Public bug reported:
Using a Thinpad T420s, after upgrading to Ubuntu 16.04, I sometimes
encounter a heavy problem:
The internal screen is frequently blanking and comes up with other
resolutions. This mostly triggers after resuming from standby.
Using xrandr, I figured out that there are too many display devices
listed, and one of them, named VGA2, is intermittently thought to be
connected, so it is automatically acitvated and the screen layout
adapts, also changing the internal screen resolution (a clone view setup
I guess).
In reality, there are no devices, cables or adapters attached to any
display output (there is only one VGA and one DisplayPort output).
If bug kicks in, the computer is almost unusable, permanently switching
the screen layout every few seconds. The bug cannot be undone by
restarting Xorg and also holds after rebooting the machine.
It can be fixed by power cycling the machine.
** Affects: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "xrandr output"
https://bugs.launchpad.net/bugs/1640781/+attachment/4775299/+files/xrandr.txt
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https://bugs.launchpad.net/bugs/1640781
Title:
Constant surplus display device detection and switching
Status in xserver-xorg-video-intel package in Ubuntu:
New
Bug description:
Using a Thinpad T420s, after upgrading to Ubuntu 16.04, I sometimes
encounter a heavy problem:
The internal screen is frequently blanking and comes up with other
resolutions. This mostly triggers after resuming from standby.
Using xrandr, I figured out that there are too many display devices
listed, and one of them, named VGA2, is intermittently thought to be
connected, so it is automatically acitvated and the screen layout
adapts, also changing the internal screen resolution (a clone view
setup I guess).
In reality, there are no devices, cables or adapters attached to any
display output (there is only one VGA and one DisplayPort output).
If bug kicks in, the computer is almost unusable, permanently
switching the screen layout every few seconds. The bug cannot be
undone by restarting Xorg and also holds after rebooting the machine.
It can be fixed by power cycling the machine.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1640781/+subscriptions
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