ATI Mobility Radeon 7500
Linux driver - OpenSource
This adapter is supported by recent versions of the 'radeon' driver as found in X.Org and XFree86.
Display on the internal LCD works as long as you set the monitor settings correct
External VGA port
Works fine with open-source drivers. It turns on automatically when an external display is present. It can also be used for dualhead with Xinerama (with different resolutions on both screens) or MergedFB.
This video controller does not support DVI
Linux driver - Proprietary
ATi's proprietary Linux drivers support only the R200/FireGL graphics chips and above. The Mobility Radeon 7500 is based on the R100 graphics chip, so the only driver available for Linux is through the open-source radeon DRI.