Proxmox 7.4-3, Ubuntu 20.04 SeaBIOS/i440fx (same with OMVF/q35) guest. iGPU (Intel 620 with i5-7200u) passed through.
I do see the output on my 4k Samsung TV over HDMI, but the resolution is limited at 1280x800 (or less), and none of the resolutions is 16x9 - either 4x3 or 16x10. I don't plan to game on it, but I would like to use it for emulation, and need proper aspect ratio. 3D acceleration seems to be working, but the output looks kinda weird, with lots of tearing. the iGPU is detected as "Mesa Intel HD Graphics 620 (KBL GT2)". UEFI or BIOS on host or guest make no difference.
One more data point - the boot screen (spinner and Ubuntu logo) are fine - proper aspect ratio and seemingly full 4k resolution. Trouble starts at desktop.
The hardware is capable of running 4k/60Hz in Windows VM, so it's not a HW or HDMI issue. Any clues? Thanks!
EDIT: tried xrandr --newmode but to no avail. The new resolution IS added to the display settings but immediately revert back to 1280x800.
I do see the output on my 4k Samsung TV over HDMI, but the resolution is limited at 1280x800 (or less), and none of the resolutions is 16x9 - either 4x3 or 16x10. I don't plan to game on it, but I would like to use it for emulation, and need proper aspect ratio. 3D acceleration seems to be working, but the output looks kinda weird, with lots of tearing. the iGPU is detected as "Mesa Intel HD Graphics 620 (KBL GT2)". UEFI or BIOS on host or guest make no difference.
One more data point - the boot screen (spinner and Ubuntu logo) are fine - proper aspect ratio and seemingly full 4k resolution. Trouble starts at desktop.
The hardware is capable of running 4k/60Hz in Windows VM, so it's not a HW or HDMI issue. Any clues? Thanks!
EDIT: tried xrandr --newmode but to no avail. The new resolution IS added to the display settings but immediately revert back to 1280x800.
Last edited: