[alsa-devel] the monitors with working Displayport audio

[Takashi Iwai]

At Wed, 9 Nov 2011 15:20:53 +0800,
Wu Fengguang wrote:
> 
> Hi Takashi,
> 
> I enumerated all the DELL DisplayPort monitors in our lab and find
> only two of them being able to produce audible DisplayPort audio...

Thanks for testing!

> - DELL 2408WFP
> - DELL 2709W
> - DELL 3008WFP
>         no CEA extension found

Our monitor here is one of them (or relevant).
I tried force_audio option, and it didn't work either.

> - DELL U2410
>         ELD reports OK but cannot hear DP sound
> 
>         monitor_present         1
>         eld_valid               1
>         monitor_name            DELL U2410
>         connection_type         DisplayPort
>         eld_version             [0x2] CEA-861D or below
>         edid_version            [0x3] CEA-861-B, C or D
>         manufacture_id          0xac10
>         product_id              0xf017
>         port_id                 0x0
>         support_hdcp            0
>         support_ai              0
>         audio_sync_delay        0
>         speakers                [0x1] FL/FR
>         sad_count               1
>         sad0_coding_type        [0x1] LPCM
>         sad0_channels           2
>         sad0_rates              [0xe0] 32000 44100 48000
>         sad0_bits               [0xe0000] 16 20 24
> 
> - DELL U3011
>         ELD and DP sound both OK
> 
>         monitor_present         1
>         eld_valid               1
>         monitor_name            DELL U3011
>         connection_type         DisplayPort
>         eld_version             [0x2] CEA-861D or below
>         edid_version            [0x3] CEA-861-B, C or D
>         manufacture_id          0xac10
>         product_id              0x4065
>         port_id                 0x0
>         support_hdcp            0
>         support_ai              0
>         audio_sync_delay        0
>         speakers                [0xf] FL/FR LFE FC RL/RR
>         sad_count               1
>         sad0_coding_type        [0x1] LPCM
>         sad0_channels           6
>         sad0_rates              [0x1ee0] 32000 44100 48000 96000 176400 192000 384000
>         sad0_bits               [0xe0000] 16 20 24
> 
> - Eizo FlexScan EV2333W
>         ELD and DP sound both OK
> 
>         monitor_present         1
>         eld_valid               1
>         monitor_name            EV2333W
>         connection_type         DisplayPort
>         eld_version             [0x2] CEA-861D or below
>         edid_version            [0x3] CEA-861-B, C or D
>         manufacture_id          0xc315
>         product_id              0x2068
>         port_id                 0x0
>         support_hdcp            0
>         support_ai              1
>         audio_sync_delay        0
>         speakers                [0x1] FL/FR
>         sad_count               1
>         sad0_coding_type        [0x1] LPCM
>         sad0_channels           2
>         sad0_rates              [0x1ee0] 32000 44100 48000 96000 176400 192000 384000
>         sad0_bits               [0xe0000] 16 20 24

Do you have idea why they don't work?

BTW, can DP-audio work with these monitors on other OS...?


thanks,

Takashi