I recently upgraded my NVidia driver to 390.48 and I get an anomalous behaviour when trying to suspend the machine.
The screen becomes black (monitor says : no signal) but the machine does not actually go into suspend mode ; it is also impossible to get it back to normal operation (AltSysRq REISUB works to reboot).
Inspection of journalctl shows
nvidia-modeset: ERROR: GPU:0: Display engine push buffer channel allocation failed: 0x65 (Call timed out [NV_ERR_TIMEOUT]) nvidia-modeset: ERROR: GPU:0: Failed to allocate display engine core DMA push buffer kernel: BUG: unable to handle kernel NULL pointer dereference at 0000000000000070 kernel: IP: [<ffffffffc20619ae>] _nv002366kms+0x5e/0x100 [nvidia_modeset]
Attached are the full journalctl from previous boot (the one when I tried to suspend) as well as the result of nvidia-bug-report.sh.