Async USB Dac Experiments - testers wanted...

[tufty]

Did you turn the dac off overnight too? It definately won't support this...

I was wondering about this: is it currently necessary to reset the Touch if the DAC is turned off and then on later? Has seemed that way to me. Is this something that can be "fixed"?

[Triode]

I was wondering about this: is it currently necessary to reset the Touch if the DAC is turned off and then on later? Has seemed that way to me. Is this something that can be "fixed"?

Yes this is the case.

It can only be "fixed" with changes to the core logitech code, which if I do and distribute it means that you loose features from the firmware which are not open source. At present squeezeplay (the player application run on touch) only opens the audio device at startup and assumes that it only starts up at reboot of the box. It may be possible to reboot just the app, but a better approach would be to be able to open the audio device when a new dac is detected. This is not possible at present.

[MWelschenbach]

Did you turn the dac off overnight too? It definately won't support this...

Yes, the dac is off for the night.

One other observation: I tried the plugin with the default kernel 7.7.1 from Logitech, neither kernel #1 nor kernel #2 installed, and it seems to work perfectly with my dac even with 24/96 material. Is this as it is supposed to be?

[Triode]

Yes, the dac is off for the night.

One other observation: I tried the plugin with the default kernel 7.7.1 from Logitech, neither kernel #1 nor kernel #2 installed, and it seems to work perfectly with my dac even with 24/96 material. Is this as it is supposed to be?

Very likely - kernel #2 is very similar to the default kernel, the only signficant difference is that some dacs will need kernel #2 as they ask for more bandwidth on the usb bus than the default kernel offers. (In the case of the MDAC for instance it requires this)

The main thing with kernel #2 and the default kernel is the need for an external hub to may async work as the silicon inside touch appears to have a limitation which the hub fixes.

[I would like to get the 2 changes in kernel #2 into the standard firmware, but am awaiting feedback from logitech]

[MWelschenbach]

Very likely - kernel #2 is very similar to the default kernel, the only signficant difference is that some dacs will need kernel #2 as they ask for more bandwidth on the usb bus than the default kernel offers. (In the case of the MDAC for instance it requires this)

The main thing with kernel #2 and the default kernel is the need for an external hub to may async work as the silicon inside touch appears to have a limitation which the hub fixes.

[I would like to get the 2 changes in kernel #2 into the standard firmware, but am awaiting feedback from logitech]

I use the Hama USB hub that you referred to earlier. It would be great if Logitech would accept your changes for the standard firmware.

Thanks again for your effort.

[MWelschenbach]

Has anyone here tried kernel #1 or #2 with the antelope zodiac?

[Triode]

I've added another test kernel and would like to see feedback from people using a range of dacs with kernel #3.

This is differnet from previous kernels which aimed to include minimal patches to the original linux kernel used in touch. Kernel #3 includes the majority of patches added to the usbaudio driver to bring it up to date with the linux kernel tree as of April 2011. (This changes are resticted to sound/usb)

This means the driver includes new code to parse the requirements of the dac and also _possibly_ provides support of USB Audio Class 2. [I have no idea as I can't test, but I've included what looked to be the relavent patches]

As with kernel #2, if you have an async usb 1 device then you will need an external hub.

Very interested in test results.

[MWelschenbach]

I've added another test kernel and would like to see feedback from people using a range of dacs with kernel #3.

This is differnet from previous kernels which aimed to include minimal patches to the original linux kernel used in touch. Kernel #3 includes the majority of patches added to the usbaudio driver to bring it up to date with the linux kernel tree as of April 2011. (This changes are resticted to sound/usb)

This means the driver includes new code to parse the requirements of the dac and also _possibly_ provides support of USB Audio Class 2. [I have no idea as I can't test, but I've included what looked to be the relavent patches]

As with kernel #2, if you have an async usb 1 device then you will need an external hub.

Very interested in test results.

Is it possible to install the new kernel over kernel #2?

[Triode]

Is it possible to install the new kernel over kernel #2?

Yes - just go to the Kernel Updater menu and select the new one.

[MWelschenbach]

Yes - just go to the Kernel Updater menu and select the new one.

The new kernel #3 seems to work flawlessly with 8200CDQ and hub up to 24/96.