<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - two external screens permanently go blank on HP EliteBook Folio G1" href="https://bugs.freedesktop.org/show_bug.cgi?id=108462#c45">Comment # 45</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - 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 <a class="email" href="mailto:shtetldik@gmail.com" title="Shmerl <shtetldik@gmail.com>"> Shmerl</a> <pre>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/config/config">https://salsa.debian.org/kernel-team/linux/blob/debian/4.20-1_exp1/debian/config/config</a> Often the freeze is hard, and the only way to unfreeze it is Alt+SysRq+REISUB or complete hard reboot.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>