I have the same type of notebook (HP nw8240) with ATI FireGL V5000 and do not have sync problems (only issue that LCD is not enabled without MonitorLayout hint in xorg.conf - see bug 29357).
Do you have the latest BIOS installed? There were some fixes for Video BIOS last year: http://h18007.www1.hp.com/support/files/hpcpqnk/us/revision/9005.html
I have the same type of notebook (HP nw8240) with ATI FireGL V5000 and do not have sync problems (only issue that LCD is not enabled without MonitorLayout hint in xorg.conf - see bug 29357).
Do you have the latest BIOS installed? h18007. www1.hp. com/support/ files/hpcpqnk/ us/revision/ 9005.html
There were some fixes for Video BIOS last year:
http://