I’m not sure I’m following…
How would this help with the HDMI bandwidth limit? If you get a dummy device you might be able to set the a higher resolution and refresh rate, but the output will still go to that dummy device (i.e. nowhere), and doesn’t help you with displaying over HDMI.
So I hope I got this right…
“Linux VM” is hopefully typo and you mean the Linux Host, because otherwise none of this makes sense to me.
So the Host has 60 Hz, so far so good.
So your Windows VM would have a physical Display attached with 30 Hz, but you would use 60 Hz via Looking Glass?
AFAIK to do this you’d have 2 options:
- Output actual 60 Hz, i.e. overriding what the EDID reports and hope the display just drops every second frame. Which it probably won’t because the HDMI bandwidth limit means that there’s not even 60 FPS going out.
- Use the Display and a dummy plug at the same time. But then you’d have mixed refresh rates and I don’t think Windows allows that when mirroring a display.
But what I don’t get: Assuming you get your hands on a working dummy plug, why don’t you just drop the physical Display connection? That way you have only one “Display”, and can use Looking Glass to display the 60 FPS/60 Hz on the Host (i.e. Looking Glass Client).
But at that point you might run into bandwidth limitations in Looking Glass. IIRC there were some issues with [email protected] already. @gnif would know more about that, since I haven’t kept up with Looking Glass.