Node 0x21 [Volume Knob Widget] wcaps 0x600080: Mono
  Volume-Knob: delta=0, steps=32, direct=0, val=64
  Unsolicited: tag=00, enabled=0
  Connection: 0


volume knob seem not enabled

do you mean thr driver enable volume knob in previous version ?


https://bugzilla.kernel.org/enter_bug.cgi?product=Drivers


you need to file upstream bug report if it is a regression

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https://bugs.launchpad.net/bugs/1511148

Title:
  no sound at all on toshiba portege r500-12p

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