I tested v4.7-rc7, specifically this deb: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.7-rc7/linux-image-4.7.0-040700rc7-generic_4.7.0-040700rc7.201607110032_amd64.deb
It does not fix the problem, so I will be adding the kernel-bug-exists-upstream tags as you requested. The ACPI error messages have changed to reflect a newer version: ACPI Error: Method reached maximum reentrancy limit (255) (20160422/dsmethod-340) FWIW, I haven't found it necessary to install linux-header debs since the generic kernels support all the hardware on this machine and I don't need to compile any third party modules. I have also found that if the machine is idle, there's a pause in the "ACPI Error" messages. I think it depends on how much writing to disk is going on, but that's just a gut feeling. I'm not quite sure how to verify that assumption, or if it would help diagnose the problem. ** Tags added: kernel-bug-exists-upstream kernel-bug-exists- upstream-4.7-rc7 ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1603230 Title: acpi regression first bad commit 02b771b64b73226052d6e731a0987db3b47281e9 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1603230/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs