@koba, if I understood you correctly, yes, ACPI errors still appear on drm-tip. Actually, all hell broke loose on that kernel: after triggering the issue, Bluetooth became unresponsive; calling sudo to edit /etc/default/grub ended up hanging indefinitely; other applications being launched were showing weird rendering glitches and became unresponsive. Logs attached.
@koba, if I understood you correctly, yes, ACPI errors still appear on drm-tip. Actually, all hell broke loose on that kernel: after triggering the issue, Bluetooth became unresponsive; calling sudo to edit /etc/default/grub ended up hanging indefinitely; other applications being launched were showing weird rendering glitches and became unresponsive. Logs attached.