Even worse, now that I tested it more thoroughly. After the 2nd standby/resume cycle, the display stayed blank, even though X/KDE seem to have been back, judged by the LED activity. Alt-Ctrl-Backspace got it back, but in the wrong resolution. After that, all further standby/resume cycles worked fine.
[Update: maybe this was related to the fact that I still had the CPU-shutdown-workaround installed. After I removed it, it seems to standby/resume much more stable. Still wifi turned off after certain cycles, and monitor detection popup.]
Suspend/resume cycles seem to be completely stable now, beside the flickering.
I've seen then touchpad issues too with my first testing after the kernel update, but not anymore.
Even worse, now that I tested it more thoroughly. After the 2nd standby/resume cycle, the display stayed blank, even though X/KDE seem to have been back, judged by the LED activity. Alt-Ctrl-Backspace got it back, but in the wrong resolution. After that, all further standby/resume cycles worked fine. workaround installed. After I removed it, it seems to standby/resume much more stable. Still wifi turned off after certain cycles, and monitor detection popup.]
[Update: maybe this was related to the fact that I still had the CPU-shutdown-
Suspend/resume cycles seem to be completely stable now, beside the flickering.
I've seen then touchpad issues too with my first testing after the kernel update, but not anymore.