At Sun, 10 Feb 2013 02:16:14 +0100, David H?rdeman wrote: > > On Thu, Feb 07, 2013 at 11:00:13AM +0100, Daniel Vetter wrote: > >On Wed, Feb 06, 2013 at 10:35:33PM +0100, David H?rdeman wrote: > >> I'll break etiquette here and include the entire original message below > >> (and top-post!) since I'm sending this to intel-gfx as well. > >> > >> Since the previous mail I've tested a more recent kernel (3.8-rc6), > >> swapping HDMI cables and a firmware update on the receiver, none of it > >> helped. > >> > >> I've also noticed that: > >> > >> a) switching between 1080p30 and 1080p50 or 1080p60 is enough to make > >> the sound go away (higher frame rates) or work (1080p30). So, it has > >> nothing to do with interlacing. > >> > >> The only difference between the output of all the intel*dump tools when > >> running 1080p30 and 1080p60 is included below. It's interesting to note > >> that all the modes that don't work have fdi_lanes = 2 while the working > >> ones have fdi_lanes = 1 (port width in intel_reg_dumper-speak). > >> > >> I'm CC:ing the intel-gfx list as well as the ALSA list since I'm not su > >> sure where the problem lies anymore...suggestions? > > > >I'm far away from an hdmi/snd expert, but iirc the bandwidth to squeeze > >hdmi sound packets between the video frames is limited. And atm our code > >does not bother with checking for that at all (and updating the > >capabilities of the hdmi snd widget). But that's just an idea, I have no > >idea how much bandwidth there actually is. > > I should add that I've now installed Win7 on a separate HD. Windows has > no problems at all with audio over HDMI, no matter which resolution > and/or refresh rate, so I think cabling and other HW issues can be ruled > out. The problem is Linux-specific. > > And, as I mentioned before, the TV *is* willing to accept and decode the > audio signal, so it appears that the audio stream is there....but it's > probably incompatible in some minor way...and the receiver is being > picky. That's my guess. > > Anyway, how should I proceed? File a bug? In the kernel bugzilla or ALSA > bugtracker or somewhere else? FYI, ALSA bug tracker is down (and I hope it's no longer used), so put it in either freedesktop or kernel bugzilla. Takashi
