因此，与许多其他用户一样，我无法使用 Fn 键或设置中的亮度控件来设置笔记本电脑的亮度。
我已经尝试了所有我能解决的解决方案，但没有任何反应。
使用不同选项更新 grub 配置
acpi_backlight
不起作用我尝试更改 BIOS 中的选项，
Graphic device但
switchable graphics最终在启动过程中出现黑屏
。使用
xrandr --output DP_2 --brightness 0.8允许改变
“亮度”，但实际上只影响伽玛。使用
xbacklight -set 50也没有效果/sys/class/backlight/acpi_video0/brightness直接在、/sys/class/backlight/actual_brightness或中更改亮度值/sys/class/backlight/max_brightness不起作用。
我也一直在查看 arch wiki (背光）并发现了一些奇怪的东西。
维基百科说：
通过设置背光 LED 或阴极的功率级别来调整屏幕背光的亮度。通常可以使用视频的 ACPI 内核模块来控制功率级别。该模块的接口是通过 sysfs 目录提供的
/sys/class/backlight/。该目录的名称取决于显卡型号。
$ ls /sys/class/backlight/ acpi_video0在这种情况下，背光由 ATI 显卡管理。对于 Intel 卡，该目录称为
intel_backlight.在以下示例中，acpi_video0使用 。如果您使用 Intel 卡，只需在示例中替换acpi_video0为即可。intel_backlight
当我这样做时，我会根据我的笔记本电脑规格ls /sys/class/backlight/获得目录（acpi_video0联想拯救者Y540）和lshw命令（见下文） 我没有 ATI 组件。我的显卡是 Nvidia RTX 2060。
- 我该如何解决亮度控制问题？
- 是我的发行版（流行操作系统 19.10）没有正确找到我的笔记本电脑的硬件？
Switchable graphics为什么我在BIOS中设置时会出现黑屏？
sudo lshw
lenovo-y540
description: Notebook
product: 81SX (LENOVO_MT_81SX_BU_idea_FM_Legion Y540-15IRH)
vendor: LENOVO
version: Legion Y540-15IRH
serial: PF14675L
width: 64 bits
capabilities: smbios-3.0.1 dmi-3.0.1 smp vsyscall32
configuration: administrator_password=disabled boot=normal chassis=notebook family=Legion Y540-15IRH frontpanel_password=disabled keyboard_password=disabled power-on_password=disabled sku=LENOVO_MT_81SX_BU_idea_FM_Legion Y540-15IRH uuid=98D5B7D7-C3C3-E911-80D8-98FA9BA0B3AE
*-core
description: Motherboard
product: LNVNB161216
vendor: LENOVO
physical id: 0
version: SDK0R32862 WIN
serial: PF14675L
slot: Type2 - Board Chassis Location
*-firmware
description: BIOS
vendor: LENOVO
physical id: 0
version: BHCN29WW
date: 06/19/2019
size: 128KiB
capacity: 10MiB
capabilities: pci upgrade shadowing cdboot bootselect edd int13floppynec int13floppytoshiba int13floppy360 int13floppy1200 int13floppy720 int13floppy2880 int9keyboard int10video acpi usb biosbootspecification uefi
*-cpu
description: CPU
product: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
vendor: Intel Corp.
physical id: 4
bus info: cpu@0
version: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
serial: To Be Filled By O.E.M.
slot: U3E1
size: 2523MHz
capacity: 4500MHz
width: 64 bits
clock: 100MHz
capabilities: lm fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp x86-64 constant_tsc art arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb invpcid_single pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid ept_ad fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid mpx rdseed adx smap clflushopt intel_pt xsaveopt xsavec xgetbv1 xsaves dtherm ida arat pln pts hwp hwp_notify hwp_act_window hwp_epp md_clear flush_l1d cpufreq
configuration: cores=6 enabledcores=6 threads=12
*-cache:0
description: L1 cache
physical id: 5
slot: L1 Cache
size: 384KiB
capacity: 384KiB
capabilities: synchronous internal write-back unified
configuration: level=1
*-cache:1
description: L2 cache
physical id: 6
slot: L2 Cache
size: 1536KiB
capacity: 1536KiB
capabilities: synchronous internal write-back unified
configuration: level=2
*-cache:2
description: L3 cache
physical id: 7
slot: L3 Cache
size: 12MiB
capacity: 12MiB
capabilities: synchronous internal write-back unified
configuration: level=3
*-memory
description: System Memory
physical id: 25
slot: System board or motherboard
size: 16GiB
*-bank:0
description: SODIMM DDR4 Synchronous 2667 MHz (0,4 ns)
product: M471A1K43DB1-CTD
vendor: Samsung
physical id: 0
serial: 335E0974
slot: ChannelA-DIMM0
size: 8GiB
width: 64 bits
clock: 2667MHz (0.4ns)
*-bank:1
description: SODIMM DDR4 Synchronous 2667 MHz (0,4 ns)
product: M471A1K43DB1-CTD
vendor: Samsung
physical id: 1
serial: 335E04AB
slot: ChannelB-DIMM0
size: 8GiB
width: 64 bits
clock: 2667MHz (0.4ns)
*-pci
description: Host bridge
product: 8th Gen Core Processor Host Bridge/DRAM Registers
vendor: Intel Corporation
physical id: 100
bus info: pci@0000:00:00.0
version: 07
width: 32 bits
clock: 33MHz
configuration: driver=skl_uncore
resources: irq:0
*-pci:0
description: PCI bridge
product: Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor PCIe Controller (x16)
vendor: Intel Corporation
physical id: 1
bus info: pci@0000:00:01.0
version: 07
width: 32 bits
clock: 33MHz
capabilities: pci pm msi pciexpress normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:121 ioport:4000(size=4096) memory:a0000000-b40fffff ioport:b4100000(size=1048576)
*-display
description: VGA compatible controller
product: TU106M [GeForce RTX 2060 Mobile]
vendor: NVIDIA Corporation
physical id: 0
bus info: pci@0000:01:00.0
version: a1
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
configuration: driver=nvidia latency=0
resources: irq:129 memory:b3000000-b3ffffff memory:a0000000-afffffff memory:b0000000-b1ffffff ioport:4000(size=128) memory:b2000000-b207ffff
*-multimedia
description: Audio device
product: TU106 High Definition Audio Controller
vendor: NVIDIA Corporation
physical id: 0.1
bus info: pci@0000:01:00.1
version: a1
width: 32 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:17 memory:b4000000-b4003fff
*-usb
description: USB controller
product: TU106 USB 3.1 Host Controller
vendor: NVIDIA Corporation
physical id: 0.2
bus info: pci@0000:01:00.2
version: a1
width: 64 bits
clock: 33MHz
capabilities: msi pciexpress pm xhci cap_list
configuration: driver=xhci_hcd latency=0
resources: irq:125 memory:b4100000-b413ffff memory:b4140000-b414ffff
*-usbhost:0
product: xHCI Host Controller
vendor: Linux 5.3.0-7648-generic xhci-hcd
physical id: 0
bus info: usb@3
logical name: usb3
version: 5.03
capabilities: usb-2.00
configuration: driver=hub slots=2 speed=480Mbit/s
*-usbhost:1
product: xHCI Host Controller
vendor: Linux 5.3.0-7648-generic xhci-hcd
physical id: 1
bus info: usb@4
logical name: usb4
version: 5.03
capabilities: usb-3.10
configuration: driver=hub slots=4 speed=10000Mbit/s
*-serial UNCLAIMED
description: Serial bus controller
product: TU106 USB Type-C Port Policy Controller
vendor: NVIDIA Corporation
physical id: 0.3
bus info: pci@0000:01:00.3
version: a1
width: 32 bits
clock: 33MHz
capabilities: msi pciexpress pm cap_list
configuration: latency=0
resources: memory:b4004000-b4004fff
*-generic:0
description: Signal processing controller
product: Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem
vendor: Intel Corporation
physical id: 4
bus info: pci@0000:00:04.0
version: 07
width: 64 bits
clock: 33MHz
capabilities: msi pm bus_master cap_list
configuration: driver=proc_thermal latency=0
resources: irq:16 memory:b4510000-b4517fff
*-generic:1 UNCLAIMED
description: System peripheral
product: Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th Gen Core Processor Gaussian Mixture Model
vendor: Intel Corporation
physical id: 8
bus info: pci@0000:00:08.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: msi pm bus_master cap_list
configuration: latency=0
resources: memory:b4524000-b4524fff
*-generic:2
description: Signal processing controller
product: Cannon Lake PCH Thermal Controller
vendor: Intel Corporation
physical id: 12
bus info: pci@0000:00:12.0
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=intel_pch_thermal latency=0
resources: irq:16 memory:b4525000-b4525fff
*-usb
description: USB controller
product: Cannon Lake PCH USB 3.1 xHCI Host Controller
vendor: Intel Corporation
physical id: 14
bus info: pci@0000:00:14.0
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm msi xhci bus_master cap_list
configuration: driver=xhci_hcd latency=0
resources: irq:124 memory:b4500000-b450ffff
*-usbhost:0
product: xHCI Host Controller
vendor: Linux 5.3.0-7648-generic xhci-hcd
physical id: 0
bus info: usb@1
logical name: usb1
version: 5.03
capabilities: usb-2.00
configuration: driver=hub slots=16 speed=480Mbit/s
*-usb:0
description: Generic USB device
product: iPhone
vendor: Apple Inc.
physical id: 2
bus info: usb@1:2
version: 8.01
serial: 237e4af9d8a88c3127e28e56dce2fea65bb7d1b4
capabilities: usb-2.00
configuration: driver=ipheth maxpower=500mA speed=480Mbit/s
*-usb:1
description: Video
product: Integrated Camera
vendor: SunplusIT Inc
physical id: 6
bus info: usb@1:6
version: 54.23
capabilities: usb-2.01
configuration: driver=uvcvideo maxpower=500mA speed=480Mbit/s
*-usb:2
description: Keyboard
product: ITE Device(8910)
vendor: ITE Tech. Inc.
physical id: 9
bus info: usb@1:9
version: 0.43
capabilities: usb-1.10
configuration: driver=usbhid maxpower=100mA speed=12Mbit/s
*-usb:3
description: Bluetooth wireless interface
vendor: Intel Corp.
physical id: e
bus info: usb@1:e
version: 0.02
capabilities: bluetooth usb-2.00
configuration: driver=btusb maxpower=100mA speed=12Mbit/s
*-usbhost:1
product: xHCI Host Controller
vendor: Linux 5.3.0-7648-generic xhci-hcd
physical id: 1
bus info: usb@2
logical name: usb2
version: 5.03
capabilities: usb-3.10
configuration: driver=hub slots=8 speed=10000Mbit/s
*-memory UNCLAIMED
description: RAM memory
product: Cannon Lake PCH Shared SRAM
vendor: Intel Corporation
physical id: 14.2
bus info: pci@0000:00:14.2
version: 10
width: 64 bits
clock: 33MHz (30.3ns)
capabilities: pm bus_master cap_list
configuration: latency=0
resources: memory:b4520000-b4521fff memory:b4526000-b4526fff
*-network
description: Wireless interface
product: Wireless-AC 9560 [Jefferson Peak]
vendor: Intel Corporation
physical id: 14.3
bus info: pci@0000:00:14.3
logical name: wlp0s20f3
version: 10
serial: 50:e0:85:c6:2f:be
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=5.3.0-7648-generic firmware=46.6bf1df06.0 ip=192.168.1.10 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:16 memory:b4518000-b451bfff
*-serial:0
description: Serial bus controller
product: Cannon Lake PCH Serial IO I2C Controller #0
vendor: Intel Corporation
physical id: 15
bus info: pci@0000:00:15.0
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=intel-lpss latency=0
resources: irq:16 memory:b4527000-b4527fff
*-serial:1
description: Serial bus controller
product: Cannon Lake PCH Serial IO I2C Controller #1
vendor: Intel Corporation
physical id: 15.1
bus info: pci@0000:00:15.1
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=intel-lpss latency=0
resources: irq:17 memory:b4528000-b4528fff
*-communication:0
description: Communication controller
product: Cannon Lake PCH HECI Controller
vendor: Intel Corporation
physical id: 16
bus info: pci@0000:00:16.0
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=mei_me latency=0
resources: irq:142 memory:b4529000-b4529fff
*-sata
description: SATA controller
product: Cannon Lake Mobile PCH SATA AHCI Controller
vendor: Intel Corporation
physical id: 17
bus info: pci@0000:00:17.0
version: 10
width: 32 bits
clock: 66MHz
capabilities: sata msi pm ahci_1.0 bus_master cap_list
configuration: driver=ahci latency=0
resources: irq:126 memory:b4522000-b4523fff memory:b452e000-b452e0ff ioport:5040(size=8) ioport:5048(size=4) ioport:5020(size=32) memory:b452d000-b452d7ff
*-pci:1
description: PCI bridge
product: Cannon Lake PCH PCI Express Root Port #9
vendor: Intel Corporation
physical id: 1d
bus info: pci@0000:00:1d.0
version: f0
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:122 memory:b4400000-b44fffff
*-storage
description: Non-Volatile memory controller
product: Micron Technology Inc
vendor: Micron Technology Inc
physical id: 0
bus info: pci@0000:06:00.0
version: 01
width: 64 bits
clock: 33MHz
capabilities: storage pciexpress msix msi pm nvm_express bus_master cap_list
configuration: driver=nvme latency=0
resources: irq:16 memory:b4400000-b4403fff
*-pci:2
description: PCI bridge
product: Cannon Lake PCH PCI Express Root Port #14
vendor: Intel Corporation
physical id: 1d.5
bus info: pci@0000:00:1d.5
version: f0
width: 32 bits
clock: 33MHz
capabilities: pci pciexpress msi pm normal_decode bus_master cap_list
configuration: driver=pcieport
resources: irq:123 ioport:3000(size=4096) memory:b4300000-b43fffff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:07:00.0
logical name: enp7s0
version: 15
serial: 98:fa:9b:a0:b3:ae
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 firmware=rtl8168h-2_0.0.2 02/26/15 latency=0 link=no multicast=yes port=MII
resources: irq:17 ioport:3000(size=256) memory:b4304000-b4304fff memory:b4300000-b4303fff
*-communication:1
description: Communication controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 1e
bus info: pci@0000:00:1e.0
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm bus_master cap_list
configuration: driver=intel-lpss latency=0
resources: irq:20 memory:b452a000-b452afff
*-isa
description: ISA bridge
product: Intel Corporation
vendor: Intel Corporation
physical id: 1f
bus info: pci@0000:00:1f.0
version: 10
width: 32 bits
clock: 33MHz
capabilities: isa bus_master
configuration: latency=0
*-multimedia
description: Audio device
product: Cannon Lake PCH cAVS
vendor: Intel Corporation
physical id: 1f.3
bus info: pci@0000:00:1f.3
version: 10
width: 64 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list
configuration: driver=snd_hda_intel latency=32
resources: irq:157 memory:b451c000-b451ffff memory:b4200000-b42fffff
*-serial:2
description: SMBus
product: Cannon Lake PCH SMBus Controller
vendor: Intel Corporation
physical id: 1f.4
bus info: pci@0000:00:1f.4
version: 10
width: 64 bits
clock: 33MHz
configuration: driver=i801_smbus latency=0
resources: irq:16 memory:b452b000-b452b0ff ioport:5000(size=32)
*-serial:3 UNCLAIMED
description: Serial bus controller
product: Cannon Lake PCH SPI Controller
vendor: Intel Corporation
physical id: 1f.5
bus info: pci@0000:00:1f.5
version: 10
width: 32 bits
clock: 33MHz
capabilities: bus_master
configuration: latency=0
resources: memory:fe010000-fe010fff
*-pnp00:00
product: PnP device PNP0c02
physical id: 1
capabilities: pnp
configuration: driver=system
*-pnp00:01
product: PnP device PNP0c02
physical id: 2
capabilities: pnp
configuration: driver=system
*-pnp00:02
product: PnP device PNP0c02
physical id: 3
capabilities: pnp
configuration: driver=system
*-pnp00:03
product: PnP device PNP0c02
physical id: 5
capabilities: pnp
configuration: driver=system
*-pnp00:04
product: PnP device INT3f0d
physical id: 6
capabilities: pnp
configuration: driver=system
*-pnp00:05
product: PnP device PNP0303
physical id: 7
capabilities: pnp
configuration: driver=i8042 kbd
*-pnp00:06
product: PnP device PNP0c02
physical id: 8
capabilities: pnp
configuration: driver=system
*-pnp00:07
product: PnP device PNP0c02
physical id: 9
capabilities: pnp
configuration: driver=system
*-battery
description: Zinc Air Battery
product: CRB Battery 0
vendor: -Virtual Battery 0-
physical id: 1
version: 08/08/2010
serial: Battery 0
slot: Fake
*-power UNCLAIMED
description: OEM Define 1
product: OEM Define 5
vendor: OEM Define 2
physical id: 2
version: OEM Define 6
serial: OEM Define 3
capacity: 75mWh
*-network
description: Ethernet interface
physical id: 3
bus info: usb@1:2
logical name: enp0s20f0u2c4i2
serial: 9e:f4:8e:80:a8:d1
capabilities: ethernet physical
configuration: broadcast=yes driver=ipheth link=no multicast=yes
答案1
Lenovo Legion 5、Manjaro、nvidia 1650 也遇到同样的问题。解决方案对我来说略有不同。安装最后一个可用的 nvidia 驱动程序 (video-nvidia-450xx)、在 UEFI / BIOS 中将图形选项从 更改为Switchable graphics并创建此文件后，它就可以工作了：Discrete
sudo nano /usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf
包含以下内容：
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "Quadro K1000M" #this value had no effect for me
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection