Hey! I had a similar issue on a fresh setup with NVidia drivers from backports. After resume fonts disappeared and graphic/rendering was 'unstable'. I added 'NVreg_RegisterForACPIEvents=1' to the NVidia kernel modules' options and all the issues were gone. Maybe this helps?
In /etc/modprobe.d/nvidia-kernel-common.conf: - options nvidia NVreg_DeviceFileUID=0 NVreg_DeviceFileGID=44 NVreg_DeviceFileMode=0660 + options nvidia NVreg_DeviceFileUID=0 NVreg_DeviceFileGID=44 NVreg_DeviceFileMode=0660 NVreg_RegisterForACPIEvents=1 NVreg_EnableMSI=1 -- Adi
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