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513534c
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I have a similar problem in 22.04 Thinkpad 430. After coming back from standby is at lowest level and I need to increase by using the special keyboard keys. I did not have it before the upgrade in 18.04.
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Jun 28 08:59:08 username kernel: [ 4.917544] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
Jun 28 08:59:08 username kernel: [ 5.035849] thinkpad_acpi: Standard ACPI backlight interface available, not loading native one
Jun 29 09:46:20 username kernel: [51863.067875] video LNXVIDEO:00: Restoring backlight state
Jun 29 22:20:29 username kernel: [ 6.814113] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
Jun 29 22:20:29 username kernel: [ 6.894725] thinkpad_acpi: Standard ACPI backlight interface available, not loading native one
Jun 29 22:20:29 username systemd[1]: Created slice Slice /system/
Jun 29 22:20:29 username systemd[1]: Starting Load/Save Screen Backlight Brightness of leds:tpacpi:
Jun 29 22:20:29 username systemd[1]: Finished Load/Save Screen Backlight Brightness of leds:tpacpi:
Jun 29 22:20:29 username systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:
Jun 29 22:20:29 username systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:
Jun 29 22:20:29 username systemd[1]: Finished Load/Save Screen Backlight Brightness of backlight:
Jun 29 22:20:29 username systemd[1]: Finished Load/Save Screen Backlight Brightness of backlight:
Jun 30 08:00:18 username kernel: [ 5430.745580] video LNXVIDEO:00: Restoring backlight state
```