<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <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 <a class="email" href="mailto:karthik.b.s@intel.com" title="Karthik B S <karthik.b.s@intel.com>"> Karthik B S</a> <pre>(In reply to Shmerl from <a href="show_bug.cgi?id=108462#c45">comment #45</a>) > 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. Yet to try this out on Kabylake, will check it with the mentioned config and get back.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>