Well at least here on nvidia-755m if nvidia_drm modeset is enabled gdm3 fails
to boot.
However lightdm works fine & prime sync is enabled..
$ sudo cat /sys/module/nvidia_drm/parameters/modeset
[sudo] password for doug:
Y
doug@doug-Lenovo-IdeaPad-Y510P:~$ xrandr --verbose
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
eDP-1-1 connected primary 1920x1080+0+0 (0x46) normal (normal left inverted
right x axis y axis) 345mm x 194mm
Identifier: 0x42
Timestamp: 11726
Subpixel: unknown
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 0 1 2
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID:
00ffffffffffff0030e4d90200000000
00150103802313780a15d59e59509826
0e505400000001010101010101010101
0101010101017e3680b070381f403020
350059c2100000190000000000000000
00000000000000000000000000fe004c
4720446973706c61790a2020000000fe
004c503135365746312d544c4232004b
PRIME Synchronization: 1
supported: 0, 1
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https://bugs.launchpad.net/bugs/1752739
Title:
PRIME Synchronization doesn't work with linux-kernel 4.15.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-390/+bug/1752739/+subscriptions
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