418.56, GTX 1050 TI mobile, Dell XPS, 4.19.34-1-lts, RmInitAdapter failed!

I am trying to launch a program via optirum. The same error happens using nvidia-smi.

Actually, GPU had been working for a while and stopped working after some kernel + driver update.

➜  tmp git:(master) ✗ cat /proc/driver/nvidia/gpus/0000\:01\:00.0/information
Model:           Unknown
IRQ:             16
GPU UUID:        GPU-????????-????-????-????-????????????
Video BIOS:      ??.??.??.??.??
Bus Type:        PCIe
DMA Size:        47 bits
DMA Mask:        0x7fffffffffff
Bus Location:    0000:01:00.0
Device Minor:    0
Blacklisted:     No
[ 1321.722194] NVRM: RmInitAdapter failed! (0x26:0xffff:1106)
[ 1321.722239] NVRM: rm_init_adapter failed for device bearing minor number 0

This error looks suspicious to me, but I don’t know what it means:

[   396.458] (EE) /dev/dri/card0: failed to set DRM interface version 1.4: Permission denied
[   396.459] (--) PCI:*(1@0:0:0) 10de:1c8c:1028:087c rev 161, Mem @ 0xec000000/16777216, 0xc0000000/268435456, 0xd0000000/33554432, I/O @ 0x00003000/128, BIOS @ 0x????????/524288