Running Ubuntu 18, on a Thinkpad E590, connected to a Thinkpad USB-C Dock, which is then connected, via DisplayPort to an Ultrawide monitor.
This monitor's native resolution is 3840x1600 @ 60hz.
This set up works perfectly fine in Windows 10; I get the resolution and I get the refresh rate of 60.
In Ubuntu, I can only get the external monitor to run at 29.99hz, even though 59.99 is an available option in xrandr:
Output of xrandr:
Code:
DP-1-2 connected 3840x1600+1920+0 (normal left inverted right x axis y axis) 874mm x 366mm
3840x1600 59.99 + 29.99*
3440x1440 75.05 59.97
2560x1080 50.00
1920x1080 74.99 60.00 60.00 50.00 59.94
1680x1050 59.95
1600x900 60.00
1280x1024 75.02 60.02
1280x800 59.81
1152x864 75.00 59.97
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
832x624 74.55
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
So you can see 59.99 is reported as an available rate, but...
Code:
xrandr --output DP-1-2 --mode 3840x1600 --rate 59.99
doesn't change the rate; it stays on 29.99 and reports:
Code:
xrandr: Configure crtc 1 failed
xorg.log shows:
Code:
4395.610] (EE) modeset(0): failed to set mode: No space left on device
[ 4398.303] (II) modeset(0): EDID vendor "LEN", prod id 16570
[ 4398.303] (II) modeset(0): Printing DDC gathered Modelines:
[ 4398.303] (II) modeset(0): Modeline "1920x1080"x0.0 138.60 1920 1968 2000 2080 1080 1083 1088 1111 -hsync -vsync (66.6 kHz eP)
[ 4398.303] (II) modeset(0): Modeline "1920x1080"x0.0 110.88 1920 1968 2000 2080 1080 1083 1088 1111 -hsync -vsync (53.3 kHz e)
I would accept that the 59.99 isn't supported if it didn't show in xrandr... but it does!
I have updated the Thinkpad dock to the latest firmware, and also installed the latest DisplayLink drivers from
https://www.displaylink.com/downloads/ubuntu - but the additional libraries as suggested on
https://support.displaylink.com/know...ware-on-ubuntu didn't install - libraries not found, but thinking these are obsolete now on Ubuntu 18?
Also, after initial setup, I experienced screen flickering with the dock, so disabled PageFlip as per
https://support.displaylink.com/know...ent-x-upgrades
Any suggestions, most appreciated.
Thanks