Split from this thread.
I am experiencing the same issue with my new i7 SP4 and CS5.1 Photoshop.
Wintab drivers provided by MS have no effect and I am unable to use pressure sensitivity within Photoshop. Pressure sensitivity in Win10 applications is unaffected. I have used PS on coworkers' surfaces so I am certain that it can be done, but the fixes here have not worked for me as of yet.
Have you learned any more about the issue in the last months?