From: Deak, Imre Subject: 4.9-rc1: [TMP_] ACPI namespace lookup failure, AE_ALREADY_EXISTS Hi, after upgrading to 4.9-rc1 I get the following errors occasionally during boot and suspend-to-ram on an APL system: [   59.513434] ACPI Error: [TMP_] Namespace lookup failure, AE_ALREADY_EXISTS (20160831/dswload2-330) [   59.513446] ACPI Exception: AE_ALREADY_EXISTS, During name lookup/catalog (20160831/psobject-227) [   59.513469] ACPI Error: Method parse/execution failed [\_SB.PCI0.SCPG] (Node ffff8802770b7bb8), AE_ALREADY_EXISTS (20160831/psparse-543) [   59.515415] ACPI Error: Method parse/execution failed [\_SB.PCI0.SDHA._PS3] (Node ffff8802770b7dc0), AE_ALREADY_EXISTS (20160831/psparse-543) [   59.517118] ACPI: Marking method _PS3 as Serialized because of AE_ALREADY_EXISTS error Other than these error messages, booting and suspend/resume seems to work ok. Bisecting points to commit 74f51b80a0c4ff84fbeb7f12ea43ce66934d29aa Author: Lv Zheng <lv.zheng(a)intel.com&gt; Date:   Wed Sep 7 14:07:10 2016 +0800     ACPICA: Namespace: Fix dynamic table loading issues Reverting this on top of 4.9-rc1 gets rid of the error messages.