Ubuntu 18.04 won't wake after screen lock and blank / suspend / sleep

I am trying to run Ubuntu 18.04 on a laptop with an AMD A12 processor and Radeon R7 graphics. I am having nothing but problems and am very discouraged with Ubuntu though I used 12.04 for years without such problems. I have two problems that are maddening, and I will post them separately. The problems happen only on Gnome and Ubuntu on Xorg and do not happen on Wayland. However, I am told that it's best not to run Gnome on Wayland. This problem is that the computer sometimes doesn't wake up from suspend. Well, I think it does wake up because the optical drive spins and the hard drive ticks away, but I cannot login because the lock screen is a hash of colors or a distorted background without a place to login. I cannot even Ctrl-Alt-F1 to get to a prompt. All input is frozen. I am wondering if Xorg is configured correctly. I am running the Oilaf video driver which works well under Wayland so I don't know if there is a problem with Xorg and that driver.