Comment 6 for bug 1599704

Happens to me too

Graphics: Card-1: Intel 4th Gen Core Processor Integrated Graphics Controller bus-ID: 00:02.0
           Card-2: Advanced Micro Devices [AMD/ATI] Mars XTX [Radeon HD 8790M] bus-ID: 01:00.0
           Display Server: X.Org 1.18.4 drivers: ati,radeon,intel (unloaded: fbdev,vesa)
           Resolution: 1920x1080@60.01hz, 2560x1440@59.95hz
           GLX Renderer: Mesa DRI Intel Haswell Mobile GLX Version: 3.0 Mesa 11.2.0 Direct Rendering: Yes

Only works after turning the external screen on and off several times...

Didn't try to upgrade the kernel manually yet, hopefully there's a better more official solution.

Any plans for a maintainer to have this bug assigned?