Hello, ever since update from Ubuntu 17.10 to 18.04 i having quite strange problem which nobody in Ubuntu community seems to can help me with.
Basically, everything is working fine for one user logged in in system and going nuts if there is second.
After boot i get to lightDm login screen - all fine, after login - all fine, no problems. I have desktop extended over two monitors (i have two, but one or two connected is not important, same effect even with one disconnected)
Click Switch User - LightDM login again and both monitors reverts to 640x480 resolution.
Afer login second user present with desktop with too 640x480 on both screens, both shows mirrored picture. Nvidia-settings dont see any nvidia card if started by second user.
If i log out first user with second still logged in - second still will have lowres session. If i log out second one and login him back he will get working fullres session, and if i now login first one his session will be lowres.
To cut short - only first and only one logged in will have normal resolution, next is broken.
Needless to say that in Ubuntu 17.10 with nvidia-384 there is no problem as wee no such problem with nouveau.
$ nvidia-settings ERROR: Unable to load info from any available system
lspci -k | grep -EA2 'VGA|3D' 01:00.0 VGA compatible controller: NVIDIA Corporation GM107 [GeForce GTX 750 Ti] (rev a2) Subsystem: ASUSTeK Computer Inc. GM107 [GeForce GTX 750 Ti] Kernel driver in use: nvidia
== /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0 == modalias : pci:v000010DEd00001380sv00001043sd000084DDbc03sc00i00 vendor : NVIDIA Corporation model : GM107 [GeForce GTX 750 Ti] driver : nvidia-driver-390 - distro non-free recommended driver : nvidia-340 - distro non-free driver : xserver-xorg-video-nouveau - distro free builtin
Driver used is repository provided one, currently 390.87 with all its dep. I have treid 396 series from https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa/+packages - same effect absolutely.
This bug is somethat similar to https://devtalk.nvidia.com/default/topic/1042864/nvidia-396-low-res-on-ubuntu-18-04-no-secondary-monitor-after-installing-cuda-toolkit-9-2/?offset=3 but i dont have anythign to do with CUDA.
nvidia-bug-report.log.gz (150 KB)