On Thu, Aug 22, 2019, at 07:26, Johan Kröckel wrote:
> my system (Thinkstation c20) does not wake up from suspend to ram when
> "Interrupt remapping" is enabled in BIOS. Took me some time to find the
> problem and I wanted to report a bug. Towards which package should I report
> it?
> System is Buster.
Well, it is a BIOS+kernel issue.
This is a X58 or 5520 chipset system (tylesburg 36D) according to @lenovo.com.
Interrupt remapping is non-functional on these systems due to chipset errata
(read: hardware defect). Do not enable it, unless you know for sure you have a
fixed stepping of the chipset (note that I am not sure such a fixed stepping
was ever released).
As for where to file a bug, well, the Linux kernel apparently is not
force-disabling interrupt remapping on resume. If it is doing so on boot, it
is a kernel bug to not do so on resume...
That said, please make sure you have the latest version of the thinkstation c20
firmware (BIOS, etc). It is a BIOS bug to even offer to enable interrupt
remapping on a non-fixed version of the chipset in the first place.
--
Henrique de Moraes Holschuh
