Debian Suspend ?

[TrigZe]

I'm sorry for the title subject, I didn't know what I was getting into.

I've a VM for exam. it's run in debian 64 bit.
i start the vm and i leave it for 1 hour while my student work the exam.
but after 1 hour, the vm get blank screen and the exam got trouble cause anyone can't access it.

like this for after i start the VM

After Start VM

Screenshot 2024-12-04 203533.png (24.43 KiB) Viewed 1410 times

like this after 1 hour

After 1 hour

Screenshot 2024-12-04 203925.png (24.64 KiB) Viewed 1410 times

i run it in windows 11 host. my friend say i should run in windows 10 host cause in windows 11 has problem about VM idle / stay awake for long time.
then, i install windows 10, but i install it with dual boot start up. but the problem it's still same while in windows 11.

i don't know what happen, i just think cause suspend but in VB the status is running.
the specification of VM is the maximum of green bar.

It should win single boot with windows 10 ?

my pc =
Core i5 12400f
core 12
ram 16

the VM
core 3
ram 4
video memory 128b

[klaus]

Are you sure it's really suspend not working right or is this the console screen blanking on Linux (which IIRC happens after 10 minutes). This could be of course an indirect consequence of suspend: time in the VM will leap forward by the time in suspend mode.

[TrigZe]

I don't really know what's the problem. I've search on this forum in 5 days and still can't find the solution it.

Because, I see in another PC (my friend), after long time in use, the screen didn't get blank. The text (first image) is appears.

It's just my assume that get suspend. If I'm press the ACPI shutdown, the text it's shown again from the blank screen and process it to shutdown.

The second assume that it's likely windows when leave for times, it will blank screen. But if I'm search in this forum, -where I don't know how to find with the right keywords-, I didn't find it. I think this is the same as your answer.
I've turn off the sleep mode on host OS, but for the VM still get blank after a minutes or hours (the longest can be access 70-75 minutes with blank screen and after that can't be accessible for exam)

[klaus]

The point is that most likely this behavior is unrelated to VirtualBox. Therefore it's not really a topic for the VirtualBox forums.

Have you tried pressing a key (yes, Shift or some such should be enough) when the VM window has focus?