After testing the latest upstream kernel the error-output changed a litte bit: uname -a Linux MEDIABOX 4.18.0-041800rc7-generic #201807292230 SMP Sun Jul 29 22:32:13 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux ACPI: Added _OSI(Module Device) [ 0.117452] ACPI: Added _OSI(Processor Device) [ 0.117452] ACPI: Added _OSI(3.0 _SCP Extensions) [ 0.117452] ACPI: Added _OSI(Processor Aggregator Device) [ 0.117452] ACPI: Added _OSI(Linux-Dell-Video) [ 0.126991] ACPI: 2 ACPI AML tables successfully acquired and loaded [ 0.127283] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKC (20180531/dspkginit-414) [ 0.127296] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKD (20180531/dspkginit-414) [ 0.127304] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKA (20180531/dspkginit-414) [ 0.127313] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKB (20180531/dspkginit-414) [ 0.127331] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKD (20180531/dspkginit-414) [ 0.127339] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKA (20180531/dspkginit-414) [ 0.127347] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKB (20180531/dspkginit-414) [ 0.127355] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKC (20180531/dspkginit-414) [ 0.127373] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKA (20180531/dspkginit-414) [ 0.127381] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKB (20180531/dspkginit-414) [ 0.127389] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKC (20180531/dspkginit-414) [ 0.127399] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKD (20180531/dspkginit-414) [ 0.127418] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKB (20180531/dspkginit-414) [ 0.127426] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKC (20180531/dspkginit-414) [ 0.127435] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKD (20180531/dspkginit-414) [ 0.127444] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKA (20180531/dspkginit-414) [ 0.127462] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKC (20180531/dspkginit-414) [ 0.127471] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKD (20180531/dspkginit-414) [ 0.127480] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKA (20180531/dspkginit-414) [ 0.127488] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKB (20180531/dspkginit-414) [ 0.127507] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKD (20180531/dspkginit-414) [ 0.127516] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKA (20180531/dspkginit-414) [ 0.127525] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKB (20180531/dspkginit-414) [ 0.127534] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKC (20180531/dspkginit-414) [ 0.127553] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKB (20180531/dspkginit-414) [ 0.127562] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKC (20180531/dspkginit-414) [ 0.127571] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKD (20180531/dspkginit-414) [ 0.127579] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKA (20180531/dspkginit-414) [ 0.127598] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKC (20180531/dspkginit-414) [ 0.127607] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKD (20180531/dspkginit-414) [ 0.127616] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKA (20180531/dspkginit-414) [ 0.127624] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKB (20180531/dspkginit-414) [ 0.127643] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKD (20180531/dspkginit-414) [ 0.127652] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKA (20180531/dspkginit-414) [ 0.127661] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKB (20180531/dspkginit-414) [ 0.127670] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKC (20180531/dspkginit-414) [ 0.127688] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKA (20180531/dspkginit-414) [ 0.127697] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKB (20180531/dspkginit-414) [ 0.127706] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKC (20180531/dspkginit-414) [ 0.127715] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - LNKD (20180531/dspkginit-414) [ 0.127771] ACPI Error: AE_NOT_FOUND, While resolving a named reference package element - \_PR_.CPU0 (20180531/dspkginit-414) [ 0.131332] ACPI: Interpreter enabled [ 0.131361] ACPI: (supports S0 S1 S4 S5) [ 0.131363] ACPI: Using IOAPIC for interrupt routing [ 0.131478] PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug [ 0.131772] ACPI: Enabled 6 GPEs in block 00 to 1F [ 0.139693] ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])