[Bug 97889] New: Only half of the screen visible

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97889

            Bug ID: 97889
           Summary: Only half of the screen visible
           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: pmenzel at molgen.mpg.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 126703
  --> https://bugs.freedesktop.org/attachment.cgi?id=126703&action=edit
Output of `dmesg`

Using Linux 4.8-rc7 on a Sky Lake system, since installing the GUC and DMC
firmware BLOBs [1], the Dell monitor sometimes only shows the right half of the
picture. The left part stays black. The monitor is connected using DisplayPort,
and it’s reproducible with both ports.

A reboot doesn’t fix it, and only half of the image is seen during the firmware
stage (UEFI), and bootloader (GRUB) too.

Only turning the monitor off and back on fixes the problem. I attach the Linux
messages, but as this happens also during non-Linux stages, I assume it’s a
hardware problem.

It only starts happening though, once GDM is started, and then the problem
stays, until the monitor is turned off and back on.

That means, today, turning on the system, firmware (UEFI), GRUB, and Linux
messages were shown just fine, but starting GDM, only half of the screen was
visible. Turning the monitor off and back on, fixed it.

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


[1] https://01.org/linuxgraphics/intel-linux-graphics-firmwares

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