as you are not using 48000Hz 6 channels
it depend on your HDA controller don't has 128 bytes alignment in period bytes restriction
( 2.009| 0.000) I: [pulseaudio] sink.c: device.vendor.id = "8086" ( 2.009| 0.000) I: [pulseaudio] sink.c: device.vendor.name = "Intel Corporation" ( 2.009| 0.000) I: [pulseaudio] sink.c: device.product.id = "8d20" ( 2.009| 0.000) I: [pulseaudio] sink.c: device.product.name = "Wellsburg HD Audio Controller" ( 2.009| 0.000) I: [pulseaudio] sink.c: device.form_factor = "internal" ( 2.009| 0.000) I: [pulseaudio] sink.c: device.string = "surround51:0" ( 2.009| 0.000) I: [pulseaudio] sink.c: device.buffering.buffer_size = "65520" ( 2.009| 0.000) I: [pulseaudio] sink.c: device.buffering.fragment_size = "32760" ( 2.009| 0.000) I: [pulseaudio] sink.c: device.access_mode = "mmap+timer" ( 2.009| 0.000) I: [pulseaudio] sink.c: device.profile.name = "analog-surround-51" ( 2.009| 0.000) I: [pulseaudio] sink.c: device.profile.description = "Analog Surround 5.1"
as you are not using 48000Hz 6 channels
it depend on your HDA controller don't has 128 bytes alignment in period bytes restriction
( 2.009| 0.000) I: [pulseaudio] sink.c: device.vendor.id = "8086" buffering. buffer_ size = "65520" buffering. fragment_ size = "32760" surround- 51" profile. description = "Analog Surround 5.1"
( 2.009| 0.000) I: [pulseaudio] sink.c: device.vendor.name = "Intel Corporation"
( 2.009| 0.000) I: [pulseaudio] sink.c: device.product.id = "8d20"
( 2.009| 0.000) I: [pulseaudio] sink.c: device.product.name = "Wellsburg HD Audio Controller"
( 2.009| 0.000) I: [pulseaudio] sink.c: device.form_factor = "internal"
( 2.009| 0.000) I: [pulseaudio] sink.c: device.string = "surround51:0"
( 2.009| 0.000) I: [pulseaudio] sink.c: device.
( 2.009| 0.000) I: [pulseaudio] sink.c: device.
( 2.009| 0.000) I: [pulseaudio] sink.c: device.access_mode = "mmap+timer"
( 2.009| 0.000) I: [pulseaudio] sink.c: device.profile.name = "analog-
( 2.009| 0.000) I: [pulseaudio] sink.c: device.