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Chord 2qute and my DOP challenge
Chord 2qute and my DOP challenge
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Old 20th October 2017, 10:19 AM   #151
michaelvv is offline michaelvv  Denmark
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Join Date: Jan 2014
This centos old guide (2011) does not work on a new ubuntu, to many things are changed. I have set some kernel boot parameters, found them yesterday, they some to help a little. Testing right now.
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Old 20th October 2017, 06:59 PM   #152
michaelvv is offline michaelvv  Denmark
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Join Date: Jan 2014
This kernel boot parameter gives we a greater stability.

cat /proc/cmdline

BOOT_IMAGE=/boot/vmlinuz-4.10.0-19-generic root=UUID=a6f56bb1-fe87-4738-a77d-dbed563fffc0 ro consoleblank=0 i8042.noaux i8042.nokbd i8042.noloop i8042.nomux i8042.nopnp hpet=force x2apic_phys clocksource=hpet

Will report after a couple of days, but something gets better :-)

Last edited by michaelvv; 20th October 2017 at 07:02 PM.
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Old 30th October 2017, 01:39 PM   #153
soundcheck is offline soundcheck  Germany
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Join Date: Mar 2005
Location: DUS
I'm running - since a couple of days - DSD128 as DOP and/or DSDnative fine on my PI3 with squeezelite under Arch.
Kernel is latest git.

I use an iFi DAC though.

Have you ever talked to the manufacturer?? The XMOS firmware(-performance)
might be a critical factor here.

Anyhow. Good luck. It's been a while you guys toying around with this.
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Old 3rd November 2017, 10:30 PM   #154
michaelvv is offline michaelvv  Denmark
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First I think the manufactor Chord really doesn't care. They have their Windows/MAC user which is fine for them.
If I wasn't so happy with it I'll just has bought another one. Again it only affects DSD, which I haven't got a lot of. Sadly it doesn't work stable on DSD.

I have a little tweak I'll try when I get it, and after that just enjoy the music, even if it doesn't solve this issue...
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Old 5th November 2017, 06:44 PM   #155
soundcheck is offline soundcheck  Germany
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Join Date: Mar 2005
Location: DUS
Hi.

Just write a mail to Chord. Tell em that the competition works fine.


Another idea. Not sure if that has been discussed earlier.

Have you tried to detach the DAC USB port from USB HID?
I once read about quirks that you can apply through cmdline.txt
Or you just compile a kernel without HID support.
You have to google the details.


Good luck.
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Old 5th November 2017, 07:36 PM   #156
michaelvv is offline michaelvv  Denmark
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Join Date: Jan 2014
Don't know how much in this thread you're read, but I actually have a 7 years old laptop which runs , 6-8 times more stable when performing DSD. Same kernel same software...

That is really what scares me, as it's also very hardware dependent, not only a Chord issue. It comes back to irqs pr seconds, this is the real issue, that we know for sure :-)
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Old 6th November 2017, 08:04 AM   #157
soundcheck is offline soundcheck  Germany
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Join Date: Mar 2005
Location: DUS
First of all.
That already rather poor shared USB/ethernet implementation on a PI is all but
optimal for a streamer with USB DAC attached. There'll be permanent two-way traffic on the same bus. That's one reason why I prefer I2S-HATs for PI.

Using the onboard Wifi might even be better than using the ethernet port.

Then you need to look at the power side. Many USB DACs feed their
input stage via USB to be able to offer galvanic isolation with just one power supply.
The PI power rails are not that stable either. Especially if shared with external devices.

Have you tried a powered HUB or one of these active USB filter gadgets?
I don't run my USB DACs without any of these USB filters/regenerators/reclockers.

Regarding "same software"

To have the same SW on both of your platforms is a false assumption. For sure there's different firmware, there are different drivers, asf. asf.
And then it's a complete different architecture.
E.g. On Intel IRQs are spread over all CPUs. On the PI they all pretty much run on CPU 0. And there are numerous more differences and things what
is done better by even a 10 year old Intel platform.

Bottom line. People who go for RPI should know about its widely known limitations.
And that's actually the fun part of the PI.
The real fun is to make things happen with that crappy $35 device.

And buying a DAC that comes with all but a mainstream USB stack implementation is another big risk - especially if you run Linux systems.
And then you're not even willing to write them a simple mail...
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Old 6th November 2017, 11:03 AM   #158
phofman is offline phofman  Czech Republic
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Join Date: Apr 2005
Location: Pilsen
soundcheck: Michael is facing the IRQ problems on this hw:

H110TM-ITX r2.0 Motherboard with an Intel i5-7600T

Chord 2qute and my DOP challenge

michaelvv: What drivers does that DAC use on Windows/OSX where it works as you report? The stock USB Audio class 2 drivers, or does the manufacturer provide its specific drivers for this gear?
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Old 27th November 2017, 03:04 PM   #159
elgringo81 is offline elgringo81
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Join Date: Nov 2017
Hello Michaelvv

I have now registered to this forum just to tell you that I have the same problem, also located in Denmark (But unrelated )

My 2Qute dropps during DSD playback on linux devices.

I have tried RP2b and Asus Tinker Board.
Both when I am running with DietPi/Roon Bridge and also the same through Rune and Volumio.

First I thought this problems was related to the ETH sharing the USB bus on Pi and Tinkerboard, so I bought SoTM SMS-200 and guess what!.. Same issue..

I really hope something good comes our way.
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