# IQ Audio DAC Pro, no sound (the usual "failed to open ALSA hw 2.0") **URL:** \ **Category:** Help and Support\ **Created:** [October 24, 2021, 12:49pm UTC](https://community.volumio.com/t/iq-audio-dac-pro-no-sound-the-usual-failed-to-open-alsa-hw-2-0/50515 "2021-10-24T12:49:23Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![gattonero](https://community.volumio.com/user_avatar/community.volumio.com/gattonero/32/11998_2.png) [@gattonero](https://community.volumio.com/u/gattonero)\ **Post date:** [October 24, 2021, 12:49pm UTC](https://community.volumio.com/t/iq-audio-dac-pro-no-sound-the-usual-failed-to-open-alsa-hw-2-0/50515/1 "2021-10-24T12:49:23Z")
Hello. Can’t find this specific issue in previous threads, so here I am (and yes I have rebooted several times to no avail…) Have a Rpi3b+, powered by official Pi4 supply, new SD card, installed the IQ Audio card with a Waveshare 3.5" Lcd on top. Installation of the screen went well with no real issues, image and touch working well. But there’s no sound, the audio hardware (cable, amp) is proof since it works with anyhting else and was working with the previous Pirate Audio Line-out. I have followed the official instructions ([https://datasheets.raspberrypi.com/iqaudio/iqaudio-product-brief.pdf](https://datasheets.raspberrypi.com/iqaudio/iqaudio-product-brief.pdf)) to select “IQ Audio Digiamp+” as l2s, but have the “failed to open ALSA hw 2.0” message, which seems to be a wrong/unsupported DAC? I have tried to select different DAC types resulting in the same error message. If I select “HifiBerry DAC+” there’s no error messages but still no sound. Has anyone had the same issue? I am a bit puzzled here. Thanks! ---
**Author:** ![gattonero](https://community.volumio.com/user_avatar/community.volumio.com/gattonero/32/11998_2.png) [@gattonero](https://community.volumio.com/u/gattonero)\ **Post date:** [October 24, 2021, 3:35pm UTC](https://community.volumio.com/t/iq-audio-dac-pro-no-sound-the-usual-failed-to-open-alsa-hw-2-0/50515/2 "2021-10-24T15:35:06Z")
Forgot to add the aply -l log: > volumio@volumiotouch2:~$ aplay -l > \*\*\*\* List of PLAYBACK Hardware Devices \*\*\*\* > card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA] > Subdevices: 4/4 > Subdevice #0: subdevice #0 > Subdevice #1: subdevice #1 > Subdevice #2: subdevice #2 > Subdevice #3: subdevice #3 > card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 IEC958/HDMI [bcm2835 IEC958/HDMI] > Subdevices: 1/1 > Subdevice #0: subdevice #0 > card 0: ALSA [bcm2835 ALSA], device 2: bcm2835 IEC958/HDMI1 [bcm2835 IEC958/HDMI1] > Subdevices: 1/1 > Subdevice #0: subdevice #0 > card 1: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones] > Subdevices: 3/3 > Subdevice #0: subdevice #0 > Subdevice #1: subdevice #1 > Subdevice #2: subdevice #2 something’s not right here, the IQ Audio card is not listed… Also the /boot/config.txt: > volumio@volumiotouch2:~$ cat /boot/config.txt > initramfs volumio.initrd > gpu\_mem=32 > max\_usb\_current=1 > dtparam=audio=on > audio\_pwm\_mode=2 > dtparam=i2c\_arm=on > disable\_splash=1 > hdmi\_force\_hotplug=1 > gpio=0-9=a2 > gpio=12-17=a2 > gpio=20-25=a2 > dtoverlay=dpi18 > enable\_dpi\_lcd=1 > display\_default\_lcd=1 > extra\_transpose\_buffer=2 > dpi\_group=2 > dpi\_mode=87 > dpi\_output\_format=0x6f006 > hdmi\_timings=640 0 20 10 10 480 0 10 5 5 0 0 0 60 0 60000000 1 > dtoverlay=waveshare-35dpi-3b-4b > dtoverlay=waveshare-35dpi-3b > dtoverlay=waveshare-35dpi-4b > include userconfig.txt > > #### Volumio i2s setting below: do not alter > > dtoverlay=iqaudio-dacplus,unmute\_amp and > volumio@volumiotouch2:~$ cat /boot/cmdline.txt > splash quiet plymouth.ignore-serial-consoles dwc\_otg.fiq\_enable=1 dwc\_otg.fiq\_fsm\_enable=1 dwc\_otg.fiq\_fsm\_mask=0xF dwc\_otg.nak\_holdoff=1 console=serial0,115200 kgdboc=serial0,115200 console=tty1 imgpart=/dev/mmcblk0p2 imgfile=/volumio\_current.sqsh elevator=noop rootwait bootdelay=5 logo.nologo vt.global\_cursor\_default=0 loglevel=0 snd-bcm2835.enable\_compat\_alsa=1 snd\_bcm2835.enable\_headphones=1 ---
**Author:** ![Mounter01](https://community.volumio.com/letter_avatar_proxy/v4/letter/m/46a35a/32.png) [@Mounter01](https://community.volumio.com/u/Mounter01)\ **Post date:** [April 10, 2023, 7:07am UTC](https://community.volumio.com/t/iq-audio-dac-pro-no-sound-the-usual-failed-to-open-alsa-hw-2-0/50515/3 "2023-04-10T07:07:58Z")
May sound trifle, but have you tried to select **IQAuido DAC Plus** az I2S DAC from the list? I have the exact same DAC (just the descendant “Raspberry DAC Pro”) and it works with this option.