On Wed, Jan 6, 2010 at 12:23 PM, <gene.poole at macys.com> wrote: > I recently purchased a HP Officejet Pro 8500 (A909a) and it's ethernet > attached. It's been configured and works perfectly from WinXP, Win Vista, > Windows 7, and Fedora 11 x86_64. However, on my machine running CentOS 5.4 > x86_64 I can't get the configuration to work so that it prints duplex > (2-sided). The HP Setup appears to be working from the command line, but > the graphic portion doesn't appear to work. Any ideas? I don't have that particular device but have recently configured some other HPs. Are you using the built-in CentOS utility (hplip) or the one from the HP site? I used the one from the website (hplipopensource.com) and had extremely noticeable improvement in image quality and speed, plus all the other options worked fine.