[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 #54 from Karthik B S <karthik.b.s at intel.com> ---
(In reply to Shmerl from comment #45)
> 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.

Yet to try this out on Kabylake, will check it with the mentioned config and
get back.

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