Dual monitor suspend, one monitor does not turn on when waking up. (lemmy.ml)

submitted 2 months ago by [email protected] to c/[email protected]

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Finally got my wife away from Windows and on Fedora 40 (Gnome 46).

Now, when her PC goes to suspend and when she wakes it up, one of her 2 monitors doesn't wake up.

Both are connected to HDMI ports (no dedicated video card, just the integrated card in her Ryzen 9).

Any ideas on what could be happening? I wouldn't want her to go back to Winblows over something so insignificant, but she would.

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[-] [email protected] 2 points 2 months ago

So it works on windows? If so, then it's probably not a hardware issue.

What I could recommend to help track down the issue:

test another distro, if possible - sitting here on NixOS it works for me
test another display manager (aka X11)
test another desktop (KDE, LXDE, whatever)

If it's none of the above, you might need to get your hands dirty

check if it's always the same monitor
check the logs (journalctl --boot -xe) maybe something will jump out
monitor the reconnection of peripherials with sudo udevadm monitor

start it when everything's booted up and everything's plugged in
disconnect problem monitor then reconnect it and observe the output
suspend then wake the computer and check the output

That might give you a hint of what's going on.

There's a change something isn't working in terms of drivers. You can probe her computer with the executable from https://linux-hardware.org/ and share uploaded result here. Maybe there'll be an indication of a missing driver or something.

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this post was submitted on 29 Apr 2024

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