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  1. Bug #1550779
  2. Comment #7

Comment 7 for bug 1550779

Revision history for this message
Hubert Hesse (hubx) wrote : Re: [i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches

Ah, thanks for pointing out the BIOS update. However it didn't change anything related to the issue.

$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
8DET70WW (1.40 )
05/14/2015

The flickering is also present for me in the latest mainline
$uname -a
Linux river 4.4.3-040403-generic #201602251634 SMP Thu Feb 25 21:36:25 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
$ dmesg | grep i915
[ 2.538980] i915: unknown parameter 'lvds_downclock' ignored
[ 2.778824] [drm] Initialized i915 1.6.0 20151010 for 0000:00:02.0 on minor 0
[ 4.319937] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 69.185831] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[ 69.186167] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
[ 69.186184] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun

since lvds_downclock is mentioned I wanted to point out my power saving options:
$ cat /etc/modprobe.d/i915.conf
options i915 enable_rc6=1 enable_fbc=1 lvds_downclock=1 semaphores=1

However removing them doesn't change anything