我正在尝试让我的笔记本电脑使用 Nvidia Geforce GT 640M GPU。当我查看“软件和更新 > 附加驱动程序”面板时，它完全是空的。问题似乎出在这里：
ubuntu-drivers debug
=== log messages from detection ===
DEBUG:root:X.org log reports loaded intel driver, disabling driver nvidia-173 for hybrid system
DEBUG:root:X.org log reports loaded intel driver, disabling driver nvidia-173-updates for hybrid system
DEBUG:root:X.org log reports loaded intel driver, disabling driver nvidia-304 for hybrid system
...
lshw 的输出（如果有帮助的话）：
*-pci:0
description: PCI bridge
product: Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port
vendor: Intel Corporation
physical id: 1
bus info: pci@0000:00:01.0
version: 09
width: 32 bits
clock: 33MHz
capabilities: pci pm msi pciexpress normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:42 ioport:3000(size=4096) memory:d0000000-d1ffffff ioport:a0000000(size=536870912)
*-display
description: VGA compatible controller
product: GK107 [GeForce GT 640M]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nouveau latency=0
resources: irq:16 memory:d0000000-d0ffffff memory:a0000000-afffffff memory:b0000000-b1ffffff ioport:3000(size=128) memory:b2000000-b207ffff
*-display
description: VGA compatible controller
product: 3rd Gen Core processor Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:48 memory:d2000000-d23fffff memory:c0000000-cfffffff ioport:4000(size=64)
我如何强制 X 忽略英特尔显卡并改用 Nvida GPU？