linux-kernel - Re: ALSA: Conexant CX20585 (thinkpad t510) speaker powersave regression

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Date:	Thu, 11 Jul 2013 23:42:27 -0500
From:	Jason Schindler <jschind@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: ALSA: Conexant CX20585 (thinkpad t510) speaker powersave regression

I'm attempting to jump into the thread from here:

http://markmail.org/message/zqbhcuc2gnxji3s7

I'm experiencing the same issue as described in the thread.  I'm
currently running kernel 3.9.6, but have had the issue for some time.

I attempted to go through the debugging requested by Takashi Iwai on Jan 13.

Immediately after issuing the "hda-verb /dev/snd/hwC0D0 0x1f
SET_POWER_STATE 0" command, here is the trace output:

# tracer: nop
#
# entries-in-buffer/entries-written: 8/8   #P:4
#
#                              _-----=> irqs-off
#                             / _----=> need-resched
#                            | / _---=> hardirq/softirq
#                            || / _--=> preempt-depth
#                            ||| /     delay
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#              | |       |   ||||       |         |
        hda-verb-14066 [001] .... 90509.001737: hda_power_count: [0:0]
power_count=2, power_on=1, power_transition=0
        hda-verb-14066 [001] .... 90509.001740: hda_send_cmd: [0:0] val=1f70500
        hda-verb-14066 [001] .... 90509.001814: hda_get_response: [0:0] val=0
        hda-verb-14066 [001] .... 90509.001814: hda_power_count: [0:0]
power_count=1, power_on=1, power_transition=0
        hda-verb-14122 [003] .... 90712.799801: hda_power_count: [0:0]
power_count=2, power_on=1, power_transition=0
        hda-verb-14122 [003] .... 90712.799804: hda_send_cmd: [0:0] val=1f70500
        hda-verb-14122 [003] .... 90712.799880: hda_get_response: [0:0] val=0
        hda-verb-14122 [003] .... 90712.799881: hda_power_count: [0:0]
power_count=1, power_on=1, power_transition=0

When the speakers stop, here is the output:

# tracer: nop
#
# entries-in-buffer/entries-
written: 8/8   #P:4
#
#                              _-----=> irqs-off
#                             / _----=> need-resched
#                            | / _---=> hardirq/softirq
#                            || / _--=> preempt-depth
#                            ||| /     delay
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#              | |       |   ||||       |         |
        hda-verb-14066 [001] .... 90509.001737: hda_power_count: [0:0]
power_count=2, power_on=1, power_transition=0
        hda-verb-14066 [001] .... 90509.001740: hda_send_cmd: [0:0] val=1f70500
        hda-verb-14066 [001] .... 90509.001814: hda_get_response: [0:0] val=0
        hda-verb-14066 [001] .... 90509.001814: hda_power_count: [0:0]
power_count=1, power_on=1, power_transition=0
        hda-verb-14122 [003] .... 90712.799801: hda_power_count: [0:0]
power_count=2, power_on=1, power_transition=0
        hda-verb-14122 [003] .... 90712.799804: hda_send_cmd: [0:0] val=1f70500
        hda-verb-14122 [003] .... 90712.799880: hda_get_response: [0:0] val=0
        hda-verb-14122 [003] .... 90712.799881: hda_power_count: [0:0]
power_count=1, power_on=1, power_transition=0

I'm a bit out of my element here, if I've missed a crucial step,
please let me know.

Thanks!

-Jason
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