Comment 284 for bug 1776563

FWIW...Last night, I upgraded Debian9 from stock kernel 4.9 -> 4.18 using debian-backports. Very important, forced the amd-gpu firmware to the backported version also. Have ivrs_ioapic[4]=00:14.0 ivrs_ioapic[5]=0:00.2 added to my grub config permanently. No boot errors and it is using the raven ridge dgpu drivers [DRM]. Suspend works a treat and left it on for almost 24hrs, no lockups. Runs cool, with the fan hardly coming on [low RPM]. Seems quite stable. This may be of help to anyone that needs a distro to use for the time being. According to my research, seems a lot of these issues are due to buggy BIOS acpi tables and lack of raven ridge dgpu support in the kernel.