Fixing No Sound / No Mic/ Dummy Output on Fedora 43 (HP ProBook 450 G9 Dual Boot)

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Problem Summary And Fixes

Device: HP ProBook 450 G9 Notebook PC (Intel i7-1255U, Fedora 43, dual boot with Windows)

After installing Fedora, there was no sound and no microphone. The system showed dummy output and no audio devices were detected.

Checks showed:

  • /proc/asound/cards was empty
  • aplay -l showed no soundcards
  • Audio hardware was visible in lspci, so hardware was fine

Root Cause

The system was using Intel SOF (Sound Open Firmware) driver:

  • snd-intel-dspcfg.dsp_driver=3

This driver failed to start on this laptop. Kernel logs showed DSP boot failure and timeout errors. Because of this, no sound device was created in the system.

Solution

Switch from SOF driver to legacy HDA driver.

Steps to fix

1. Edit GRUB config

sudo nano /etc/default/grub

Find this line:

GRUB_CMDLINE_LINUX="rhgb quiet snd-intel-dspcfg.dsp_driver=3"

Change it to:

GRUB_CMDLINE_LINUX="rhgb quiet snd-intel-dspcfg.dsp_driver=1"

2. Update GRUB

sudo grub2-mkconfig -o /boot/grub2/grub.cfg

3. Reboot system

sudo reboot

4. Check after reboot

cat /proc/asound/cards

You should see HDA Intel PCH sound card.

Result

After this change:

  • Sound started working
  • Microphone started working
  • Dummy output issue was fixed

Conclusion

The issue was caused by SOF driver failure on Intel Alder Lake hardware in Fedora. Switching to legacy HDA driver (dsp_driver=1) fixed the problem completely.

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