screen updates one step behind user input on DisplayLink monitor

mab · 03-30-2017, 04:23 PM

When using the modesetting driver, screen updates on the monitor connected to the DisplayLink adapter stay one step behind user input. For example, if I type a letter, it's not shown on the screen until I type a second letter or nudge the mouse.

Ubuntu recently made modesetting the default driver (without xorg.conf), so it took me a while to figure what changed to cause this problem, which I didn't have with earlier Ubuntu releases. The problem doesn't occur with the Intel driver, which I can force with this xorg.conf file:

Code:

Section "Device"
        Identifier "Intel"                                                                                                                  
        Driver "intel"                                                                                                                      
EndSection

Does anybody know what's going on or what to do about it?

Ubuntu 16.10
kernel 4.10.7-041007-generic
Dell XPS 13
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
Bus 004 Device 002: ID 17e9:4324 DisplayLink
monitor: Dell U27 13 HM
res: 2560x1440
displaylink-driver-1.3.52

03-30-2017, 04:23 PM	#1
mab Junior Member Join Date: Feb 2017 Posts: 2	screen updates one step behind user input on DisplayLink monitor When using the modesetting driver, screen updates on the monitor connected to the DisplayLink adapter stay one step behind user input. For example, if I type a letter, it's not shown on the screen until I type a second letter or nudge the mouse. Ubuntu recently made modesetting the default driver (without xorg.conf), so it took me a while to figure what changed to cause this problem, which I didn't have with earlier Ubuntu releases. The problem doesn't occur with the Intel driver, which I can force with this xorg.conf file: Code: Section "Device" Identifier "Intel" Driver "intel" EndSection Does anybody know what's going on or what to do about it? Ubuntu 16.10 kernel 4.10.7-041007-generic Dell XPS 13 00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09) Bus 004 Device 002: ID 17e9:4324 DisplayLink monitor: Dell U27 13 HM res: 2560x1440 displaylink-driver-1.3.52