I can confirm the results of xrandr and dmesg|grep drm above with the same kernel and nvidia driver versions on my system (a Thinkpad P50 with an M2000M).
An additional symptom I have is that the nvidia-settings application no longer supports PRIME at all; the PRIME Settings category in the application just doesn't appear. Here's the output when I start the application.
$ nvidia-settings
** Message: 15:46:31.025: PRIME: No offloading required. Abort
** Message: 15:46:31.026: PRIME: is it supported? no
I can confirm the results of xrandr and dmesg|grep drm above with the same kernel and nvidia driver versions on my system (a Thinkpad P50 with an M2000M).
An additional symptom I have is that the nvidia-settings application no longer supports PRIME at all; the PRIME Settings category in the application just doesn't appear. Here's the output when I start the application.
$ nvidia-settings
** Message: 15:46:31.025: PRIME: No offloading required. Abort
** Message: 15:46:31.026: PRIME: is it supported? no