Red Hat Bugzilla – Bug 1475810
drm:intel_set_cpu_fifo_underrun_reporting freezes Thinkpad x200 tablet when external display is connected via Display port
Last modified: 2018-05-03 04:34:06 EDT
Created attachment 1305345 [details]
dump of the kernel
Description of problem:
I own an old Thinkpad x200 (the tablet edition if it matters) and the docking station for this model, which features a display port (the notebook itself does not have a display port connector). When I connect an external monitor via display port, the machine completely freezes after ~15-120 minutes when left untouched. When it is in use, it does not freeze.
I have had this issue already about a year ago, but did not know how to report it. It might therefore be, that this problem has been present for quite some time, especially considering the necessary setup to cause the problem.
I have checked the system log and attached about 5 minutes before the system's freeze, which contain a kernel dump.
Also, please note that the freezing does not occur, when no display is connected.
Version-Release number of selected component (if applicable):
kernel: Linux Eclipse 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
Usually happens when a display port monitor is connected via the docking station and the machine is left untouched for an extended period of time (I guess at least 10-15 minutes are necessary, but I have not tested this thoroughly, just a guess).
Steps to Reproduce:
1. Get an thinkpad x200t, a docking station and a display port cable + monitor
2. Connect the Monitor to the docking station and extend the screen onto it
3. Go for lunch and don't touch the machine during that time.
The machine is completely frozen, no input is registered and networking is down too.
The machine should be still usable.
The journald log output is attached.
Since the machine was unlocked, the clock on my screen indicated the time of the freeze, which was 13:43:35 (it only updates once every 5 seconds). The attached log starts at 13:35 and ends with the reboot at 13:49.
Moving to have the graphics team take a look
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