R5 + 42.1 -> 1920x1200, no 4k

Hi,

I tried to install an MSI R5 230 on my linux system (Opensuse 42.1).
The monitor is a DELL 2710 (4k). The card should be able to handle
4k as well (using HDMI). However the system only shows 1920x1200.
Using the AMD driver (15.12) did not help.
Funny enough - I had an XFX R5 240 (which is broken now) working well with 4k
without any tricks.

Any idea ?

Bye, Peer

xrandr
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 16384 x 16384 <-----

DFP1 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 597mm x 336mm
1920x1200 59.9*+
1920x1080 50.0 60.0 59.9 24.0 50.0 60.1 24.0 60.0
1600x1200 60.0
1776x1000 50.0 59.9 24.0 50.0 60.0

p.p.s I used both. The free driver and now the AMD driver (seems to be more stable).