Ubuntu
linux package

  1. Bug #1554613
  2. Comment #20

Comment 20 for bug 1554613

Revision history for this message
Eugene San (eugenesan) wrote : Re: screen flickering on XPS13 9350

I would like to add few observations:

1. Seems like the issue is Power Management related since I've never experienced it with AC adapter connected and sometimes almost instantly after disconnecting it, the flickering is started.

2. Sometimes first "flick" after reboot or PM change is accompanied with "[drm:intel_cpu_fifo_underrun_irq_handler [i915_bpo]] *ERROR* CPU pipe A FIFO underrun"

3. My dmesg is not as clean as the one provided by original reporter. It filled with quite a few bug/dump reports of i915 driver. Attaching my dmesg.log.

4. Once in a while, I find the computer in state which seems like a hardware "hang" but I suspect it's an i915 driver fault since sometimes after a prolonged wait the computer finally wakes up and later I find the errors mentioned in 3. Note those hangs can happen even if the computer is powered from AC and no automatic suspend is configured.

Seems like upstream bug report didn't get the attention it deserves, any ideas on how to assist with this bug(s) resolution?