Describe the bug
I have all the latest packages from the ArchLinux repos, among which is the NVIDIA 470 driver.
The motion compensation as far as I know relies on the async reprojection support which was made available in the 470 driver release a while ago. But I can't enable it in my SteamVR.

To Reproduce
Steps to reproduce the behavior:

1. Go to SteammVR
2. Click on 'Video' and then hover over 'Motion smoothing".
3. See it is disabled and a hint "Motion smoothing is not supported on this GPU / Driver version."

Expected behavior
It should work, not be disabled and being able to be turned on and work.

System Information (please complete the following information):

• Distribution: Arch
• SteamVR version: 1.19.6 or 1.18.7
• Steam client version: Aug 4 2021 at 17:06:57
• Opted into Steam client beta?: Yes
• Graphics driver version: [run nvidia-settings or vulkaninfo | grep driverInfo: 470.57.02
• Gist for SteamVR System Information: https://gist.github.com/vityafx/b2e22d2137f7b9f6429cb0f72a3b3581

Screenshots
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Additional context
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Note: Commenters who are also experiencing this issue are encouraged to include the "System Information" section in their replies.