[Bug 97666] New: Kernel "NULL pointer dereference" with MST monitor on HSW
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Thu Sep 8 19:28:03 UTC 2016
https://bugs.freedesktop.org/show_bug.cgi?id=97666
Bug ID: 97666
Summary: Kernel "NULL pointer dereference" with MST monitor on
HSW
Product: DRI
Version: XOrg git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: DRM/Intel
Assignee: intel-gfx-bugs at lists.freedesktop.org
Reporter: kirill at shutemov.name
QA Contact: intel-gfx-bugs at lists.freedesktop.org
CC: intel-gfx-bugs at lists.freedesktop.org
Created attachment 126335
--> https://bugs.freedesktop.org/attachment.cgi?id=126335&action=edit
dmesg with drm.debug=0xe
Steps to reproduce:
1. Boot machine (Haswell, also saw on Skylake) with MST monitor (Dell UP2414Q,
DP1.2 enabled) attached. It boots fine.
2. Disable the monitor with button on front.
3. Re-enable the monitor. Nothing appears on the screen. It goes to sleep.
4. Switch to linux console (C-A-F1) and back. It brings the monitor back alive.
5. Switch to linux console again. Kernel crashes.
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