我有一台配备 NVIDIA 显卡的 Lenovo W540：
[ 0.000000] Console: colour VGA+ 80x25
[ 0.383307] vgaarb: setting as boot device: PCI:0000:00:02.0
[ 0.383308] vgaarb: device added: PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none
[ 0.383313] vgaarb: device added: PCI:0000:01:00.0,decodes=io+mem,owns=none,locks=none
[ 0.383313] vgaarb: loaded
[ 0.383314] vgaarb: bridge control possible 0000:01:00.0
[ 0.383315] vgaarb: no bridge control possible 0000:00:02.0
[ 2.296882] [drm] Replacing VGA console driver
[ 2.322942] VGA switcheroo: detected Optimus DSM method \_SB_.PCI0.PEG_.VID_ handle
[ 2.329487] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=none:owns=none
[ 4.836856] vga_switcheroo: enabled
[ 4.991385] nvidia: module license 'NVIDIA' taints kernel.
[ 4.997334] NVRM: The NVIDIA probe routine was not called for 1 device(s).
NVRM: nouveau, rivafb, nvidiafb or rivatv
NVRM: was loaded and obtained ownership of the NVIDIA device(s).
NVRM: driver(s)), then try loading the NVIDIA kernel module
[ 4.997338] NVRM: No NVIDIA graphics adapter probed!
当我使用 1920 x 1200 (16:10) 时，我可以很好地使用一台显示器，但当我连接第二个显示器时，两台显示器上的分辨率都会更改为 1024x768 (4:3)。我尝试过像 lightdm 这样的显示管理器，但没有运气。
我没有安装原始的 nvidia 驱动程序，因为我过去在使用它时遇到了很多麻烦。
我能做些什么 ？ Debian Jessie 是否可以使用两个显示器？