18.04 Screen remains blank after wake up from suspend

Solution 1:

It is the buggy nouveau driver again. That's what solved the issue for me. Edit the file /etc/default/grub (using Vi editor -- some users have not been able to save after editing in Vi and have had to use the alternate "Ex" editing mode, which substitutes sudo edit below, then Alt+:w and :x for the save and exit commands).

$ sudoedit /etc/default/grub 

Add nouveau.modeset=0 to the line that says GRUB_CMDLINE_LINUX then press CtrlO to save the file and CtrlX to leave Editor.

Run

$ sudo update-grub

Now reboot.

Solution 2:

That seems graphics card driver problem.
Try Ctrl + Alt + F3 then Ctrl + Alt + F2 (might be F7) this might turn on display.
But it's temporary solution.

You may want to persistent solution then you can try to upgrade or change your graphics driver or try @cascagrossa's grub settings solution.

Solution 3:

for me switching from gdm3 to lightdm display manager did the trick

Solution 4:

Here is what fixed this issue for me on Kubuntu 20.04 Intel NUC PC (NUC8i7HVK), which has Intel HD graphics + embedded Radeon RX Vega M GH:

I went into UEFI BIOS settings and enabled PCIe ASPM (Active State Power Management). I left some other settings such as "Native ACPI OS PCIe" disabled

This is very easy to test so give it a shot and see if it helps.