On Sun, 15 Aug 2021 at 21:31, John Mellor <john.mel...@gmail.com> wrote:
> > Just an update: > > The type of failure that I consistently kept seeing in the logs was > illegal addressing in high memory during shutdown. The failing address > always looked like a couple of stuck high address bits, which was > unlikely with a well-tested processor, motherboard and memory. > Sometimes that was not fatal, while other times it cause a hard crash or > a freeze. Repeated memory and motherboard testing has shown no fault, > and I've replace everything else multiple times. This kind of fault is > really tough to diagnose. Upon a lot of reflection in the middle of more > than a few nights, I upgraded the BIOS and ACPI firmware on this Lenovo > P300 from the 2016 version to the latest June/2020 version. Since then > I have not experienced a failure in 3 weeks of daily use with daily > shutdowns. > > As an aside, Lenovo does not make it easy to upgrade unless you are on > Windows -- something for the Lenovo folks to rectify in their firmware > distribution site. Thankfully the stand-alone DVD image did the trick. > > This outcome is a huge relief, but would seem to show that something in > the ACPI code is not checking for valid addresses. The newer ACPI > firmware is no longer providing bogus addresses, and the problem has > gone away -- something for the kernel people to think about and identify > the faulty/missing checks. > > I'm still waiting and watching, but the machine is now highly stable > when running Fedora. > Maybe the ACPI changes are related to ACPI Platform Profile support, see https://www.phoronix.com/scan.php?page=news_item&px=Linux-ACPI-Platform-Profile -- George N. White III
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