I don’t need the patch (Quadro P4000 has unlocked encodes) but I will look into updating the driver, as I notice 450.66 is available.
As far as I can tell, I don’t have the nouveau drivers installed:
$ sudo lshw -C display
*-display
description: VGA compatible controller
product: GP104GL [Quadro P4000]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:21:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nvidia latency=0
resources: irq:129 memory:c0000000-c0ffffff memory:d0000000-dfffffff memory:e0000000-e1ffffff ioport:1000(size=128) memory:c1000000-c107ffff
I’ll report back if I still have the issue after updating the drivers. Other ideas and root cause thoughts welcome! Thanks!