Comment 10 for bug 956051

Same on AMD Opteron(tm) Processor 4226 with ubuntu 12.04

libc6: 2.15-0ubuntu10
linux-image-generic: 3.2.0.24.26
xen-hypervisor-4.1-amd64: 4.1.2-2ubuntu2

cpuid_mask_ext_ecx=0xFFFEFFF cpuid_mask_ecx=0xEFFFFFF didnt work.

cpuid_mask_cpu=fam_10_rev_c works for me