Bug#878221: linux-image-4.9.0-4-amd64: Screen flickers randomly with Radeon R9 270X since upgrade from 4.9.0-3 to 4.9.0-4

[Thomas Dünser]

HP E242 1920x1200 -> DisplayPort -> HP HP Elitebook 2540p

Same Problem/Same Fix:

Downgrade to Linux laptom 4.9.0-3-amd64 #1 SMP Debian 4.9.30-2+deb9u5