Comment 6 for bug 357900

Well, if you hadn't said anything about cmov I would have thought this was definitely an xorg bug. It's slightly possible it could be a processor issue, but I think it's very unlikely that your computer would get as far as the desktop at all in that case. Anyway, if it really is a cmov issue, then unfortunately this bug is invalid since you're using unsupported hardware. So we'll let the xorg guys decide what to do with this.