Ubuntu
linux package

  1. Bug #1971428
  2. Comment #5

Comment 5 for bug 1971428

Revision history for this message
Alexander Lazarević (e11bits) wrote :

Same here on Lenovo Thinkpad T490 with i915 and external monitor attached via Thunderbolt. External monitor goes black several times a day.

Only when I move the mouse cursor into the lower 10% part of the monitor screen. It stays black if I don't move the mouse. Once I move the mouse, the screen comes back. It does not always happen in that lower 10% part. But when it happens, the cursor is in that area.

Around that time I see in dmesg:
i915 0000:00:02.0: [drm] *ERROR* CPU pipe B FIFO underrun

I tried a fix from here:
https://bbs.archlinux.org/viewtopic.php?id=263720

But adding the kernel parameter intel_idle.max_cstate=4 did not help in my case.