Raspi3 HifiBerry DAC+ - left right channel swaping/switching

[surfninja]

This is interesting. I have a Wolfson DAC and noticed this same behavior. I was surprised and didn't think the recording was the same as what I'm hearing. Kind of forgot about it until I saw this post.

I'll have to pay closer attention to this. Lately I haven't been in front of the system but off to the side where Left and Right channel separation is not very noticeable.

I'll have to sit and listen to some music instead of web radio / background. When I hear it again, I'll listen to the same tune in audacity and see if the music swaps channels.

[surfninja]

FYI: the bug report.

Thanks Tobi for the link. I've verified on my system 16-bit flac is affected. I've ripped a CD to 32-bit wav and don't seem the have the same problem. This is only by ear, not by a scope.

ironically, my system is RunOs 0.3-beta (build 20141029) on a RP 1B+ (I think).

rune.png (4.22 KiB) Viewed 2197 times

Selection_032.png (104.67 KiB) Viewed 2197 times

I'd be happy to update my version if others have a fix.

[ingohz]

Looks like progress in this issue and the problem has been addressed. New upstream dma code seems to resolve it: https://github.com/raspberrypi/linux/issues/1417

[Paul]

Hello

I have recently bought Rpi3 and Hifiberry digi + using runeaudio. I have the same issue with channels swapping at random. This thread says it is something to do with the Linux Kernal and that it will be fixed.

The question I have is who fixes this and how do we find out when it has been fixed - will Runeaudio let us know through this forum for example? Once fixed how do we update our RPi3 etc. I am very new to all of this and am not really sure how it all works.

Look forward to receiving any answers

Paul

[hondagx35]

Hi Paul,

see the link posted by ingohz.

The manufacturer (Hifiberry) also is involved in that process.
We are waiting for a official statement from him.

You will get informed here.

BTW: If someone with linux knowledge has time to compile and test a patched kernel would be great.

Frank

[Paul]

Hi Frank

Thanks for the information.

Paul

[sarucyel]

Hi

Are we still waiting on hifiberry to come back?

Thanks sarucyel

[robertzombie]

Apparently a fix has been identified: https://support.hifiberry.com/hc/en-us/ ... _207646769

Can someone please explain how to apply the kernel patch on Raspbian and Raspbian Lite to a rookie? The whole Pi 3 > Digi+ > Rune set-up is essentially useless with this channel swapping issue. Very frustrating!

[hondagx35]

Hi robertzombie,

Can someone please explain how to apply the kernel patch on Raspbian and Raspbian Lite to a rookie? The whole Pi 3 > Digi+ > Rune set-up is essentially useless with this channel swapping issue. Very frustrating!

Also from here a friendly welcome to you!

digi-rune-and-usb-drive-channel-swapping-t3570.html#p14454

Frank

[hondagx35]

Hi,

to fix the channel swapping please try:

- check if you have enough space on your sd card

Code: Select all

df -h

If not (10% or less) first resize your sd card.

- update the kernel and firmware

Code: Select all

pacman -Sy --force raspberrypi-firmware-bootloader linux-raspberrypi
sync


EDIT:
The packages have changed please use

Code: Select all

pacman -Sy --force raspberrypi-firmware raspberrypi-bootloader linux-raspberrypi
sync

- modify config.txt (add "dtparam=audio=on")

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......
#dtparam=i2c_arm=on
#dtparam=i2c_vc=on
#dtparam=i2s=on
#dtparam=spi=on
#dtparam=act_led_trigger=mmc
dtparam=audio=on

#dtparam=uart1=off
#dtoverlay=pi3-disable-bt-overlay
.......

- remove some files

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rm /usr/lib/modules-load.d/nfs-utils.conf
rm /etc/modules-load.d/raspberrypi.conf

- set kernel version and reboot

Code: Select all

redis-cli set kernel "Linux runeaudio 4.4.8-2-ARCH"
sync
reboot

Frank