FWIW, I've been running extensive testing of the trunk with libpciaccess on many distros today.
The only annoying thing I found is that Fedora 9-12 and RHEL/CentOS 5 include a buggy patch in their libpciaccess package. It makes the libpciaccess initialization fail with EPERM when not root (and hwloc then gets no PCI devices). I guess they didn't care because X.org ran as root. We'll have to keep that in mind if we ever get such a bug report. Aside from this one, I couldn't find any other problem, so I'll do a v1.6.2rc1 tomorrow morning. Brice
