[Bug 100973] New: [SKL][Regression] Dell monitor stays black until GDM restart

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100973

            Bug ID: 100973
           Summary: [SKL][Regression] Dell monitor stays black until GDM
                    restart
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: pmenzel at molgen.mpg.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 131263
  --> https://bugs.freedesktop.org/attachment.cgi?id=131263&action=edit
journalctl -k -o short-precise

Testing Linux 4.11, there is a regression compared to Linux 4.9.25 and
4.11-rc5. The hardware is HD Graphics 530 and a Dell UP3214Q monitor.

Not even the Linux messages can be seen in the beginning. Restarting GDM with
`sudo systemctl restart gdm.service` didn’t help, and the monitor seems to be
stuck in a state, where it has to be forcefully powered off by pressing the
power button for ten seconds, and then turning it back on. Then it goes into
power saving mode, and then restarting GDM works.

```
$ lspci -s 0:02.0 -nn
00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 530
[8086:1912] (rev 06)
```

Please find the Linux messages with `drm.debug=0x1e` attached [1].


[1] https://01.org/linuxgraphics/documentation/how-report-bugs

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