[alsa-devel] snd_hwdep_open() as non-root user

Rafal Powierski powierski at mediascore.de
Thu Oct 4 18:06:48 CEST 2012

Thank you Clemens,
sudo setcap cap_sys_rawio... solves the problem :)
I only need to ad it to the qt build or to the app itself.
Best Regards,

-----Original Message----- 
From: Clemens Ladisch
Sent: Thursday, October 04, 2012 2:50 PM
To: Rafal Powierski
Cc: alsa-devel at alsa-project.org
Subject: Re: [alsa-devel] snd_hwdep_open() as non-root user

Rafal Powierski wrote:
> I would like to access pin verb hda interface using snd_hwdep_open() 
> function.
> It works fine if I run as root.
> I hope there is a way to configure my kubuntu so I can do it as non-root 
> user (e.g. debugging)
> so far, I have been trying changing access flags for devices in /dev/snd/ 
> directory to crwxrwxrwx no plus character.
> It did not change my privileges for snd_hwdep_open() -  still returns –13.

sound/pci/hda/hda_hwdep.c says:

static int hda_hwdep_open(struct snd_hwdep *hw, struct file *file)
if (!capable(CAP_SYS_RAWIO))
return -EACCES;
return 0;

Alsa-devel mailing list
Alsa-devel at alsa-project.org

More information about the Alsa-devel mailing list