[Bug 100444] New: VT switch broken with 4.11-rc4 kernel with an external monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100444

            Bug ID: 100444
           Summary: VT switch broken with 4.11-rc4 kernel with an external
                    monitor
           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: tiwai at suse.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Originally reported to openSUSE bugzilla:
  https://bugzilla.opensuse.org/show_bug.cgi?id=1031462

The i915 in 4.11-rc kernel seems to have a regression regarding VT switch.
When the machine is booted with an external monitor (HDMI or DP), the mode is
set on both eDP and HDMI/DP, then switching to VT1 from X leads to the frozen
screen.

It's not really a crash but likely the atomic modeset failure like bsc#1018358,
as you can go back to X via alt-F7 again.

The 4.10 kernel works fine, so it's a regression.  The problem is reproduced on
Dell E7270 laptop with Skylake chip.

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