Summary On the HP ZBook Ultra G1a (AMD Ryzen AI Max, “Strix Halo”), the system fails to resume from suspend (s2idle). The machine hangs on resume and requires a hard power cycle. I have traced this to the AMD ISP4 camera driver stack — specifically a known resume-probe race condition in i2c-designware-amdisp.c that is fixed upstream but does not appear to be backported into the current CachyOS kernel. A systemd sleep hook that unloads and reloads the four ISP modules around suspend/resume fully...