Unlocked volume buttons while screen is locked

To unlock volume buttons while the screen is locked, edit /etc/mce/mce.ini, so as parameter DisableKPImmediately in section [TKLock] equals 2.

# Policy for keypad interrupts
#
# 2 - leave keypad interrupts on even after blanking
#     (used to support pass-through of +/-)
# 1 - disable interrupts immediately
# 0 to wait until display is blanked
DisableKPImmediately=2
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