[drm:drm_wait_vblank [drm]] *ERROR* Unsupported type value 0xA, supported mask 0xB

[ajl7]

regrets, but I am experiencing this problem as well.

setup:
Dell XPS 13 9350 with the Dell D3100 dock running Ubuntu 16.04 (4.4.0-38-generic)

DisplayLink Ubuntu Software Version: 1.2.58

to reproduce:

- plug in d3100 dock with external monitor attached via displaylink
- note monitor is enabled as secondary
- close top on laptop
- expect: external monitor becomes primary.

observed:
display not visible.

dmesg output completely spammed with messages like:

[10380.071195] [drm:drm_wait_vblank [drm]] *ERROR* Unsupported type value 0x1f3, supported mask 0x7400003f
[10380.071239] [drm:drm_wait_vblank [drm]] *ERROR* Unsupported type value 0x40001f3, supported mask 0x7400003f


imo, after reading the referenced defect reports, it may be a little bit of a reach to say this is a bug in the upstream. the scenarios referenced are all specific to the nouveau driver.


workaround is to leave laptop display open, I guess.