Hi Bjørn, On Sat, Aug 21, 2021 at 4:38 PM Bjørn Mork <bj...@mork.no> wrote:
> Great! Glad it could be resolved as easily as that. > > Probably a firmware bug. I don't know. Such issues are pretty common, > and disabling the IOMMU is the first thing you should try. Sometimes > it just doesn't play well with some other feature. If you don't need > it then you might as well just disable it. > > My Thinkpad fails to suspend if I enable both IOMMU and TPM 2.0. One of > them is OK, but not both. Go figure. This is https://bugs.debian.org/949020 > > For some background: > https://www.kernel.org/doc/html/latest/x86/intel-iommu.html > > There are also a number of other options than "off" you could try if you > want to play with it: > https://www.kernel.org/doc/html/v4.14/admin-guide/kernel-parameters.html > > Note that the bug has probably always been there in your PC firmware. > It showed up now because Debian changed the default from "off" to "on". > > Bjørn Thanks for the explanation, very helpful! Nikolay