Ubuntu screen blank (black) after resolution change on auto-login VM

[stewlg]

I have a few Ubuntu VMs I use in interactive mode on the console. I've been running older, obsolete versions of Ubuntu because whenever I try to upgrade / rebuild with a new VM, I get stuck with the same issue.

To reproduce (for me at least):

- Install Ubuntu on Promox VM (ubuntu-22.04.2-desktop-amd64.iso)
- Choose auto-login during installation
- install all patches offered

At this point, the VM will be able to reboot, and auto-login will work. You can restart repeatedly and the VM will auto-login and remain properly interactive, as it should.

But, go to Settings and switch to 1920 x 1080 screen resolution and the problems will start, for me.

* Sometimes you will be unable to switch to 1920 x 1080. The screen will change size, but stop updating, so you can't assent to the resolution change and then it reverts. If it fails to change, you may get a Ubuntu 22.04 error, a SIGSEGV in gnome-shell.
* If it does work, it will seem to be fine, but once you reboot you'll get a black screen that you can't interact with until the console locks after several minutes. This makes the VM nearly useless for my purposes.

I'm running the following Proxmox version:

Linux 5.15.107-2-pve #1 SMP PVE 5.15.107-2 (2023-05-10T09:10Z)

pve-manager/7.4-3/9002ab8a

 

[konkar]

Change the graphics card to SPICE can solve the problem.

 

[j.io]

Same here, any update?

 

[trakatelis]

For OVMF (UEFI) BIOS:

1. Edit VM's display settings and set video memory to 24 MiBs.

Graphic card: Default
Memory (MiB): 24

2. During boot hit Esc to enter UEFI BIOS and set Device Manager / OVMF Platform Configuration /
Change Preferred 1920x1080 / F10=Save / Y / Esc / Esc / Reset.

3. Select the same resolution in Ubuntu 22.04 Desktop.

 

[j.io]

For OVMF (UEFI) BIOS:

1. Edit VM's display settings and set video memory to 24 MiBs.

Graphic card: Default
Memory (MiB): 24

2. During boot hit Esc to enter UEFI BIOS and set Device Manager / OVMF Platform Configuration /
Change Preferred 1920x1080 / F10=Save / Y / Esc / Esc / Reset.

2. Select the same resolution in Ubuntu 22.04 Desktop.

Thanks, but I have SeaBios, not UEFI for that VM. Is there something similar for SeaBIOS?

 

[trakatelis]

For Default (SeaBIOS) BIOS:

1. Edit VM's display settings and set video memory to 24 MiBs.

Graphic card: Default
Memory (MiB): 24

2. Select your preferred resolution in Ubuntu 22.04 Desktop.