ATI Radeon HD 3200 Graphics uses the RS780 chipset.
... do you get a picture off this card with vga output?
... have you tried another monitor on hdmi?
... will the monitor handle the resolution/frequency combination?
... have you checked the xorg logs?
You do not normally need a special driver for a monitor
, it is your graphics cards job to cope with this. You do need to be able to detect the modes to use though, and benq monitors are notorious for not supplying them.
The graphics cgard driver you want is called "Radeon".
HDMI audio is considered "work in progress" eg. it does not go. But the video stuff seems to have been finished. The driver is in the kernel already, so you may just need to check it is being used.
be using radeonHD - in which case kernel modesetting will give you a black screen. Make sure you are using Radeon. iirc: openSUSE still uses /etc/X11/xorg.conf, so go look.
... lots of people seem to use fglrx (from the repo is preferable to installing off the ati site) for this card.
You are not the only one: