https://bugzilla.kernel.org/show_bug.cgi?id=201753 --- Comment #32 from David Coe (david.coe@xxxxxxxxxx) --- I'm pretty sure this is because IOMMU (for some Ryzens) unlatches after 5 tries on cold boot and 6 tries on warm. Suravee, alas, has set his patch at 5 x 20 msecs just on the 'dither' point! Some time mid-next week I'll lay my sticky hands on a 4700U laptop. I have images re-compiled for Ubuntu's kernel 5.8.0-45 (20.10) and 5.11.0-11 (21.04) patched at 25 x 20 msecs and logged. Ditto with Alex's oh-so-simple patch. If all goes well(!), I'll draw up a nice, comparative table of mine and everybody else's data so we can draw some conclusions. If you scan the Debian/Ubuntu kernel changelog, you'll find a long list of 'cherry-picked' patches for both AMD and Intel for IOMMU. It is very much a work-in-progress still! Best regards and many thanks all for input. David -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
