Hi all As per the subject, Arch goes nicely to sleep, but waking up goes wrong. I see the entries in the dmesg logs: [32990.466213] nvidia-modeset: ERROR: GPU:0: Failed detecting connected display devices [32990.466250] nvidia-modeset: ERROR: GPU:0: Failed detecting connected display devices [32990.466256] nvidia-modeset: ERROR: GPU:0: Failure reading maximum pixel clock value for display device DVI-I-1. [32990.466785] nvidia-modeset: ERROR: GPU:0: Failed detecting connected display devices [32990.466791] nvidia-modeset: ERROR: GPU:0: Failure reading maximum pixel clock value for display device HDMI-0. [32990.467214] nvidia-modeset: ERROR: GPU:0: Failed detecting connected display devices [32990.467219] nvidia-modeset: ERROR: GPU:0: Failure reading maximum pixel clock value for display device HDMI-1. [32990.467678] nvidia-modeset: ERROR: GPU:0: Failed detecting connected display devices Which are mentioned in the Arch Linux NVIDIA troubleshooting: https://wiki.archlinux.org/index.php/NVIDIA/Troubleshooting#System_does_not_... I have applied the fix: sudo strings /sys/firmware/acpi/tables/DSDT | grep -i 'windows ' | sort | tail -1 Windows 2015 cat /boot/loader/entries/arch.conf title Arch Linux linux /vmlinuz-linux initrd /intel-ucode.img initrd /initramfs-linux.img options root=UUID=0d9c3207-a30f-4273-95fa-80e0cf5624ba rw nvidia-drm.modeset=1 resume=PARTUUID=82a0cf4c-5d39-7647-94e3-be1a46741847 acpi_osi=! \"acpi_osi=Windows 2015\" Which is how I boot: cat /proc/cmdline initrd=\intel-ucode.img initrd=\initramfs-linux.img root=UUID=0d9c3207-a30f-4273-95fa-80e0cf5624ba rw nvidia-drm.modeset=1 resume=PARTUUID=82a0cf4c-5d39-7647-94e3-be1a46741847 acpi_osi=! \"acpi_osi=Windows 2015\" I've tried any combination of with and without quotes But resuming from spend still doesn't work. I don't recall exactly when this started happening but things used to work for years... This system has got a built-in Intel GPU and I can switch between setting the intel as IGD in the cmos. but using this setting has no bearing...