Re: [Alsa-user] Can not capture 24-bit audio with EMI 6|2 & ALSA 1.0.11
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Re: [Alsa-user] Can not capture 24-bit audio with EMI 6|2 & ALSA 1.0.11
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From: geerten <ge...@ba...> - 2006-11-02 20:48:55
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<html> <body> <font size=3>At 20:18 02/11/2006, Jorma R wrote:<br> <blockquote type=cite class=cite cite>Hello!<br><br> I am having a strange problem with Emagic EMI 6|2 USB sound card and ALSA<br> 1.0.11. The setup I am running is a Fedora Core 5 with kernel, alsa and jack<br> from Planet CCRMA. The strange thing is that the very same hardware has been<br> working perfectly earlier with FC3 (do not remember exact ALSA revision) and<br> even on Red Hat 9 on a 2.4 series kernel! The kernel I am running is a 2.6.16-1<br> with realtime pre-empt enabled.<br><br> This is what happens:<br><br> I start Jack forcing it to use 16-bit samples -everything is fine.<br> I start Jack with playback only with 24-bit samples -everything is fine again.<br><br> I try to start Jack in Duplex mode with 24-bit samples and I get this output<br> from jack:<br> <br> </font></blockquote><br> ....<br><br> <blockquote type=cite class=cite cite><font size=3>When this happens this pops into the system log in /var/log/messages:<br><br> Nov 2 21:13:48 Computer kernel: ALSA<br> /usr/src/rpm/BUILD/alsa-driver-1.0.11/usb/usbaudio.c:864: cannot submit datapipe<br> for urb 0, error -28: not enough bandwidth<br> Nov 2 21:13:53 Computer kernel: ohci_hcd 0000:00:03.0: leak ed f59371c0 (#8c)<br> state 2<br><br> This makes me think that something is wrong with ALSA - not jack or the kernel.<br> Or could this be just a configuration error?<br><br> I tried to dig everything I could find on this from ALSA wiki and mailing lists<br> and tried every trick I found - loading the kernel module with different nrpacks<br> settings, etc. but with no luck.<br><br> Pointers on what to do next would be highly appreaciated!<br><br> Thanks,<br><br> Jorma</font></blockquote><br> There's a note in the manual: Due to USB bandwith limitations, the A62 can only use 24-bit resolution in one direction at a time - i.e. either for playback or recording.<br> This is in the Windows section, but USB bandwith is the same for Linux, so I guess the same limitation applies..<br><br> Groeten,<br> Geerten.<br><br> <br><br> </body> </html> |