https://bugs.kde.org/show_bug.cgi?id=368746
Bug ID: 368746
Summary: System does not allow to enable external monitor after
plugging into dock and crashes after unplug
Product: kde
Version: unspecified
Platform: Kubuntu Packages
OS: Linux
Status: UNCONFIRMED
Severity: major
Priority: NOR
Component: dualhead
Assignee: unassigned-b...@kde.org
Reporter: andreas.huels...@googlemail.com
OS:
Linux (x86_64) release 4.4.0-36-generic
KUbuntu 16.04.1 LTS
System:
Lenovo ThinkPad X240, model 20AMS21B00
(graphics chip: Haswell-ULT Integrated Graphics Controller, driver: i915)
Lenovo ThinkPad Pro Dock Type 40A1
Error:
When I plug the running system into my docking station, the system seems to
detect everything fine: External USB drive is auto-mounted, LAN interface
works, external keyboard and mouse work. Also, xrandr & systemsettings detect
the external monitor which is connected to the DVI port of the dock. However,
the external screen is not activated.
Trying to enable the second screen via systemsettings makes the application
hang and it only recovers after reverting the settings using the "external
screen key" on the key board.
After restarting the system / logging off it suddenly works: I can activate the
external screen via systemsettings. When I make it the primary display, the
kde-dock sometimes does not switch to the primary display but this works after
changing the configuration a few times.
Strangely, when I plug-in a beamer on the VGA port of the laptop, I can
activate it without logging out / restart.
However, if I unplug the beamer from the VGA port or unplug the laptop from the
dock, it crashes and only manually powering off the system works.
The issue occurs every time I do the above.
The same system configuration worked perfectly fine with KUbuntu 14.04 LTS
Reproducible: Always
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