External display not working at full resolution 1920x1080

Bug #1591687 reported by Ulrich Hobelmann on 2016-06-12
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Linux Mint
New
Undecided
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Bug Description

This is a regression from Linux Mint 17.3 to 18.

I have a Thinkpad (x220) + Docking station, and an extra monitor plugged in.

With Linux Mint 18, the external display seems to work with lower resolutions, but not at the native 1920x1080. The picture will show for a fraction of a second, and show black for a long time. Sometimes the picture will return for a fraction of a second.

If I turn OFF the laptop display and only use the external one, I can sometimes convince it to run full resolution, but it will flicker sometimes or show a black screen for 10 seconds and then return the picture.

Graphics is internal Intel.

Desktop is MATE, by the way.

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