@kalin added sound to BVT in https://chromium-review.googlesource.com/#/c/357851/

Rialto does not have any sound drivers so should not be running this test?

Rialto doesn't do audio at all.  That test should be skipped.

Right, so I have https://chromium-review.googlesource.com/#/c/406468/ 

Another way is to remove bvt label from these DUTs - https://screenshot.googleplex.com/T0aq6mPxTLP , but it seems running bvt for rialto is done in purpose.

Any other way?

is change 406468 sufficient?

Yes, it isolates boards like rialto, and either 
1) exits the tests by causing PASS
or
2) errors out if audio control is observed.

The rest of the logic stays same, just modified the way to feed the playback and record devices availability through boards names in list.

great. Thanks!

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/1525094fe100c40f8497a4e31ae067a2d66ac825

commit 1525094fe100c40f8497a4e31ae067a2d66ac825
Author: Kalin Stoyanov <kalin@chromium.org>
Date: Tue Nov 01 23:30:19 2016

Exclude boards with no audio device

BUG= chromium:660094 
TEST=Ran test for diff boards

Change-Id: I25c816c4e3c7e26b8988d919b91429be856c2553
Reviewed-on: https://chromium-review.googlesource.com/406468
Commit-Ready: Kalin Stoyanov <kalin@chromium.org>
Tested-by: Kalin Stoyanov <kalin@chromium.org>
Reviewed-by: Kalin Stoyanov <kalin@chromium.org>

[modify] https://crrev.com/1525094fe100c40f8497a4e31ae067a2d66ac825/client/tests/sound_infrastructure/sound_infrastructure.py

Your change meets the bar and is auto-approved for M55 (branch: 2883)

Passed for M56-8872.46.0 - https://sponge.corp.google.com/invocations?searchFor=bvt-cq%20veyron_rialto%20user%3Achromeos-test%20Sound%20System%20Validation

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/third_party/autotest/+/6e482629a54ea5e70b44010a21c15cc40cbff1d4

commit 6e482629a54ea5e70b44010a21c15cc40cbff1d4
Author: Kalin Stoyanov <kalin@chromium.org>
Date: Tue Nov 01 23:30:19 2016

Exclude boards with no audio device

BUG= chromium:660094 
TEST=Ran test for diff boards

Change-Id: I25c816c4e3c7e26b8988d919b91429be856c2553
Reviewed-on: https://chromium-review.googlesource.com/406468
Commit-Ready: Kalin Stoyanov <kalin@chromium.org>
Tested-by: Kalin Stoyanov <kalin@chromium.org>
Reviewed-by: Kalin Stoyanov <kalin@chromium.org>
(cherry picked from commit 1525094fe100c40f8497a4e31ae067a2d66ac825)
Reviewed-on: https://chromium-review.googlesource.com/410142
Commit-Queue: Kalin Stoyanov <kalin@chromium.org>

[modify] https://crrev.com/6e482629a54ea5e70b44010a21c15cc40cbff1d4/client/tests/sound_infrastructure/sound_infrastructure.py

Should I merge to M-54?

Only if you want to.  I think we can ignore the M54 failures for the next few weeks.

Sounds good, will skip 54. It passes for m55 too.