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raspberrypi / Raspberry-Pi-OS-64bit

Repository for containing issues on the 64 bit operating system (as distinct from the 32 bit one)
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no sound or distorted sound with Hifiberry (DAC2 Pro) #177

Open smutbert opened 3 years ago

smutbert commented 3 years ago

Raspbian Pi OS aarch64 works great for me, except one issue. I hope this is the right place to report it:

The Hifiberry DAC2 Pro is detected correctly and in Alsa everything looks right

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 [HiFiBerry DAC+ HiFi pcm512x-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

but there is either no sound, just noise or distorted sound (too low and slow, as if audio was played with a too high sample rate, but independent of the sample rate of the audio file or the mpd output).

This happens at least with aplay and mpd, Options in /boot/config.txt like

dtoverlay=hifiberry-dacplus,slave=no
force_eeprom_read=0

don't help.

I am running Raspbian Pi OS "buster":

$ uname -a
Linux wip 5.10.52-v8+ #1440 SMP PREEMPT Tue Jul 27 09:56:40 BST 2021 aarch64 GNU/Linu
popcornmix commented 3 years ago

It would be useful if you could confirm if this is an issue with RPiOS 64bit, or a general issue. Install 32bit RPiOS to a spare sdcard and check if it has the same issue. If it does then https://github.com/raspberrypi/linux/issues would be a better place for bug report.

smutbert commented 3 years ago

I switched to the 32bit version because it was not working with the 64bit variant:

$ uname -a
Linux wipp 5.10.52-v7+ #1440 SMP Tue Jul 27 09:54:13 BST 2021 armv7l GNU/Linux

The configuration is the same and it is running fine.

pelwell commented 3 years ago

Can you try with "arm_64bit=1" in config.txt on the 32-bit OS? That will help to locate the problem in the kernel or the userland code.

smutbert commented 3 years ago

So then the 5.10.52-v8+ kernel will get booted the next time, right?

(I would like to know first, because I need to build a initramfs for the kernel. My /-filesystem is btrfs. It is a headless audio player and if something goes wrong, I'd need to open the case and take out the sdcard, which is quite a hassle and I already had to do it too often, when I switched from 64 to 32 bit.)

smutbert commented 3 years ago

Ok, I tried it anyway and the problem seems to be in the userspace. Now kernel 5.10.52-v8+ is running and it is still working.