After suspend external monitor (IIYAMA PL2492H) over HDMI not working - in system it looking like ok, but in real - it have black screen in powersave mode.
Nothing can awake it (alt+f7, alt+f2 not helping, also all stuff what found in internet not helped, 1 wasted week for it … )
Only cold reboot (with power off) will help, warm reboot not helping.
Ubuntu 18.04 + laptop MSI GS65 8RE (GTX 1060).
kernel 4.15-74,
tried all drivers from ubuntu repo - 390, 410, 415,430,435, 440 - nothing working with it.
tried latest driver from nvidia site - not working also.
Update:
reinstalled latest Ubuntu 18.04.3 from scratch with all latest updates (kernel 5.3)
nouveau - external display workin, but black, only mouse movements displayed
nvidia - 435
external display in power save state, but Ubuntu see it like working display and expanding on it ?
nvidia - 440
Ubuntu not see external display at all - never
Update: found problem - it was intel sound driver ?
Somehow it influencing on nvidia ?
If I adding it to blacklist, external display working correct with suspend.
But, in this case audio not working, builtin and HDMI display.
create file : /etc/modprobe.d/blacklist-intel_snd_suspend.conf
with content:
#for kernel 4.x
blacklist snd_hda_intel
#for kernel 5.x - additional modules, if not disable it - suspend not working
blacklist snd_sof_intel_hda
blacklist snd_sof_intel_hda_common
blacklist sof_pci_dev
blacklist snd_sof_intel_byt
blacklist snd_sof_intel_ipc