On 09/22/2017 03:34 AM, Jeremiah Rothschild wrote: > On Fri, Sep 22, 2017 at 08:14:03AM +0100, Gordan Bobic wrote: >> Do you have any PCIe cards in yours? > > Actually, no. > >> What is DT mode? >> >> >From my understanding of the thread so far, both Jeremiah and I are running >> Tianocore UEFI firmware, chain loaded from u-boot. > > That's right. I originally miscommented that I was not running UEFI then > later followed up that I was. > Keep in mind that this doesn't mean the UEFI being used is getting the right EFI variables populated on its journey through uboot to a running system. Not all UEFI is equal. > It seems fairly clear to me that someone introduced an ACPI related bug in > 4.5.0-25 and onwards. My system was always fine and always able to boot > without adding 'acpi=off' until that version. > The OS is built to expect ACPI. That reliance will increase as it progresses. As has been suggested previously, you should really consider moving to a supported boot platform rather than chainloading. There are a number of improvements in the new official AMI firmwares that the distro takes advantage of. I don't see this as an ACPI bug, but rather a fix that closes bugs you were using as features until the more recent kernels. -- Jim Perrin The CentOS Project | http://www.centos.org twitter: @BitIntegrity | GPG Key: FA09AD77