Parent Device Lost on Suspend

[eblack-leaf]

I am getting a panic from validation layer stating "Parent device is lost" when I suspend ubuntu 22 with x11. There is no event emitted from winit to stop rendering so the next time i use Surface::get_current_texture it panics. Is there a way to detect this before it is fatal? I know v24 made changes to that but it still panics for me. On ubuntu 24 wayland it does not panic on suspend. I tried Device::lost_device_callback() but it seems too late for that to stop anything.

[cwfitzgerald]

Do you get a Suspend event from winit at all (or conversely, get resume event)?

If you're registering a device loss callback, this should, in theory route everything, but surfaces were probably not specially routed. You can also try wrapping it in an error scope, but I'm a bit doubtful that'd work either.

[eblack-leaf]

Resume event is assured to happen on all platforms, in which you can do initialization (adapter, device) but only web / ios / android have Suspend. The device lost callback triggers in which I used an Arc<Mutex<bool>> to set a flag to stop rendering but it it is triggered by the call to Surface::get_current_texture() so I cannot intercept it. I assumed it would return an error and I check if I do have a surface_texture to use as a result of the get_current_texture() and not render in that case.