Requiring reboot when suspending computer with several open pdf readers (okular or evince, tried with both)

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1

Ubuntu 24.04.2 LTS, Linux 6.11.0-17-generic
GNOME 46
Wayland

Quite often, my computer is requiring forced reboot (try to wake it up but stays in a dark screen and have to turn it off with the power button) after the computer enters suspension state with several open pdf readers (okular or evince, tried with both; pdfs are of scanned books). I have a 8Gib memory, swap is activated. ClamAV daemon running in background.

I tried locking the computer manually, without success, but nothing else (other than closing the readers).

2

Welcome to Ubuntu Discourse :slight_smile:

8GB of RAM is not a lot if you have multiple PDFs open.

Do you have a swap partition or swap file?

In a terminal, check this and show the output:
swapon --show

After a forced reboot, check the logs:
journalctl -xe | grep suspend

Look for any errors related to suspend or wake-up.

Is there a reason you are running ClamAV?

Try temporarily stopping and disabling to see if that resolves the issues:

sudo systemctl stop clamav-daemon
sudo systemctl disable clamav-daemon

Try switching to X11 at the login screen instead of Wayland to see if that makes a difference: from the gear icon at login choose Ubuntu on Xorg

Note that this will be the default unless you change back to Wayland.

Hopefully, some of this will help.

3

If ClamAV is scanning, that could be your problem right there. Try stopping the daemon and see if the issue persists.

More generally: run a system monitor while you’re doing things and pay attention to what’s using your CPU and memory.