Created attachment 289285 DMAR table of Haswell macbookpro11,1 [8086:0a2e] I have been able to reproduce this bug on a Haswell system, specifically a 2013 Retina MacBookPro (macbookpro11,1) with an integrated Intel graphics card, with a single HDMI out.
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a2e] (rev 09) 00:03.0 Audio device [0403]: Intel Corporation Haswell-ULT HD Audio Controller [8086:0a0c] (rev 09) (I'm attaching the full lspci -nn) I can reliably reproduce the symptoms of lagging audio and eventual complete failure of HDMI audio. I can work-around this issue by disabling IOMMU either completely or just for the integrated graphics. I haven't test the kernel patch, but I can do it if you believe it is still relevant to try and fix this upstream. I hope I can help with this, thank you very much for your work! I'm attaching the DMAR table of my system, as well as my boot/kernel log for IOMMU-off and IOMMU-on -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1428121 Title: Intel HDMI Audio not working with IOMMU enabled To manage notifications about this bug go to: https://bugs.launchpad.net/alsa-driver/+bug/1428121/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
