|Summary:||HDMI no sound output while intel IOMMU is enabled on Haswell-based board|
|Severity:||normal||CC:||henrywu, intel-gfx-bugs, st.smartie, tiwai|
|Kernel Version:||3.16.x 3.15.x 3.12.x||Tree:||Fedora|
full dmesg log
ACPI table DMAR
log of lspci
Description st.smartie 2014-10-14 08:12:58 UTC
Created attachment 153671 [details] alsa info There are no sound output from HDMI when intel IOMMU is enabled. assign intel_iommu=on,igfx_off is not a way for me since I am developing IGD virtualization. I've discovered some symptoms: the execution of aplay -D plughw:0,7 /usr/share/sounds/alsa/Front_Center.wav aplay -D plughw:0,3 /usr/share/sounds/alsa/Front_Center.wav is never end unless you interrupt it. Actually it is not no sound output at all, you could hear few frames played from speaker, but the duration is very short (less then 0.1 second.) Some logs are attached for your reference.
Comment 5 Takashi Iwai 2014-10-15 12:37:51 UTC
The problem is rather in iommu or graphics, not in the sound driver... Let's reassign to the component. Feel free to reassign to else if not appropriate.
Comment 6 henrywu 2014-10-16 04:47:39 UTC
(In reply to Takashi Iwai from comment #5) > The problem is rather in iommu or graphics, not in the sound driver... > Let's reassign to the component. Feel free to reassign to else if not > appropriate. Thanks. I am wondering if the IGD and HDA controller share a p2p bridge? that intel iommu is not aware of? Just a wild guess, correct me if I am wrong.