Ok, thanks for the instructions! It seems to work, this time I did 'sudo acpid' and 'acpi_listen' gave me following output (scroll the code field below to the r

Ok, thanks for the instructions! It seems to work, this time I did 'sudo acpid' and 'acpi_listen' gave me following output (scroll the code field below to the right in case my comments there are hidden): // Notebook was at the beginning unplugged $ acpi_listen ^[[14~^[[15~^[[20~ac_adapter ACPI0003:00 00000000 00000001 // I pressed three media keys and plugged in the power adapter battery PNP0C0A:00 00000080 00000001 battery PNP0C0A:00 00000081 00000001 processor LNXCPU:00 00000080 00000005 processor LNXCPU:01 00000080 00000005 processor LNXCPU:02 00000080 00000005 processor LNXCPU:03 00000080 00000005 processor LNXCPU:00 00000081 00000000 processor LNXCPU:01 00000081 00000000 processor LNXCPU:02 00000081 00000000 processor LNXCPU:03 00000081 00000000 ac_adapter ACPI0003:00 00000000 00000000 // unplugged the power adapter again battery PNP0C0A:00 00000080 00000001 battery PNP0C0A:00 00000081 00000001 processor LNXCPU:00 00000081 00000000 processor LNXCPU:01 00000081 00000000 processor LNXCPU:02 00000081 00000000 processor LNXCPU:03 00000081 00000000 ^C I'll try this at lower battery levels again tomorrow (since the battery is charged now). But it seems that the system emits charge and discharge acpi events.