15:41:24 +0200
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References: <20140617144030.2585cb9b@saldaea>
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Hi,

I just checked v3.16.0-rc1. There I get an additional error:
[   15.266373] [drm] Initialized drm 1.1.0 20060810
[   15.773818] [drm] Memory usable by graphics device = 2048M
[   15.779773] [drm] Supports vblank timestamp caching Rev 2
(21.10.2013).
[   15.033559] [drm] Driver supports precise vblank timestamp query.
[   15.866766] [drm] GMBUS [i915 gmbus dpb] timed out, falling back to
bit banging on pin 5
[   16.160259] [drm:cpt_set_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder A
[   16.160260] [drm:cpt_serr_int_handler] *ERROR* PCH transcoder A FIFO
underrun
[   16.674873] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0
on minor 0
[   17.722301] [drm] Enabling RC6 states: RC6 on, RC6p on, RC6pp off

Cheers,
Julian

Am Tue, 17 Jun 2014 14:40:30 +0200
schrieb 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