ubuntu18.04 2700x+rtx2070独显 如何调整屏幕亮度？

[Gavava]

机器只有独显，安装了430的驱动。
sys/class/backlight/下是空的。
尝试过下面的步骤，没有成功。

1. Inside /etc/default/grub modified the line GRUB_CMDLINE_LINUX_DEFAULT as follows:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
executed: sudo update-grub and rebooted

2. Created a file /etc/modprobe.d/99-nvidia-backlight.conf
Put: options nvidia NVreg_EnableBacklightHandler=1
inside the file and
executed: sudo update-initramfs -u

3. Created a file /usr/share/X11/xorg.conf.d/12-nvidia.conf
Put the following in the file:

Section "OutputClass"
Identifier "nvidia"
MatchDriver "nvidia-drm"
Driver "nvidia"
Option "AllowEmptyInitialConfiguration"
Option "RegistryDwords" "EnableBrightnessControl=1;"
ModulePath "/usr/lib/x86_64-linux-gnu/nvidia/xorg"
EndSection

Rebooted

使用命令sudo setpci -s 1c:00.0 F4.B=FF调节亮度也没反应。
1c:00.0 VGA compatible controller: NVIDIA Corporation Device 1f02 (rev a1)

求助怎么能调节显示器亮度？

[* ॑꒳ ॑*]

我也遇到这个问题，用了网上的办法都不行，请问lz解决了吗？