https://bugzilla.kernel.org/show_bug.cgi?id=208341

            Bug ID: 208341
           Summary: Brightness-Power Supply Issue Kernel 5.8-rc2
           Product: ACPI
           Version: 2.5
    Kernel Version: 5.8-rc2
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Power-Battery
          Assignee: acpi_power-batt...@kernel-bugs.osdl.org
          Reporter: e...@gmx.com
        Regression: No

The brightness drops to minimum when removing the laptop power supply from the
wall. This bug occurs only once. Restart brings back the problem. Same if the
power-supply is not connected at boot, brightness is at very low.

This bug is present in Mint Tricia, Ubuntu 20.10, Manjaro Gnome + kde 5.19.2.

I discover this bug after a power failure on the 23rd and it has come back
since then when removing the PS.

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