Comment 3 for bug 1075405

unlike other dell laptop, the user manual did no mention support of surround 51

but alsa driver seem allow surround40

did pulseaudio allow you to select surround 4.0 ? since there is no "Surround Playback Volume" control

 0.037| 0.000) D: [pulseaudio] alsa-mixer.c: Looking at profile output:analog-surround-40
( 0.037| 0.000) D: [pulseaudio] alsa-mixer.c: Checking for playback on Analog Surround 4.0 (analog-surround-40)
( 0.037| 0.000) D: [pulseaudio] alsa-util.c: Trying surround40:2 with SND_PCM_NO_AUTO_FORMAT ...
( 0.038| 0.000) D: [pulseaudio] alsa-util.c: Managed to open surround40:2
( 0.038| 0.000) D: [pulseaudio] alsa-util.c: Maximum hw buffer size is 185 ms
( 0.060| 0.022) D: [pulseaudio] alsa-util.c: Set buffer size first (to 3528 samples), period size second (to 441 samples).
( 0.060| 0.000) D: [pulseaudio] alsa-mixer.c: Profile output:analog-surround-40 supported.
( 0.061| 0.000) I: [pulseaudio] (alsa-lib)control.c: Invalid CTL surround40:2
( 0.061| 0.000) I: [pulseaudio] alsa-util.c: Unable to attach to mixer surround40:2: No such file or directory
( 0.061| 0.000) I: [pulseaudio] alsa-util.c: Successfully attached to mixer 'hw:2'
( 0.061| 0.000) D: [pulseaudio] alsa-mixer.c: Removing path 'analog-output' as it is a subset of 'analog-output-speaker'.
( 0.061| 0.000) D: [pulseaudio] alsa-mixer.c: Available mixer paths (after tidying):
( 0.061| 0.000) D: [pulseaudio] alsa-mixer.c: Path Set 0xe16e20, direction=1
( 0.061| 0.000) D: [pulseaudio] alsa-mixer.c: Path analog-output-speaker (Speakers), direction=1, priority=100, probed=yes, supported=yes, has_mute=yes, has_volume=yes, has_dB=yes, min_volume=0, max_volume=64, min_dB=-100099, max_dB=0
( 0.061| 0.000) D: [pulseaudio] alsa-mixer.c: Element Master, direction=1, switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=0, required_absent=0, mask=0x7ffffffffffff, n_channels=1, override_map=yes
( 0.061| 0.000) D: [pulseaudio] alsa-mixer.c: Element Headphone, direction=1, switch=1, volume=3, volume_limit=-1, enumeration=0, required=0, required_any=0, required_absent=0, mask=0x6, n_channels=2, override_map=no
( 0.061| 0.000) D: [pulseaudio] alsa-mixer.c: Element Speaker, direction=1, switch=1, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=4, required_absent=0, mask=0x3600000000f66, n_channels=2, override_map=yes
( 0.061| 0.000) D: [pulseaudio] alsa-mixer.c: Element PCM, direction=1, switch=0, volume=1, volume_limit=-1, enumeration=0, required=0, required_any=0, required_absent=0, mask=0x3600000000f66, n_channels=2, override_map=yes
( 0.061| 0.000) D: [pulseaudio] alsa-mixer.c: Element IEC958, direction=1, switch=2, volume=0, volume_limit=-1, enumeration=0, required=0, required_any=0, required_absent=0, mask=0x0, n_channels=0, override_map=no
( 0.061| 0.000) D: [pulseaudio] alsa-mixer.c: Jack Headphone, alsa_name='Headphone Jack', detection unavailable
( 0.061| 0.000) D: [pulseaudio] alsa-mixer.c: Jack Front Headphone, alsa_name='Front Headphone Jack', detection unavailable

( 0.080| 0.000) D: [pulseaudio] alsa-mixer.c: Looking at profile output:analog-surround-51
( 0.080| 0.000) D: [pulseaudio] alsa-mixer.c: Checking for playback on Analog Surround 5.1 (analog-surround-51)
( 0.080| 0.000) D: [pulseaudio] alsa-util.c: Trying surround51:2 with SND_PCM_NO_AUTO_FORMAT ...
( 0.080| 0.000) D: [pulseaudio] alsa-util.c: Managed to open surround51:2
( 0.081| 0.000) D: [pulseaudio] alsa-util.c: snd_pcm_hw_params_set_channels(6) failed: Invalid argument