1. 查找显卡的设备地址

   lspci |grep VGA
   

   00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)
   

   其中 00:02.0 指明了显卡是在哪个总线、哪个插槽上的设备、上的那个功能模块。

2. 查看详细信息

   lspci -v -s 00:02.0
   

   00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo ThinkPad T520
     Flags: bus master, fast devsel, latency 0, IRQ 30
     Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
     Memory at e0000000 (64-bit, prefetchable) [size=256M]
     I/O ports at 5000 [size=64]
     [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
     Capabilities: <access denied>
     Kernel driver in use: i915
     Kernel modules: i915
   
   

   你可以看到，GPU可预取只有4M，不可预取内存为256M，果然是个垃圾显卡啊...

lshw -C display

*-display
     description: VGA compatible controller
     product: 2nd Generation Core Processor Family Integrated Graphics Controller
     vendor: Intel Corporation
     physical id: 2
     bus info: pci@0000:00:02.0
     version: 09
     width: 64 bits
     clock: 33MHz
     capabilities: vga_controller bus_master cap_list rom
     configuration: driver=i915 latency=0
     resources: irq:30 memory:f0000000-f03fffff memory:e0000000-efffffff ioport:5000(size=64) memory:c0000-dffff

可以看到resources中 irq:30 memory:f0000000-f03fffff memory:e0000000-efffffff 前一个容量就是 4M,后一个容量就是 256M