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. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1971428 Title: CPU pipe A FIFO underrun To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1971428/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
