Lenovo E14のLinux Mintは明るさを調整できません

私はこの世界に初めてです。したがって、F5/F6ファンクションキーはデフォルトでは機能しません。 grubを変更するためのいくつかのオンラインソリューションを試しましたが、運がありませんでした。それ自体ではなく/sys/class/backlight/でファイルを見つけることができませんでしたintel_backlight。

jing@jing-ThinkPad-E14-Gen-2:~$ sudo find /sys/ -type f -iname '*brightness*'
/sys/devices/platform/thinkpad_acpi/leds/platform::mute/brightness
/sys/devices/platform/thinkpad_acpi/leds/platform::mute/max_brightness
/sys/devices/platform/thinkpad_acpi/leds/tpacpi::thinklight/brightness
/sys/devices/platform/thinkpad_acpi/leds/tpacpi::thinklight/max_brightness
/sys/devices/platform/thinkpad_acpi/leds/tpacpi::power/brightness
/sys/devices/platform/thinkpad_acpi/leds/tpacpi::power/max_brightness
/sys/devices/platform/thinkpad_acpi/leds/tpacpi::standby/brightness
/sys/devices/platform/thinkpad_acpi/leds/tpacpi::standby/max_brightness
/sys/devices/platform/thinkpad_acpi/leds/tpacpi::thinkvantage/brightness
/sys/devices/platform/thinkpad_acpi/leds/tpacpi::thinkvantage/max_brightness
/sys/devices/platform/thinkpad_acpi/leds/tpacpi::kbd_backlight/brightness
/sys/devices/platform/thinkpad_acpi/leds/tpacpi::kbd_backlight/brightness_hw_changed
/sys/devices/platform/thinkpad_acpi/leds/tpacpi::kbd_backlight/max_brightness
/sys/devices/platform/thinkpad_acpi/leds/platform::micmute/brightness
/sys/devices/platform/thinkpad_acpi/leds/platform::micmute/max_brightness
/sys/devices/platform/i8042/serio0/input/input3/input3::numlock/brightness
/sys/devices/platform/i8042/serio0/input/input3/input3::numlock/max_brightness
/sys/devices/platform/i8042/serio0/input/input3/input3::capslock/brightness
/sys/devices/platform/i8042/serio0/input/input3/input3::capslock/max_brightness
/sys/devices/platform/i8042/serio0/input/input3/input3::scrolllock/brightness
/sys/devices/platform/i8042/serio0/input/input3/input3::scrolllock/max_brightness
/sys/devices/pci0000:00/0000:00:14.3/leds/phy0-led/brightness
/sys/devices/pci0000:00/0000:00:14.3/leds/phy0-led/max_brightness
/sys/module/video/parameters/hw_changes_brightness
/sys/module/video/parameters/brightness_switch_enabled
/sys/module/thinkpad_acpi/parameters/brightness_enable
/sys/module/thinkpad_acpi/parameters/brightness_mode
/sys/module/i915/parameters/invert_brightness