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[Testbed]
Hardware:
A Haswell platform laptop with an Amd Radeon R7 M265 graphics card. Connect an
external monitor via HDMI port.
Software:
Ubuntu 14.04
xserver-xorg-video-intel 2:2.99.910-0ubuntu1.1
[Reproducer]
1. Press FN + hot key to change the display mode.
2. Watching the built-in monitor.
[Expect result]
there should be 4 modes:
Internal only -> extended mode -> mirror mode -> external only
[Actual result]
mirror-mode -> extended mode -> *black mode*[1] twice -> mirror mode ->
internal only -> external only
[1]: black mode means, the screen is black, backlight works well.
Nothing displayed. Only cursor showed. It moves if I touch my mouse.
[How reproducible]
100% with my laptop.
[old version?]
after downgrade to xserver-xorg-video-intel 2:2.99.910-0ubuntu1, the issue can
not be reproduced. So I suppose it's a regression issue.
** Affects: xorg (Ubuntu)
Importance: Low
Status: Incomplete
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unexpected black screen when changing display mode.
https://bugs.launchpad.net/bugs/1382494
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