Para obter informações completas sobre sua placa gráfica, temos dois métodos úteis: abra seu terminal e digite
lspci | grep VGA
exemplos de saídas:
raja@badfox:~$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset Integrated Graphics Controller (rev 03)
raja@badfox:~$
e mais uma coisa:
sudo lshw -C video
exemplo de saída, por exemplo
raja@badfox:~$ sudo lshw -C video
*-display:0
description: VGA compatible controller
product: 4 Series Chipset Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 03
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:45 memory:fd800000-fdbfffff memory:d0000000-dfffffff ioport:ff00(size=8)
*-display:1 UNCLAIMED
description: Display controller
product: 4 Series Chipset Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2.1
bus info: pci@0000:00:02.1
version: 03
width: 64 bits
clock: 33MHz
capabilities: pm cap_list
configuration: latency=0
resources: memory:fde00000-fdefffff
raja@badfox:~$
Espero que ajude, :).