Sometimes graphics unresponsive

[trepseq]

Hello!

Today I got my new USB-DVI-Adapter with a Displaylink inside (HP NL571AA). After a couple of trials I found that my ubuntu 16.04 loads drivers for the adapter differently, in this ways:

a) Wait for boot up of computer, then connect the displaylink-adapter:

$ lsmod | grep udl
udl                    32768  0
drm_kms_helper        147456  3 udl,i915,evdi
drm                   364544  12 udl,i915,evdi,drm_kms_helper
$ lsmod | grep evdi
evdi                   40960  2
drm_kms_helper        147456  3 udl,i915,evdi
syscopyarea            16384  2 evdi,drm_kms_helper
sysfillrect            16384  2 evdi,drm_kms_helper
sysimgblt              16384  2 evdi,drm_kms_helper
drm                   364544  12 udl,i915,evdi,drm_kms_helper

Case a) results in the same responsiveness of mouse and graphical elements as when not using the adapter --> very good! Thank you for this adapter!

b) Connect the adapter with computer off, then start the computer:

$ lsmod | grep udl
udl                    32768  1
drm_kms_helper        147456  3 udl,i915,evdi
drm                   364544  10 udl,i915,evdi,drm_kms_helper
$ lsmod | grep evdi
evdi                   40960  0
drm_kms_helper        147456  3 udl,i915,evdi
syscopyarea            16384  2 evdi,drm_kms_helper
sysfillrect            16384  2 evdi,drm_kms_helper
sysimgblt              16384  2 evdi,drm_kms_helper
drm                   364544  10 udl,i915,evdi,drm_kms_helper

Case b) results in kind of a stucking responsiveness of mouse and graphical elements. Animations and mouse pointer run slower and not fluently. This happens only under this ciscumstances:
- I have a picture as desktop background
- the monitor connected to the displaylink-adapter is not fully covered by windows, so that parts of the picture can be seen.
If I choose a solid color background, the behaviour of b) is the same as a) (so everything is fine). If I maximize a window on the monitor connected to the displaylink-adapter, the behaviour of b) is also the same as a).

Unplugging the adapter in case b) results also in a crash of my X session, so I have to login again.
If I then disconnect the adapter and unload the module udl

sudo rmmod udl

and then reconnect the adapter again, these modules are loaded:

$ lsmod | grep udl
udl                    32768  0
drm_kms_helper        147456  3 udl,i915,evdi
drm                   364544  9 udl,i915,evdi,drm_kms_helper
$ lsmod | grep evdi
evdi                   40960  2
drm_kms_helper        147456  3 udl,i915,evdi
syscopyarea            16384  2 evdi,drm_kms_helper
sysfillrect            16384  2 evdi,drm_kms_helper
sysimgblt              16384  2 evdi,drm_kms_helper
drm                   364544  9 udl,i915,evdi,drm_kms_helper

Then the graphics and mouse pointer of the computer behave like in case a).

My question is: How can I make b) behave like a) without all the trouble?

I'm using ubuntu 16.04 with up-to-date packages and your driver in version 1.1.62.

Thank you for your help!