I’m having a downright bizarre issue with my monitors under Manjaro that’s started after recent updates.
From a cold boot or a reboot, everything is perfectly fine and seems normal. However, after the computer goes to sleep and the screens are turned off, 2/3 of my monitors will not turn back on. The two that stay off are connected directly via Displayport, the one that turns back on just fine is connected via a Displayport->VGA adapter. Usually, either switching to a tty and back several times or toggling the display to disabled and back to enabled in settings will get it back on, but obviously I don’t want to need to do this.
The issue occurs on both the 5.7.17-2 Linux kernel and the 5.3.3-2 Linux kernel. It does not occur on Windows when dual booting. My kernel parameters in grub are “quiet apparmor=1 security=apparmor resume=UUID=d5c04289-a888-4279-abbd-f630feb55357 udev.log_priority=3 amdgpu.ppfeaturemask=0xffffffff immu=pt acpi_enforce_resources=lax”, though none of those were changed before this problem developed. Nothing was changed besides the update pushed by Manjaro stable.