[Bug 108462] two external screens permanently go blank on HP EliteBook Folio G1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108462

--- Comment #45 from Shmerl <shtetldik at gmail.com> ---
I have a seemingly related bug, when switching to tty causes system to hang for
some period of time. Sometimes tty comes up, and you can see

[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun

in dmesg.

Configuration:
Dell Latitude 7490
GPU: Intel UHD Graphics 620 (Kabylake GT2).
Kernel: 4.20.0-trunk-amd64 (from Debian experimental).

Displays: 2 external monitors, one connected over USB-C (display port
connection), and other daisy chained from the first through DisplayPort cable.
I keep laptop screen off, so using only two external monitors (KDE Plasma
5.14.5).

You can find config here:
https://salsa.debian.org/kernel-team/linux/blob/debian/4.20-1_exp1/debian/config/config

Often the freeze is hard, and the only way to unfreeze it is Alt+SysRq+REISUB
or complete hard reboot.

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