!!Module: thinkpad_acpi
        brightness_enable : 2
        brightness_mode : 4
        dbg_bluetoothemul : 0
        dbg_uwbemul : 0
        dbg_wlswemul : 0
        dbg_wwanemul : 0
        enable : Y
        experimental : 0
        fan_control : N
        force_load : N
        id : ThinkPadEC
        index : -536870912
        software_mute : Y
        volume_capabilities : 0
        volume_control : N
        volume_mode : 3


this mean bug in
volume_set_software_mute() since software_mute=Y and still have ec console

you have to file upstream ThinkPad acpi bug report

Soundcards recognised by ALSA
!!-----------------------------

 0 [Intel          ]: HDA-Intel - HDA Intel
                      HDA Intel at 0xee240000 irq 31
29 [ThinkPadEC     ]: ThinkPad EC - ThinkPad Console Audio Control
                      ThinkPad Console Audio Control at EC reg 0x30, fw 
7BHT40WW-1.13

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https://bugs.launchpad.net/bugs/1450947

Title:
  [ThinkPad X60 - HDA Intel AD1981, playback] Volume Mute, Up, Down keys
  have no effect

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