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75HZ is maximum in VM #7820
Description
Describe the issue
Example in guests Gnome/KDE, 75hz is maximum, even though my M3 Pro has a 120hz screen and can connect to external monitors. This makes experience less smooth
Configuration
- UTM Version: latest, bought in app store
- macOS Version: 26.5.2
- Mac Chip (M3 Pro):
Crash log
no crash.
Debug log
not needed.
Upload VM
every linux vm created
Activity
Skrimi-max commentedon Aug 26, 2026
Is 75hz really a big deal? It is a VM, and a VM is for testing purposes and not being daily driven
Fail-Safe commentedon Aug 30, 2026
@Skrimi-max Troll?
To the people who have use-cases for 120FPS, yes. Just because you might not need it doesn't mean no one does.
Is it? According to whom? What would you say to the likes of someone like AWS who is running thousands-upon-thousands of VMs (EC2 Instances) in production for critical services across the world?
dragoshont commentedon Oct 18, 2026
For QEMU VMs in UTM.app this is still 75 Hz after 5.0.8. The EDID change in #7963 uses the refresh rate the display frontend reports, but UTM drives QEMU through SPICE, which has no field for it. Guests therefore still get the synthesised 75 Hz mode: Linux guests read 75.00 Hz from the EDID, and Windows 11 lists only 75 Hz modes.
On top of that, on a 120 Hz ProMotion display the VM window itself was capped at 60 fps by MTKView's timer.
Two draft PRs address both halves:
CAMetalDisplayLink. The VM window went from 60 to ~120 fps on a ProMotion display.osy commentedon Oct 18, 2026
Oh darn the change on cocoaspice never got pushed, oops.
qemu: tell the guest the refresh rate of the display it is shown on
qemu: let UTM set the virtio-gpu refresh rate
qemu: let UTM set the virtio-gpu refresh rate
qemu: tell the guest the refresh rate of the display it is shown on
qemu: tell the guest the refresh rate of the display it is shown on
qemu: let UTM set the virtio-gpu refresh rate
qemu: tell the guest the refresh rate of the display it is shown on