On Sun, Jul 7, 2019 at 6:33 PM Mark de Roussier <mark@xxxxxxxxxxxxxxxx> wrote: > > > Hi folk, > > I'm running a HP Z800 dual processor workstation which has just stopped > being able to boot properly due to a recent update. The machine has the > latest BIOS available from HP ( this was not changed by the update ). The > problem appears to relate to ACPI, and I've been referred here from a post > I made to StackExchange. > > Attempting to boot the machine using any of the available 4.15 kernels ( > 4.15.43, 4.15.45, 4.15.47, 4.15.53 ) now gives the following ACPI errors : > > --- > ACPI Error: [CAPD] Namespace lookup failure, AE_ALREADY_EXISTS > (20170831/dsfield-212) > ACPI Error: Method parse/execution failed \_SB.PCIO._OSC, AE_ALREADY_EXISTS > (20170831/psparse-550) > --- > > I usually end up dumped into what I believe is an 'emergency shell'. > > I have tried a large number of acpi related kernel switches, including > 'acpi=ht' and 'acpi_serialize'. The only thing which appears to affect > behaviour is 'acpi=off'. This causes a kernel panic, in which case I am not > given an emergency shell. I don't know how to grab that info to post here > except for taking a screenshot, and not all the info is actually on the > screen. > > So if anyone can suggest a way to further this investigation, I'd be very > grateful. What information would be useful to know, and are there any > particular experiments I should try, anyone else it would be useful to talk > to ? First off, it would be useful to try a newer kernel, preferably 5.2. That should be available from Ubuntu shortly in some form.
