每当我启动时，我的屏幕都会出现一个黑屏，上面的文字与我点击Control Alt F1. 我的显卡是使用 Bumblebee 的 Nvidia Optimus 卡。有时还会出现“此系统以低图形模式运行”。有时它会启动，但需要多次硬重启。
这是输出lspci：
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b5)
00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b5)
00:1c.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 5 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 …