闭源驱动的话，N卡设置那里有的。或者apt search xserver-xorg-video，有安装的会有提示已安装

ganghao@ganghao-PC:~$ apt search xserver-xorg-video
正在排序... 完成
全文搜索... 完成  
xserver-xorg-video-all/未知,now 1:7.7+19 amd64 [已安装] xserver-xorg-video-amdgpu/未知,now 18.1.99.1-1+eagle amd64 [已安装]
  X.Org X server -- AMDGPU display driver

xserver-xorg-video-amdgpu-dbgsym/未知 18.1.99.1-1+eagle amd64
  debug symbols for xserver-xorg-video-amdgpu

xserver-xorg-video-ast/未知 1.1.5-1.1+b1 amd64
  X.Org X server -- ASpeed Technologies display driver

xserver-xorg-video-ati/未知,now 1:19.0.2.2-1+eagle amd64 [已安装]
  X.Org X server -- AMD/ATI display driver wrapper

xserver-xorg-video-ati-dbgsym/未知 1:19.0.2.2-1+eagle amd64
  debug symbols for xserver-xorg-video-ati

xserver-xorg-video-cirrus/未知 1:1.5.3-1+b3 amd64
  X.Org X server -- Cirrus display driver

xserver-xorg-video-dummy/未知 1:0.3.8-1+b1 amd64
  X.Org X server -- dummy display driver

xserver-xorg-video-fbdev/未知,now 1:0.5.0-1 amd64 [已安装]
  X.Org X server -- fbdev display driver

xserver-xorg-video-fbdev-dbgsym/未知 1:0.5.0-1 amd64
  debug symbols for xserver-xorg-video-fbdev

xserver-xorg-video-geode/未知 2.11.19-4 i386
  X.Org X server -- Geode GX2/LX display driver

xserver-xorg-video-glide/未知 1.2.2-1+b7 amd64
  X.Org X server -- Glide display driver

xserver-xorg-video-intel/未知,now 2:2.99.917+git20180925-2 amd64 [已安装]
  X.Org X server -- Intel i8xx, i9xx display driver

xserver-xorg-video-ivtv/未知 1.1.2-2+b6 amd64
  X.Org X server -- IVTV display driver

xserver-xorg-video-ivtv-dbg/未知 1.1.2-2+b6 amd64
  X.Org X server -- IVTV display driver (debug symbols)

xserver-xorg-video-mach64/未知 6.9.6-1 amd64
  X.Org X server -- ATI Mach64 display driver

xserver-xorg-video-mga/未知 1:2.0.0-1 amd64
  X.Org X server -- MGA display driver

xserver-xorg-video-neomagic/未知 1:1.3.0-1 amd64
  X.Org X server -- Neomagic display driver

xserver-xorg-video-nouveau/未知,now 1:1.0.16-1 amd64 [已安装]
  X.Org X server -- Nouveau display driver

xserver-xorg-video-nouveau-dbgsym/未知 1:1.0.16-1 amd64
  debug symbols for xserver-xorg-video-nouveau

xserver-xorg-video-nvidia/未知 440.59-1~bpo10+1 amd64
  NVIDIA binary Xorg driver

xserver-xorg-video-nvidia-legacy-340xx/未知 340.107-4 amd64
  NVIDIA binary Xorg driver (340xx legacy version)

xserver-xorg-video-nvidia-legacy-390xx/未知 390.132-3~deb10u1 amd64
  NVIDIA binary Xorg driver (390xx legacy version)

xserver-xorg-video-openchrome/未知 1:0.6.0-3+b1 amd64
  X.Org X server -- OpenChrome display driver

xserver-xorg-video-qxl/未知 0.1.5.1-1+rebuild amd64
  X.Org X server -- QXL display driver

xserver-xorg-video-qxl-dbgsym/未知 0.1.5.1-1+rebuild amd64
  debug symbols for xserver-xorg-video-qxl

xserver-xorg-video-r128/未知 6.12.0-1 amd64
  X.Org X server -- ATI r128 display driver

xserver-xorg-video-radeon/未知,now 1:19.0.2.2-1+eagle amd64 [已安装]
  X.Org X server -- AMD/ATI Radeon display driver

xserver-xorg-video-radeon-dbgsym/未知 1:19.0.2.2-1+eagle amd64
  debug symbols for xserver-xorg-video-radeon

xserver-xorg-video-savage/未知 1:2.3.9-2 amd64
  X.Org X server -- Savage display driver

xserver-xorg-video-siliconmotion/未知 1:1.7.9-2+b1 amd64
  X.Org X server -- SiliconMotion display driver

xserver-xorg-video-sisusb/未知 1:0.9.7-1+b1 amd64
  X.Org X server -- SiS USB display driver

xserver-xorg-video-tdfx/未知 1:1.4.7-1+b1 amd64
  X.Org X server -- tdfx display driver

xserver-xorg-video-trident/未知 1:1.3.8-1+b1 amd64
  X.Org X server -- Trident display driver

xserver-xorg-video-vesa/未知,now 1:2.4.0-1 amd64 [已安装]
  X.Org X server -- VESA display driver

xserver-xorg-video-vesa-dbgsym/未知 1:2.4.0-1 amd64
  debug symbols for xserver-xorg-video-vesa

xserver-xorg-video-vmware/未知,now 1:13.3.0-2 amd64 [已安装]
  X.Org X server -- VMware display driver
看不懂。
我装beta版本的时候经常因为显卡死机。升级到deepin20正式版本后，就没有死机了。

xserver-xorg-video-radeon/未知,now 1:19.0.2.2-1+eagle amd64 [已安装]
应该是这个

双显卡，intel和ATI显卡吧？