Hello Peter,

I am using the same docking station and had the same problem.
I currently am on the latest Fedora kernel and this has not been fixed yet, I believe. I think it will take some time until it's included in Fedora and tested before it makes it to RHEL but I will make sure that a BugZilla exists so this is tracked.

If it helps, I'm currently using a workaround which is not perfect, but it works.
I am simply manually extending the resolution of my secondary display to be big enough to cover both of my screens (1920x2). This is my xrandr output:

Screen 0: minimum 320 x 200, current 3840 x 1848, maximum 8192 x 8192
eDP1 connected 1366x768+1259+1080 (normal left inverted right x axis y axis) 277mm x 156mm
1366x768 60.00+
1024x768 60.00
800x600 60.32 56.25
640x480 59.94
DP2 connected primary 3840x1080+0+0 (normal left inverted right x axis y axis) 477mm x 268mm
1920x1080 60.00 +
3840x1080 60.00
2560x1024 60.00
1600x1200 60.00
1680x1050 59.95
1280x1024 75.02 60.02
1440x900 74.98 59.89
1280x960 60.00
1280x800 59.81
1152x864 75.00
1024x768 75.08 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 60.00
720x400 70.08

So eDP1 is my laptopt's screen, while DP2 is the secondary output, on which I'm using a resolution of 3840x1080.
To achieve this I think all I had to do was to:

• Run xrandr to identify which one is my second output (in this case DP2)
• Force a resolution to that output:
  xrandr --output DP2 --mode 3840x1080

I know this is not ideal but it might help while the patch gets included in the kernel.