** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Incomplete = New
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https://bugs.launchpad.net/bugs/1488409
Title:
[MacbookPro11,2] Using
Public bug reported:
Prior to install Wily Werewolf I could use external displays - including
an Apple Cinema 27 (mini DisplayPort) and various projectors (Mini-DP to
VGA). Since installing Wily external displays show corrupted visuals.
For instance right now, when I plug in an Apple Cinema 27
I don't still have the old kernel. However if I boot the laptop with an
Ubuntu 15.04 Desktop amd64 USB stick then both the Apple Cinema 27 and
the Panasonic television are detected and display a stable picture.
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which is
Two more data points:
1. The mini-dp monitor works correctly if it's plugged in at boot time. It
continues to work after suspend/resume and disconnect/reconnect.
2. I tried booting
linux-image-4.2.0-040200rc8-generic_4.2.0-040200rc8.201508240030 and it
exhibits the same flickering/corruption
This behaviour is still present with kernel 4.2.0-7-generic - when an
external display is connected the desktop becomes incorrect
tiled/scaled, and the displays rapidly (~10 Hz) flicker.
Having the external display (Apple Cinema 27) plugged in during boot is
no longer a reliable workaround.
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