Red Hat Bugzilla – Bug 1466674
System crashes after docking
Last modified: 2017-10-10 08:58:32 EDT
Description of problem:
Since last friday (2017-06-23) system update (ask for dnf transaction log if needed) I am having serious problem whenever I dock my T460s laptop (two monitors connected to dock, one DVI, one display-port), problem happens only if I dock running/suspended system, if I reboot while docked everything works same as before. When connected running or woken up X freezes (probably, I can still move with cursor but everything else is frozen) and there is no signal to iether monitor. After few minutes system crashes and force reboots. I am NOT using wayland and my desktop runs xfce4.
Version-Release number of selected component (if applicable):
kernel.x86_64 - 4.11.6-201.fc25
xorg-x11-server-Xorg.x86_64 - 1.19.3-1.fc25
xorg-x11-drv-intel.x86_64 - 2.99.917-26.20160929.fc25
xfce4-session.x86_64 - 4.12.1-9.fc25
Steps to Reproduce:
1. Dock suspended laptop
2. Wake up
System crashes - force reboots
System recognizes connected monitors
After force reboot journalctl contains hundreds of times these two errors:
1. localhost.localdomain kernel: [drm:intel_dp_set_idle_link_train [i915]] *ERROR* Timed out waiting for DP idle patterns
2. localhost.localdomain kernel: [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting for DDI BUF C idle bit
they are appearing alternating 1.-2.-1. ... and sometimes 1.-1.-2.-1. ... about 4-5 times per second before crash. As for crash itself there is only "-- Reboot --" in journalctl; /var/log/messages contains 6795 chars of "^@". Please ask for any other specific info/logs.
Same problem on FC26, regardless if I use Wayland or X.org:
$ uname -a
Linux jpaulovi.usersys.redhat.com 4.11.11-300.fc26.x86_64 #1 SMP Mon Jul 17 16:32:11 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
$ rpm -qa | grep x11-drv
One more update - if I do a reboot even before re-docking it works normally (with multiple monitors as well). It is not good as workaround since full reboot is still required but maybe it can help with debugging/fixing this.
I am not sure whether this is correctly targeted against intel driver. I have removed the xorg-x11-drv-intel package entirely, thus forcing system to use modesetting driver included in Xorg server and the result are the same errors in log, though modesetting driver seems to handle them better so it does not crash on every re-dock. Please re-evaluate targeting.
Yes, that was the correct package, please see https://fedoraproject.org/wiki/KernelBugTriage#Video_Subsystem_bugs