[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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