I have couple laptops, some of them having problems waking up.
Let start from old Asus K55N, recently I have updated it from MGA5 to be able run draftsight 2019. There was no problem with suspend and hibernation running MGA5.
Now none of them works, screen is black after resuming, computer reacts to Caps Lock and Num Lock (leds), but screen stays black in both cases of suspend and hibernation, on MGA5 I was using proprietary driver now is Xorg, that may be a problem, but I have HP pro book with MGA6 and Xorg driver that works correctly.
The other two laptops with some how similar setup are Asus GL520 and Lenovo Legion Y530, both on mageia-prime Nvidia driver, and here everything is fine on Asus with MGA6, but same black screen on Lenovo using hibernation, suspend works fine, although hybrid that supposedly should work as suspend unless there are no more power is same as hibernation.
The only laptop that is hibernating correctly with MGA7 is HP Envy with hardware similar to Asus GL520 but somehow it can not boot to X with mageia-prime (can switch to it with -z option, but will nor booth later) so it is working on Intel graphics.
In addition - It is not Mageia itself- new Plasma even compering to MGA6 is not really nice, on older lower resolution Asus K55N, all dialogs (like system settings) are way to big, changing icon sizes just adding space around them not bringing them closer so application window takes almost whole screen.