[Bug 205649] New: Daisy Chain (MST) Session Crash after Screen Lock Resume

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=205649

            Bug ID: 205649
           Summary: Daisy Chain (MST) Session Crash after Screen Lock
                    Resume
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.4
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: michael at rauch.be
        Regression: No

Error message:
Nov 25 17:18:59 hoi kernel: [  664.616065] [drm] DM_MST: stopping TM on
aconnector: 00000000d2ec50d2 [id: 64]
Nov 25 17:19:03 hoi kernel: [  668.779501] [drm] DM_MST: Disabling connector:
0000000020957698 [id: 72] [master: 00000000d2ec50d2]
Nov 25 17:19:03 hoi kernel: [  668.780518] [drm] DM_MST: Disabling connector:
00000000a3e45904 [id: 67] [master: 00000000d2ec50d2]
Nov 25 17:19:03 hoi kernel: [  668.795264] [drm] DM_MST: starting TM on
aconnector: 00000000d2ec50d2 [id: 64]
Nov 25 17:19:03 hoi kernel: [  668.868743] [drm] DM_MST: added connector:
00000000a5e1fa4b [id: 84] [master: 00000000d2ec50d2]
Nov 25 17:19:03 hoi kernel: [  669.018055] [drm] DM_MST: added connector:
00000000a62ddae1 [id: 102] [master: 00000000d2ec50d2]
Nov 25 17:19:49 hoi kernel: [  715.510276] [drm] DM_MST: stopping TM on
aconnector: 00000000d2ec50d2 [id: 64]
Nov 25 17:19:54 hoi kernel: [  719.723556] [drm] DM_MST: Disabling connector:
00000000a62ddae1 [id: 102] [master: 00000000d2ec50d2]
Nov 25 17:19:54 hoi kernel: [  719.724562] [drm] DM_MST: Disabling connector:
00000000a5e1fa4b [id: 84] [master: 00000000d2ec50d2]
Nov 25 17:19:54 hoi kernel: [  719.738593] [drm] DM_MST: starting TM on
aconnector: 00000000d2ec50d2 [id: 64]
Nov 25 17:19:54 hoi kernel: [  719.799040] [drm] DM_MST: added connector:
0000000084594915 [id: 82] [master: 00000000d2ec50d2]
Nov 25 17:19:54 hoi kernel: [  719.944380] [drm] DM_MST: added connector:
000000007a6df593 [id: 111] [master: 00000000d2ec50d2]
Nov 25 17:27:56 hoi kernel: [ 1202.137752] [drm] DM_MST: stopping TM on
aconnector: 00000000d2ec50d2 [id: 64]
Nov 25 17:28:00 hoi kernel: [ 1206.380336] [drm] DM_MST: Disabling connector:
000000007a6df593 [id: 111] [master: 00000000d2ec50d2]
Nov 25 17:28:00 hoi kernel: [ 1206.381399] [drm] DM_MST: Disabling connector:
0000000084594915 [id: 82] [master: 00000000d2ec50d2]
Nov 25 17:28:00 hoi kernel: [ 1206.395858] [drm] DM_MST: starting TM on
aconnector: 00000000d2ec50d2 [id: 64]
Nov 25 17:28:00 hoi kernel: [ 1206.478238] [drm] DM_MST: added connector:
00000000e1e4c871 [id: 84] [master: 00000000d2ec50d2]
Nov 25 17:28:01 hoi kernel: [ 1206.628767] [drm] DM_MST: added connector:
00000000a3c8d4bc [id: 109] [master: 00000000d2ec50d2]


Setup:
2 monitors in Daisy Chain (MST) setup as separate displays


How to reproduce the issue:
1. Enable Screen Lock for a Gnome Session
2. Wake up the session after the monitors go to sleep


During the issue, the following occured:
1. Session crash for a running user session after wake up
2. User has to login to a new session


System specification:
Radeon PRO WX 2100
Ubuntu 18.04


I have tried the following combination:
Kernel 5.3, 5.4
Mesa 19.0.8


Let me know if more logfiles are needed

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