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Sound is bad on USB sound card after recent upgrade

Posted: Tue Apr 29, 2014 8:26 pm
by ski522
I've been using a PCM2704 card for several years with great success. Well after doing a "rpi-update" my sound is awful, sounds like a badly received FM radio station. How do I go back to my prior update? Looking at dmesg and syslog provide no clues as to the problem.

Anyone else using the PCM2704 finding problems with the recent update?

Re: Sound is bad on USB sound card after recent upgrade

Posted: Tue Apr 29, 2014 8:37 pm
by GTR2Fan
ski522 wrote:Anyone else using the PCM2704 finding problems with the recent update?
No. But I'm having what sounds like the same symptoms (like a badly distorted mis-tuned FM radio) with a USB sound dongle based on the CM119 sound chip. I've only just received mine today, but it was recommended by someone of this forum as working. It would be nice to get to the bottom of it as it works perfectly plugged into my PC's USB ports.

Re: Sound is bad on USB sound card after recent upgrade

Posted: Tue Apr 29, 2014 8:38 pm
by DougieLawson
Have you tried the 3.12.18+ kernel which includes the re-written USB driver?

Re: Sound is bad on USB sound card after recent upgrade

Posted: Tue Apr 29, 2014 9:01 pm
by ski522
Yeah, the upgrade did that as shown in dmesg
Linux version 3.12.18+ ([email protected]) (gcc version 4.7.2 20120731 (prerelease) (crosstool-NG linaro-1.13.1+bzr2458 - Linaro GCC 2012.08) ) #677 PREEMPT Mon Apr 28 22:45:00 BST 2014
I added the "dwc_otg.speed=1" in the /boot/cmdline.txt to lower the USB ports speed and now the sound is find...something screwy with running USB at full speed which I used to do with prior versions, so there's a new bug somewhere.

Re: Sound is bad on USB sound card after recent upgrade

Posted: Tue Apr 29, 2014 9:04 pm
by ski522
GTR2Fan wrote:
ski522 wrote:Anyone else using the PCM2704 finding problems with the recent update?
No. But I'm having what sounds like the same symptoms (like a badly distorted mis-tuned FM radio) with a USB sound dongle based on the CM119 sound chip. I've only just received mine today, but it was recommended by someone of this forum as working. It would be nice to get to the bottom of it as it works perfectly plugged into my PC's USB ports.
See my post above to fix it temporarily, lowers the USB ports speed to 12MBps. Basically "sudo nano /boot/cmdline.txt"

My file looks like:

Code: Select all

dwc_otg.speed=1 dwc_otg.lpm_enable=0 console=ttyAMA0,115200 kgdboc=ttyAMA0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline rootwait

Re: Sound is bad on USB sound card after recent upgrade

Posted: Tue Apr 29, 2014 9:07 pm
by DougieLawson
ski522 wrote:Yeah, the upgrade did that as shown in dmesg
Linux version 3.12.18+ ([email protected]) (gcc version 4.7.2 20120731 (prerelease) (crosstool-NG linaro-1.13.1+bzr2458 - Linaro GCC 2012.08) ) #677 PREEMPT Mon Apr 28 22:45:00 BST 2014
I added the "dwc_otg.speed=1" in the /boot/cmdline.txt to lower the USB ports speed and now the sound is find...something screwy with running USB at full speed which I used to do with prior versions, so there's a new bug somewhere.
You'll need to post an issue on Git as jdb requested here: http://www.raspberrypi.org/forums/viewt ... 01#p543101

Re: Sound is bad on USB sound card after recent upgrade

Posted: Tue Apr 29, 2014 9:09 pm
by GTR2Fan
Thank you. I'll try that tomorrow. Does that also clobber data transfer speeds? My OSes run from an HDD in a USB caddy and I'd rather sacrifice USB sound support than suffer a massive data transfer slowdown.

Re: Sound is bad on USB sound card after recent upgrade

Posted: Tue Apr 29, 2014 9:12 pm
by ski522
DougieLawson wrote:
ski522 wrote:Yeah, the upgrade did that as shown in dmesg
Linux version 3.12.18+ ([email protected]) (gcc version 4.7.2 20120731 (prerelease) (crosstool-NG linaro-1.13.1+bzr2458 - Linaro GCC 2012.08) ) #677 PREEMPT Mon Apr 28 22:45:00 BST 2014
I added the "dwc_otg.speed=1" in the /boot/cmdline.txt to lower the USB ports speed and now the sound is find...something screwy with running USB at full speed which I used to do with prior versions, so there's a new bug somewhere.
You'll need to post an issue on Git as jdb requested here: http://www.raspberrypi.org/forums/viewt ... 01#p543101
Thanks I'll do that. My Pi has been working great for several years that I haven't followed this forum in a while, first time I've had a problem in a quite a while with it.