Raspi3 HifiBerry DAC+ - left right channel swaping/switching

jones

Hello,

i expierience a strange problem with my runaudio setup.

RasPi3
Hifiberry DAC+
7" original RasPi Display
runeaudio Version: RuneAudio_rpi2_rp3_0.4-beta_20160321_2GB

So my problem is:
sometimes in a song the sound from the speakers is changing so that the left channel is on the right speaker and the other way around.

its only happening occasionally and not reproduceable. sometimes it is switching left to right and right to left and back in a few seconds.

really strange... first i thougt its on the recordings ad listened to the recordings over and over. then i listened to songs where there is a strong left to right difference (instruments).

Im now testing if this is related to "sound signatures". Are the sounds ignatures working on the RasPi3 ?

hondagx35

Hi jones,

you are not the only user with this issue.
#3293

My problem is that i'm unable to reproduce this.
I will do a few more test.

Frank

jones

Hi Frank,

thanks for your reply.

Jones

hondagx35

Hi jones,,

with my setup (Rp3, 7" TFT, Hifiberry DAC+, Wifi) i have absolutely zero channel swapping.
Is your DAC the standard or the pro version?

Frank

jones

Hi Frank,

its the standard version.

jones

fboe

Hi Frank

I have the same problem with my rpi3 with hifiberry digi+, Not often but sometimes, and it is a smooth swift, not any click or pause in the music.

All best

Anders

hondagx35

Hi,

i'm working on this.
First i have to find a way to reproduce this.

Frank

jones

Hi Frank,

i'm from Germany, too. If you like i can send you my RasPi etc.

Jones

tobvc

Hi,

there is news on that matter from Hifiberry. They identified it to be some kind of kernel related problem.

Tobi

FYI: the bug report.

hondagx35

Hi tobvc,

tank you for reporting this.

I'll submit a bug report to the Linux RPi kernel development forum and hopefully we'll get this issue resolved.

All the best,

Stuart

Please keep an eye on this and report here.

Frank

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

tobvc wroteFYI: 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 3176 times

: Selection_032.png (104.67 KiB) Viewed 3176 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/community/posts/207256895-Fix-for-DAC-Pro-on-RPi3-disable-bluetooth?page=1#community_comment_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!

#35702

Frank

hondagx35

Hi,

to fix the channel swapping please try:

- check if you have enough space on your sd card

df -h

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

- update the kernel and firmware

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

EDIT:
The packages have changed please use

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

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

......
#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

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

- set kernel version and reboot

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

Frank