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无法在 Ubuntu 20.04 上调整亮度

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无法在 Ubuntu 20.04 上调整亮度

我在使用 Lubuntu 20.04，设置和中的亮度控制brightness-controller不起作用。

从Ubuntu 20.04 亮度调节不起作用，我尝试使用亮度控制器，但出现以下错误信息：

xrandr: Gamma size is 0.
Traceback (most recent call last):
  File "/usr/share/brightness-controller/init.py", line 277, in change_value_pbr
    Executor.execute_command(cmd_value)
  File "/usr/share/brightness-controller/util/executor.py", line 23, in execute_command
    subprocess.check_output(string_cmd, shell=True)
  File "/usr/lib/python3.8/subprocess.py", line 415, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/usr/lib/python3.8/subprocess.py", line 516, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command 'xrandr        --output default         --brightness 0.45000000000000023        --gamma 1.0000000000000007:1.0000000000000007:1.0000000000000007' returned non-zero exit status 1.

我使用的是搭载有 Nvidia 显卡的联想 Legion 5i。

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