Bug#1125785: kernel option `nouveau.config=NvGspRm=0` also helps

[Al Ma]

A connected DVI cable without a monitor on the other end turned out to be unrelated; unplugging it didn't help.

Alternatively to disable Wayland, it helps if we leave Wayland enabled in /etc/gdm3/daemon.conf but add the kernel option `nouveau.config=NvGspRm=0`:

$ grep Wayland /etc/gdm3/daemon.conf
#WaylandEnable=false
$ grep CMD /etc/default/grub
GRUB_CMDLINE_LINUX="nouveau.config=NvGspRm=0"

However, this way we get a ton of repeated errors in the journal, which gets really noisy and distracting due to the repeated

nouveau 0000:65:00.0: gr: DATA_ERROR 0000009c [] ch 6 [017f886000 gnome-shell[2361]] subc 0 class c597 mthd 0d78 data 00000004

The next upgrade would have to deal with a nondefault config file – be it /etc/gdm3/daemon.conf or /etc/default/grub – so errors may occur during upgrade. So I believe a better/proper fix from the authors/maintainers is needed.

Temporarily, we switch to XOrg – simply because if we hit another error, we have a cleaner log to analyze and an option we understand.
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