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
** Changed in: xorg (Ubuntu)
Status: Incomplete => New
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https://bugs.launchpad.net/bugs/1550779
Title:
[i915]] *ERROR* CPU pipe A FIFO underrun - Xorg glitches
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