我有一台联想 IdeaPad Z500 笔记本电脑，上面安装了最新的 Kubuntu 14.04，系统是 Windows 8.1。我遇到了一个问题：Kubuntu 无法检测到我的 dGPU NVIDIA GeForce 740M。示例：
piotr@piotr-Lenovo-IdeaPad-Z500:~$ lspci
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C210 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 1 (rev c4)
00:1c.1 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 2 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM76 Express Chipset LPC Controller (rev 04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C210 Series Chipset Family SMBus Controller (rev 04)
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 05)
A 还清除了与 NVIDIA 相关的所有软件包。我不得不说，在安装 Kubuntu 后它就遇到了这个问题，但几天后这个问题又出现了。
PS 抱歉我的英语不好。如果你听不懂，我可以重写。:)
答案1
你的lspci 输出表明你现在正在使用集成英特尔图形解决方案。
从专有 GPU 驱动程序 PPA 安装支持 GT 740 的最新稳定 NVIDIA 驱动程序。
在安装新驱动程序之前，请卸载之前安装的所有 NVIDIA 相关软件。
打开终端并执行：
sudo apt-get purge '^nvidia.*'
sudo apt-get purge bumblebee
sudo reboot
然后通过执行以下操作从长期分支安装最新的当前稳定 NVIDIA 驱动程序：
sudo add-apt-repository ppa:graphics-drivers/ppa
sudo apt-get update
sudo apt-get install nvidia-352
sudo reboot
如果您使用带有混合图形解决方案的笔记本电脑，也请安装 Optimus 支持。
sudo apt-get install nvidia-prime
要在英特尔和 Nvidia 显卡之间切换 - 打开NVIDIA X 服务器设置->主要简介。
切换到后英伟达跑步命令lspci再次输出显示你的NVIDIA GT 740 GPU。