I searched around and didn’t see anything about this, so apologies if this has already been addressed.
I’m running an Ubuntu 20.04 host and Windows 10 guest through virt-manager, and have looking glass B3 running pretty nicely. I’m running into an issue though where after I start up the vm, I get low performance for my passthrough card (radeon hd 6770). To pick a random benchmark for reference, it gets 44fps in Cinebench R11.5.
If I close looking glass and switch inputs on my monitor instead, Cinebench’s score jumps to 70fps. I figured this was just the hit on this old gpu. The weird thing is when I switch back to my host os and open looking glass again, the score stays at 70fps when I run the test.
The score only jumps when I close looking glass, switch inputs, then open looking glass again. If I leave looking glass open when switching inputs, it doesn’t work.
This happened consistently when I tried this a few more times. I also switched to the latest bleeding edge version from 2021-04-25, no change.
Is there something I’m doing wrong, or some way to troubleshoot this?