nixos: KDE powermanagement没有亮度控制

Question

我无法在KDE中控制屏幕亮度(电源管理已启用，但我在电源管理小部件中看不到亮度控制。亮度键以前也能用，但现在不能用了)。我在不稳定频道上，它在19.03版本中起作用

电池和亮度设置(电源管理小部件)

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虽然在启动时，Powerdevil、upower似乎运行得没有错误

这似乎是相关的-

journalctl -xb | grep brightness
Oct 09 08:47:25 blackbox kernel: thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
Oct 09 08:47:25 blackbox kernel: thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...
Oct 09 08:47:43 blackbox xsession[1343]: invalid metadata "/run/current-system/sw/lib/qt-5.12.3/plugins/powerdevilkeyboardbrightnesscontrolaction_config.so"
Oct 09 08:47:43 blackbox xsession[1343]: invalid metadata "/run/current-system/sw/lib/qt-5.12.3/plugins/powerdevilbrightnesscontrolaction_config.so"
Oct 09 08:47:45 blackbox xsession[1343]: powerdevil: Falling back to helper to get brightness
Oct 09 08:47:45 blackbox xsession[1343]: powerdevil: "DBus Backend error: service start org.kde.powerdevil.backlighthelper failed: Bus name not found in system service directory"

系统信息

nix-info
system: "x86_64-linux",
multi-user?: yes, 
version: nix-env (Nix) 2.3,
channels(root):
"nixos-20.03pre196201.07d4df59626, home-manager, nixos-hardware"

neofetch --stdout
xxx@blackbox
-----------------
OS: NixOS 20.03pre196201.07d4df59626 (Markhor) x86_64
Host: 20KGSBP200 ThinkPad X1 Carbon 6th
Kernel: 4.19.75
Uptime: 1 day, 4 hours, 16 mins
Packages: 1005 (nix-system), 1152 (nix-user)
Shell: zsh 5.7.1
Resolution: 2560x1440
DE: Plasma
WM: KWin
Theme: Breeze [GTK2]
Icons: breeze [GTK2]
CPU: Intel i5-8350U (8) @ 3.600GHz
Memory: 3920MiB / 15919MiB

Answer 1

我也有同样的问题，并通过卸载GPU的Nvidia专有驱动程序来修复它，而使用的是开源Linux驱动程序。