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I have Plasma 5 (with SDDM) and Xfce installed on my laptop. When I suspend the system it resumes to a black screen with a frozen mouse pointer on it, the only thing I can do is hold the power button and force shut down. I've found other posts about this but there about plasma 4 and the solutions say to use setting's that don't exist in plasma 5. Also, they say they can use ctrl+alt+F# to switch to another tty but on in my case none of the keyboard shortcuts work, it's completely locked up. If I try it on Xfce it does the same thing except that see what I had on-screen, so I don't know if plasma is causing it, or if it's unrelated.
Thanks in advance everyone
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I've had the exact same problem, and I've tried to fix it for days. I removed plasma and xorg and reinstalled xorg (and twm et al.) and I had the exact same problem with the default xorg session, so I assume it's something to do with that. If anyone has a cure for it, I'd love to know.
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I found the following recommendation on the "Suspend and Hibernate" page on the wiki:
There have been many reports about the screen going black without easily viewable errors or the ability to do anything when going into and coming back from suspend and/or hibernate. These problems have been seen on both laptops and desktops. This is not an official solution, but switching to an older kernel, especially the LTS-kernel, will probably fix this.
I installed the LTS-kernel, uninstalled the normal kernel, and rebooted but it didn't help at all so I switched to the normal kernel again.
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