same issue on Dell XPS 15-i9. using kernel 5.13.0-28-generic. These three errors appear in dmesg, usually in succession.
ACPI Error: Aborting method \_SB.PCI0.LPCB.ECDV._Q66 due to previous error (AE_AML_NOT_OWNER) (20210331/psparse-529) i915 0000:00:02.0: [drm] *ERROR* Atomic update failure on pipe A (start=432243 end=432244) time 843 us, min 2385, max 2399, scanline start 2345, end 0 ACPI Error: Thread 1882606336 cannot release Mutex [ECMX] acquired by thread 2269184000 (20210331/exmutex-378) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1920847 Title: ACPI Error: Aborting method \_SB.PCI0.LPCB.ECDV._Q66 due to previous error (AE_AML_NOT_OWNER) (20200528/psparse-529) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-signed-hwe-5.8/+bug/1920847/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
