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Lenovo removed the extra mixer since the T61 and thereabouts. Newer Lenovo models only have the mute gate function, and leave the volume control to the HDA mixer. Until a way to automatically query the firmware about its audio control capabilities is discovered (there might not be any), use a white/black list. We will likely need to ask T60 (old and new model) and Z60/Z61 users whether they have volume control to populate the black/white list. Meanwhile, provide a volume_capabilities parameter that can be used to override the defaults. Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Cc: Lorne Applebaum <lorne.applebaum@gmail.com> Cc: Matthew Garrett <mjg@redhat.com> Signed-off-by: Len Brown <len.brown@intel.com>