Sometimes I also notice on my dmesg this: [ 1096.327517] ACPI: EC: missing confirmations, switch off interrupt mode.[ 1096.829093] ACPI Exception (evregion-0420): AE_TIME, Returned by Handler for [EmbeddedControl] [20080321] [ 1096.829119] ACPI Error (psparse-0530): Method parse/execution failed [\_TZ_.TZ4_._TMP] (Node ffff81009f0653d0), AE_TIME