if everything else worked to your satisfaction...it would be worthwhile to fix this.
can you look at your specs and report what the onboard video chipset is based on pls. I could not find a match in HCL so pls post the output of
but a 1500 series suggests it maybe a ati Radeon Xpress 1100 IGP but that is not going to be good enough to build a new /etc/X11/xorg.conf
and I use nvidia card so am not a fan of ati...but will try to help where possible....others can jump in anytime