I'm not using the Nvidia drivers and am experiencing the same issue.
➜ ~ sudo lshw -c video
[sudo] password for meowsus:
*-display
description: VGA compatible controller
product: Crystal Well Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 08
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:50 memory:a0000000-a03fffff memory:90000000-9fffffff
ioport:1000(size=64) memory:c0000-dffff
For what it's worth here are my inhibitors:
➜ ~ systemd-inhibit --list
Who: gdm (UID 121/gdm, PID 1524/gsd-power)
What: sleep
Why: GNOME needs to lock the screen
Mode: delay
Who: ModemManager (UID 0/root, PID 1039/ModemManager)
What: sleep
Why: ModemManager needs to reset devices
Mode: delay
Who: gdm (UID 121/gdm, PID 1520/gsd-media-keys)
What: sleep
Why: GNOME handling keypresses
Mode: delay
Who: GNOME Shell (UID 1000/meowsus, PID 2563/gnome-shell)
What: sleep
Why: GNOME needs to lock the screen
Mode: delay
Who: NetworkManager (UID 0/root, PID 1082/NetworkManager)
What: sleep
Why: NetworkManager needs to turn off networks
Mode: delay
Who: meowsus (UID 1000/meowsus, PID 2729/gsd-media-keys)
What: sleep
Why: GNOME handling keypresses
Mode: delay
Who: gdm (UID 121/gdm, PID 1520/gsd-media-keys)
What: handle-power-key:handle-suspend-key:handle-hibernate-key
Why: GNOME handling keypresses
Mode: block
Who: UPower (UID 0/root, PID 1349/upowerd)
What: sleep
Why: Pause device polling
Mode: delay
Who: meowsus (UID 1000/meowsus, PID 2678/gsd-power)
What: sleep
Why: GNOME needs to lock the screen
Mode: delay
Who: meowsus (UID 1000/meowsus, PID 2729/gsd-media-keys)
What: handle-power-key:handle-suspend-key:handle-hibernate-key
Why: GNOME handling keypresses
Mode: block
10 inhibitors listed.
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https://bugs.launchpad.net/bugs/1767715
Title:
Laptop does not suspend after lid is closed on nvidia drivers
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