我刚刚升级到 18.04，遇到了这个非常烦人的问题。
如果我通过 PRIME 禁用 Nvidia 卡，当我重新启动时，会出现一个黑屏，其中闪烁着启动操作，速度太快而无法读取。
我必须登录 tty 并将 Nvidia 卡重新设置为 PRIME 卡才能登录。请注意，系统不会稳定地停留在所选的 tty 中，它会随机返回 tty1，其中启动操作会随机闪烁。
lspci -k
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller (rev 09)
Subsystem: Dell 3rd Gen Core processor DRAM Controller
Kernel driver in use: ivb_uncore
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor PCI Express Root Port (rev 09)
Kernel driver in use: pcieport
Kernel modules: shpchp
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
Subsystem: Dell 3rd Gen Core processor Graphics Controller
Kernel driver in use: i915
Kernel modules: i915
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04)
Subsystem: Dell 7 Series/C210 Series Chipset Family USB xHCI Host Controller
Kernel driver in use: xhci_hcd
00:16.0 Communication controller: Intel Corporation 7 Series/C216 Chipset Family MEI Controller #1 (rev 04)
Subsystem: Dell 7 Series/C216 Chipset Family MEI Controller
Kernel driver in use: mei_me
Kernel modules: mei_me
00:1a.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family USB Enhanced Host Controller #2 (rev 04)
Subsystem: Dell 7 Series/C216 Chipset Family USB Enhanced Host Controller
Kernel driver in use: ehci-pci
00:1b.0 Audio device: Intel Corporation 7 Series/C216 Chipset Family High Definition Audio Controller (rev 04)
Subsystem: Dell 7 Series/C216 Chipset Family High Definition Audio Controller
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel
00:1c.0 PCI bridge: Intel Corporation 7 Series/C216 Chipset Family PCI Express Root Port 1 (rev c4)
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.3 PCI bridge: Intel Corporation 7 Series/C216 Chipset Family PCI Express Root Port 4 (rev c4)
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1c.5 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI Express Root Port 6 (rev c4)
Kernel driver in use: pcieport
Kernel modules: shpchp
00:1d.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family USB Enhanced Host Controller #1 (rev 04)
Subsystem: Dell 7 Series/C216 Chipset Family USB Enhanced Host Controller
Kernel driver in use: ehci-pci
00:1f.0 ISA bridge: Intel Corporation HM77 Express Chipset LPC Controller (rev 04)
Subsystem: Dell HM77 Express Chipset LPC Controller
Kernel driver in use: lpc_ich
Kernel modules: lpc_ich
00:1f.2 RAID bus controller: Intel Corporation 82801 Mobile SATA Controller [RAID mode] (rev 04)
Subsystem: Dell 82801 Mobile SATA Controller [RAID mode]
Kernel driver in use: ahci
Kernel modules: ahci
00:1f.3 SMBus: Intel Corporation 7 Series/C216 Chipset Family SMBus Controller (rev 04)
Subsystem: Dell 7 Series/C216 Chipset Family SMBus Controller
Kernel modules: i2c_i801
02:00.0 3D controller: NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT 620M/625M/630M/720M] (rev a1)
Subsystem: Dell GeForce GT 630M
Kernel driver in use: nvidia
Kernel modules: nvidiafb, nouveau, nvidia
07:00.0 Network controller: Intel Corporation Centrino Wireless-N 2230 (rev c4)
Subsystem: Intel Corporation Centrino Wireless-N 2230 BGN
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
09:00.0 Ethernet controller: Qualcomm Atheros AR8161 Gigabit Ethernet (rev 10)
Subsystem: Dell AR8161 Gigabit Ethernet
Kernel driver in use: alx
Kernel modules: alx
关于如何在使用笔记本电脑时节省能源，有什么帮助吗？