Sometimes a newer kernel gets those working when they did nothing before. Those are ACPI controlled, I'm pretty sure. The airplane mode hotkey combo on the MSI does nothing with the 4.15 kernel, but works fine with the 4.18. However, the touchpad on-off hotkey doesn't work with either, but is not necessary with touchpad-indicator working.
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Just as the name says, here is where you can post tips and tricks to share with other users of MEPIS.