Created attachment 144856 [details]
dmesg with drm.debug=0x1e log_buf=4M (drm-tip 2019-07-23)
Original bugreport: Bug 103229
Relevant bugreport: Bug 108462
As described in Comment 55 of original bugreport, issue is still reproducible on HP EliteBook Folio G1, but now happen only after suspend / resume cycle.
In attached log (dmesg with drm.debug=0x1e log_buf=4M on cod/tip/drm-tip/2019-07-23 ec297a234e92aa258bba523320898f408d0cf147) I suspend and resume laptop once, switched between windowed and fullscreen mode on YouTube in Firefox, launched mc and exited from mc few times, back to Firefox, switched to fullscreen YouTube again, got flickering.
1. Imre workaround from https://bugs.freedesktop.org/show_bug.cgi?id=108462#c18
Considering the scenario and workarounds, setting the priority of this bug to Medium.
Hi, I am using kernel 5.3.4 with those boot options (with no success - still happening):
but still occasionally I get:
[15807.397665] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
and my external attached display port monitor on the dock is going black (only the left one, the right one stays ok) and about 1-2 seconds l8r picture is there again.
Anything else I can provide or try to get rid of those flicker / black screen?
I am using a:
[ 23.830912] thinkpad_acpi: ThinkPad BIOS N22ET35W (1.12 ), EC N22HT22W
[ 23.830913] thinkpad_acpi: Lenovo ThinkPad T480s, model 20L7001LGE
with the integrated card:
VGA compatible controller: Intel Corporation UHD Graphics 620 (rev 07)
Torsten, your bug is Bug 108462