Comment # 109 on bug 1188970 from Stefan Dirsch

So(In reply to guek wu neo from comment #87)
> The blacklisting of the udl modules helps user to complete the installation
> while the secondary displaylink monitor is attached. 
> 
> 
> However, it does not enable the displaylink monitor.
> 
> After installation, rebooting the system without boot parameter of
> 'module_blacklist=udl' does get the secondary displaylink monitor display
> turn on.

Ok. I think here the displayamnager GDM runs in Wayland mode (both monitors
working).

> But User will not be able to login to Desktop due to 'Wayland' as mentioned
> in comment#27.

For the session a Xserver is being started, which then fails due to
Displaylink. Xserver crashes.

> In summary, we looking to address 2 issues here
> (1) installation successful even with displaylink monitor attached
> (WORK OUT OF BOX without the manual interference of disable then enable udl
> module)
> 
> (2) login successful without Wayland. 
> (why Wayland a mandatory for server installation to support displaylink
> monitor?)

(2) is a followup to (1) due to Xserer crash with Displaylink. GDM login screen
still runs in Wayland mode.