Intel (Power Saving Mode) cannot be selected / greyed out / unavailable in PRIME Profile selection in NVIDIA X Server Settings on a system with an integrated Intel GPU and discrete NVIDIA GPU.
A reply in 220665/2 says (sorry, link count restricted to 4 for new users)
The switch is ia patched version of nvidia-settings by ubuntu, rather report it to their bug tracker.
However Ubuntu Manpage: nvidia-settings - configure the NVIDIA graphics driver states
If there are other things you would like to see added (or better yet, would like to add yourself), please contact linux-bugs@nvidia.com
and an NVIDIA copyright notice is shown.
Is this the correct place to report this bug? The bug still exists after more than 2 years, see
1
2
3 1400505/cant-switch-gpu-to-intel-in-prime-profiles
and many Reddit posts.
Note: enabling/disabling intel power saving mode should take effect without restarting session.