https://chromium-review.googlesource.com/#/c/chromiumos/platform/chameleon/+/1092617 posted

The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/platform/chameleon/+/0d6e32de70e44e7a0e492b7bdc73c6822b5cd071

commit 0d6e32de70e44e7a0e492b7bdc73c6822b5cd071
Author: Cheng-Yi Chiang <cychiang@chromium.org>
Date: Fri Jun 08 17:38:13 2018

usb_printer_device: Unplug printer in Reset

If client does not Unplug printer in the end, printer will remain
plugged. It will block g_audio usage.

BUG=chromium:850874
TEST=Call Reset and see g_printer is removed.

Change-Id: I97802f3ef2b34c728b7e192bbb8a171b7b3c81f9
Reviewed-on: https://chromium-review.googlesource.com/1092617
Commit-Ready: Cheng-Yi Chiang <cychiang@chromium.org>
Tested-by: Cheng-Yi Chiang <cychiang@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@google.com>

[modify] https://crrev.com/0d6e32de70e44e7a0e492b7bdc73c6822b5cd071/chameleond/devices/usb_printer_device.py

I have uploaded the bundle to r231, and verified that it can fix the issue.
However, I could not update to all chameleon in the lab because ahost got connection timeout.

(cr) ((9d43e566f...)) cychiang@cychiang-z840 ~/trunk/src/third_party/autotest/files $ ~/trunk/src/third_party/autotest/files/cli/atest host list -b 'chameleon'

Invalid server name http://cautotest: <urlopen error [Errno 110] Connection timed out>

usage: atest host list [options] <hosts>

On the other hand, host list tab on cautotest frontend works fine.
http://cautotest/afe/#tab_id=hosts

There are 94 boards with label chameleon.

The Unplug fix version 0.0.2-r231 was failing some HDMI tests - issue 852502, and chameleon build was reverted to 0.0.2-r230.

I do not see USB audio issues after going back to v230 -https://screenshot.googleplex.com/yyOhJ06CY0w
Only auron_paine is failing with "Target input type USB not present". Is this the originating issue here?

Also I see printing e2e test is running - https://screenshot.googleplex.com/cVbHWVkqDeU

Hi Kalin,

Several DUTs still stuck in the state (with usb printer plugged in).

Please check from the following links:

For nightly:
https://stainless.corp.google.com/search?view=matrix&row=board_model&col=build&first_date=2018-06-13&last_date=2018-06-26&suite=%5Echameleon%5C_audio%5C_nightly%24&test=%5Eaudio%5C_AudioBasicUSB.*%24&exclude_cts=true&exclude_not_run=false&exclude_non_release=false&exclude_au=true&exclude_acts=true&exclude_retried=true&exclude_non_production=false

For perbuild:
https://stainless.corp.google.com/search?view=matrix&row=board_model&col=build&first_date=2018-06-13&last_date=2018-06-26&suite=%5Echameleon%5C_audio%5C_perbuild%24&test=%5Eaudio%5C_AudioBasicUSB.*%24&exclude_cts=true&exclude_not_run=false&exclude_non_release=false&exclude_au=true&exclude_acts=true&exclude_retried=true&exclude_non_production=false

Could you check those and reset the state?
Thanks!

I used command "modprobe -r g_printer" in chameleon to unplug USB printer from DUTs manually for those failures listed above.
Let's wait for a whlie to see the results.

The NextAction date has arrived: 2018-07-02