Thanks Tinkster
lspci shows the following graphics adapters (I think, I am not experienced in these things)
05:00.0 VGA compatible controller: ATI Technologies Inc Juniper [Radeon HD 5700 Series]
05:00.1 Audio device: ATI Technologies Inc Juniper HDMI Audio [Radeon HD 5700 Series]
06:00.0 VGA compatible controller: ATI Technologies Inc Juniper [Radeon HD 5700 Series]
06:00.1 Audio device: ATI Technologies Inc Juniper HDMI Audio [Radeon HD 5700 Series]
Not sure what to look for in Xorg.0.log (there is a Xorg.1.log as well)? These are long files. Could anyone direct me? Just in case, I am attaching the two files here.