[Bug 75537] [hsw] Hdmi audio is buggy

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75537

tmacalp <tmacalp at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |tmacalp at gmail.com

--- Comment #14 from tmacalp <tmacalp at gmail.com> ---
We have two almost identical Lenovo laptops.  The T540p works properly with
displayport/hdmi audio out.  The L540 has major problems with the
displayport/hdmi audio out.  The sound does play through hdmi, but comes out
about 25% faster and much higher pitched than normal.  Playback through the
built-in speakers/headphone jack is normal speed/pitch. 

lspci on the T540p shows
00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High
Definition Audio Controller (Rev 4)

and the L540 shows
00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High
Definition Audio Controller (Rev 5)

As you can see, the only difference is the revision number.  Both systems are
running up-to-date Fedora 20, using kernel 3.13.9-200.fc20.x86_64.

Also, I'm getting errors in dmesg on the L540.  I get 10 of these:
ALSA sound/pci/hda/hda_eld.c:260 HDMI: Unknown ELD version 0

And dmesg ends with these messages:
hda-intel: IRQ timing workaround is activated for card #1. Suggest a bigger
bdl_pos_adj.

ALSA sound/pci/hda/hda_intel.c:2458 0000:00:1b.0: Unstable LPIB (352800 >=
176400); disabling LPIB delay counting

If requested, I will attach the full listings from both laptops.  Because the
external audio is unusable on machines that use Rev 5, I'd argue that the
importance should be elevated higher than "medium normal."

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