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Starting Tuesday 3/23/21, hitting the power button causes the usual disk sounds that indicate wake-up but screen stays black. Pressing F1 - F12, ESC, return, etc. have no effect. I have been using systemctl suspend for years without this problem. So far a forced reboot is my only workaround. Machine: desktop with Intel DZ77GA-70K motherboard. BIOS : Intel version: GAZ7711H.86A.0021.2012.0222.2054, 02/22/12 CPU: Intel Core(TM) i7-3770S CPU @ 3.10GHz video: AMD Cedar [Radeon HD 5000/6000/7350/8350 Series] Ubuntu 16.04.7, linux-image-4.15.0-140-generic:amd64 I can show a couple entries in /var/log/apt for 3/23 and 3/24, if they're pertinent. There is a suggestion relating to laptops to change /etc/default/grub line 11 from GRUB_CMDLINE_LINUX="" to GRUB_CMDLINE_LINUX="nouveau.modeset=0" but I don't know enough to do this without advice.

Dave Shuman
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this happened to me too recently, and after some searching it might have been a video driver missing (use software-properties-gtk --open-tab=4 to select the driver). What I did to fix this is that I installed xscreensaver, which seemed to clear up the issue. (The noveau modeset thing has something to do with the closed-source video drivers not being used in Ubuntu, as they cant distribute them legally in their OS)

0sleep
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  • Installing xscreensaver apparently didn't add any code, because the problem remains. Actually running xscreenserver doesn't help either. I hope somone can offer an effective solution,,, – Dave Shuman Mar 31 '21 at 18:17