[tom@localhost ~]$ sudo hda-verb /dev/snd/hwC1D0 0x0 PARAMETERS 0x00
nid = 0x0, verb = 0xf00, param = 0x0
value = 0x10ec0295

16810@1497382654.110606:vfio_region_read  (0000:00:1f.3:region0+0x48, 2) = 0x93
16810@1497382654.110749:vfio_region_read  (0000:00:1f.3:region0+0x4a, 2) = 0x93
16810@1497382654.110788:vfio_region_write  (0000:00:1f.3:region0+0x48, 0x94, 2)
16810@1497382654.110848:vfio_region_read  (0000:00:1f.3:region0+0x24, 4) = 0xc0000000
16810@1497382654.110868:vfio_region_read  (0000:00:1f.3:region0+0x5d, 1) = 0x1
16810@1497382654.110882:vfio_region_read  (0000:00:1f.3:region0+0x58, 2) = 0x94
16810@1497382654.110896:vfio_region_write  (0000:00:1f.3:region0+0x5d, 0x5, 1)
16810@1497382654.110909:vfio_region_read  (0000:00:1f.3:region0+0x24, 4) = 0x0



[tom@localhost ~]$ sudo hda-verb /dev/snd/hwC1D0 0x0 PARAMETERS 0x02
nid = 0x0, verb = 0xf00, param = 0x2
value = 0x100002


16810@1497382986.999706:vfio_region_read  (0000:00:1f.3:region0+0x48, 2) = 0x94
16810@1497382986.999820:vfio_region_read  (0000:00:1f.3:region0+0x4a, 2) = 0x94
16810@1497382986.999851:vfio_region_write  (0000:00:1f.3:region0+0x48, 0x95, 2)
16810@1497382986.999911:vfio_region_read  (0000:00:1f.3:region0+0x24, 4) = 0xc0000000
16810@1497382986.999943:vfio_region_read  (0000:00:1f.3:region0+0x5d, 1) = 0x1
16810@1497382986.999969:vfio_region_read  (0000:00:1f.3:region0+0x58, 2) = 0x95
16810@1497382986.999994:vfio_region_write  (0000:00:1f.3:region0+0x5d, 0x5, 1)
16810@1497382987.000019:vfio_region_read  (0000:00:1f.3:region0+0x24, 4) = 0x0