On Thu, 26 Dec 2019 10:47:18 +0100, Paul Menzel wrote:
Dear Linux folks,
With
$ git describe --tags drm-tip/drm-tip v5.5-rc3-1481-ga20d8cd6901athe internal audio device is not available, and just a dummy device.
Running `alsa-info.sh` [1], the messages below are shown with the problematic Linux kernel.
alsactl: get_controls:567: snd_ctl_open error: Sound protocol isnot compatible cat: /tmp/alsa-info.ateDlDjrZX/alsactl.tmp: No such file or directory
That's an unexpected side-effect of the recent protocol version bump in sound.git for-next branch. It seems that we can't change the minor version unless we really want to break something.
Below is the fix patch. Please give it a try.
thanks,
Takashi
-- 8< -- From: Takashi Iwai tiwai@suse.de Subject: [PATCH] ALSA: control: Fix incompatible protocol error
The recent change to bump the ALSA control API protocol version from 2.0.7 to 2.1.0 caused a regression on user-space; while the user-space expects both the major and the minor versions to be identical with the supported numbers, we changed the minor number from 0 to 1.
For recovering from the incompatibility, this patch changes the protocol version again to 2.0.8, which is compatible, but yet higher than the original number 2.0.7, indicating that the protocol change.
Fixes: bd3eb4e87eb3 ("ALSA: ctl: bump protocol version up to v2.1.0") Reported-by: Paul Menzel pmenzel@molgen.mpg.de Signed-off-by: Takashi Iwai tiwai@suse.de --- include/uapi/sound/asound.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index e36dadaf84ba..30ebb2a42983 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -936,7 +936,7 @@ struct snd_timer_tread { * * ****************************************************************************/
-#define SNDRV_CTL_VERSION SNDRV_PROTOCOL_VERSION(2, 1, 0) +#define SNDRV_CTL_VERSION SNDRV_PROTOCOL_VERSION(2, 0, 8)
struct snd_ctl_card_info { int card; /* card number */