[Bug 109402] New: modeset(0): failed to set mode: No such file or directory

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109402

            Bug ID: 109402
           Summary: modeset(0): failed to set mode: No such file or
                    directory
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (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 143174
  --> https://bugs.freedesktop.org/attachment.cgi?id=143174&action=edit
Xorg.0.lo

System is Thinkpad T460p with external display attached over DisplayPort.
Kernel is v5.0-rc2. Xorg is 1.20.3.

Xorg starts normally, but if external display gets through power cycle
switching to console and back leads to Xorg crash with "modeset(0): failed to
set mode: No such file or directory". See attached log.

The external display is Dell UP2414Q, which is 4k, but the bug can be
reproduced with MST disabled too.

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