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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - two external screens permanently go blank on HP EliteBook Folio G1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108462#c54">Comment # 54</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - two external screens permanently go blank on HP EliteBook Folio G1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=108462">bug 108462</a>
from <span class="vcard"><a class="email" href="mailto:karthik.b.s@intel.com" title="Karthik B S <karthik.b.s@intel.com>"> <span class="fn">Karthik B S</span></a>
</span></b>
<pre>(In reply to Shmerl from <a href="show_bug.cgi?id=108462#c45">comment #45</a>)
<span class="quote">> 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:
> <a href="https://salsa.debian.org/kernel-team/linux/blob/debian/4.20-1_exp1/debian/">https://salsa.debian.org/kernel-team/linux/blob/debian/4.20-1_exp1/debian/</a>
> config/config
>
> Often the freeze is hard, and the only way to unfreeze it is
> Alt+SysRq+REISUB or complete hard reboot.</span >
Yet to try this out on Kabylake, will check it with the mentioned config and
get back.</pre>
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