XServer providers no longer available to normal users in S11

Question

I haven't yet found a means of accessing Solaris 11's XServer probes as a normal user. My user has all dtrace privileges (dtrace_user,dtrace_proc,dtrace_kernel), but dtrace -l -n 'Xserver*' gives:
pfexec dtrace -l -n 'Xserver*'
ID PROVIDER MODULE FUNCTION NAME
dtrace: failed to match :::Xserver*: No probe matches description
The same command as root shows all Xserver probes.
Edited by: bnitz on Dec 1, 2011 6:10 AM
Removed comment about sudo as an inferior alternative to pfexec. In this case they are both equivalent, this particular dtrace use-case seems to require uid=0.

Answer 1

There seems to be at least two options:
Add your user to the the /etc/sudoer file and sudo dtrace -l -n 'Xserver*'
or
Add back the "Primary Administrator" role (or an equivalent role with uid=0) and grant this role to the user.
In many cases RBAC provides much more granular control of accesses and permissions than sudo, but in this example I'm using RBAC to run as UID 0 so if I do this by user instead of by file, I don't gain much advantage of using RBAC.
The fact that dtrace_kernel, dtrace_user and dtrace_proc are not sufficient for tracing Xorg does seem a bit strange. This may be because Xorg runs as root.