When I tried
$ inxi -Fxz
There was an entry about the graphics card as shown below
Card-2: Advanced Micro Devices [AMD/ATI] Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M] bus-ID: 01:00.0
There is no mention of 1GB graphics card in About this computer in the core, nor in tools like Stacer or Additional Drivers
Does this mean that graphics card is not working?