iPad: GL-capable video adapter won't autodetect resolution

[jsonmona]

Describe the issue Screen resolution is not autodetected and defaults to '1280x800' ever since (including) 4.3.2. This only happens with GL-capable video adapters (virtio-ramfb-gl and virtio-gpu-gl-pci).

Running xrandr --output Virtual-1 --auto won't fix it.

I have tested following versions:

• 4.2.5 (OK)
• 4.3.0 (OK)
• 4.3.1 (OK)
• 4.3.2 (Bad)
• 4.3.4 (Bad)
• 4.3.5 (Bad)
• 4.4.1 (Bad)

Also, Windows VM with "virtio-ramfb" video adapter won't update display. I'm not sure if it's related to this issue. Will create another one after more investigation.

Configuration (required)

• UTM Version: from 4.3.2 to 4.4.1
• OS Version: 15.4.1
• Device Model: M1 iPad (12.9 inch, 5th gen)
• Is it jailbroken (name jailbreak used)? No
• How did you install UTM? TrollStore

Debug log Will collect one if you need it.

Upload VM Followed instructions on documentation to install ubuntu. JIT enabled, retina mode doesn't matter. Using video adapter "virtio-gpu-gl-pci".

Edit (2023/10/10): Confirmed that this bug triggers only with GL-capable video adapters.

[Sijiahui]

In my ipadpro2021, I test the UTM Version(4.2.5-4.4.2).Only UTM(4.2.5) can use the correct resolution(2388x1668) in both windows 11 and ubantu22.04,also I don't need to change any setting,it can choose the most suitable resolution automatically.

UTM Version: from 4.2.5 to 4.4.2 OS Version: 15.3.1 Device Model: M1 iPad (11 inch, 2021) Is it jailbroken (name jailbreak used)? No How did you install UTM? TrollStore

[jsonmona]

So it does work with 4.4.2? Hmm. I guess I would try again with a fresh guest OS install. I'll reply soon.

[jsonmona]

I did reinstall and it still doesn't work. I can change resolution, but the correct resolution (whatever x 2048) is not in the list.

@Sijiahui Just to be clear, do you use opengl acceleration?

[jsonmona]

I tested with latest beta (4.4.2), and confirmed that only GL-capable video adapters are broken. I did not test Windows.

virtio-ramfb and virtio-gpu-pci -> works as expected (correct resolution)
virtio-ramfb-gl and virtio-gpu-gl-pci -> broken (does not autodetect resolution, defaults to 1280x800)

Retina mode doesn't seem to effect this issue.

[Sijiahui]

I did reinstall and it still doesn't work. I can change resolution, but the correct resolution (whatever x 2048) is not in the list.

@Sijiahui Just to be clear, do you use opengl acceleration?

Yes,I use the opengl acceleration.Maybe I misrepresented.4.4.2 cannot work,only 4.2.5 can work correctly.

I choose the "virtio-gpu-gl-pci(GPU Supported)" in the win11,tiny11,ubantu22.ubantu20.They can all work correctly.

In the resolution ,there is a choice of "2388x1668“

[jsonmona]

Ah, I see. So you are just confirming this issue.

[klumberge]

@jsonmona Did you ever get to solve this? I am facing this issue with Ubuntu as well.