[Buildroot] Alsa problem with arm 2.6.23.1 and uclibc
ing. Federico Fuga
fuga at studiofuga.com
Fri Nov 16 10:27:48 UTC 2007
Hi,
Do you know of any problem with alsa and uclibc and kernel 2.6.23 on arm?
I built a uclibc buildroot, now all works fine except alsa. Aplay can
see the devices, but alsactl cannot change the mixer levels:
# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: EMX270 [EM-X270], device 0: AC97 HiFi AC97 HiFi-AC97-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: EMX270 [EM-X270], device 1: AC97 Aux AC97 Aux-AC97-1 []
Subdevices: 1/1
Subdevice #0: subdevice #0
# aplay -L
default:CARD=EMX270
EM-X270,
Default Audio Device
null
Discard all samples (playback) or generate zero samples (capture)
# alsactl restore
alsactl: set_control:1159: Cannot write control '2:0:0:Speaker Playback
Volume:0' : Inappropriate ioctl for device
# alsactl store -f /root/sample
alsactl: get_control:218: Cannot read control '2,0,0,Speaker Playback
Volume,0': Inappropriate ioctl for device
The devices in /dev/snd seems ok:
# ls /dev/snd/ -l
crw-rw-rw- 1 root root 116, 0 Dec 31 17:00 controlC0
crw-rw-rw- 1 root root 116, 24 Dec 31 17:00 pcmC0D0c
crw-rw-rw- 1 root root 116, 16 Dec 31 17:00 pcmC0D0p
crw-rw-rw- 1 root root 116, 17 Dec 31 17:00 pcmC0D1p
crw-rw-rw- 1 root root 116, 33 Dec 31 17:00 timer
The strange thing is that in an Angstrom Linux based on glibc and the
same kernel and alsa-lib/utils/libasound version (same patches, same
all) it works without problems.
last few lines of strace output of alsactl restore :
open("/usr/lib/libasound.so.2", O_RDONLY) = 4
fstat(4, {st_mode=S_IFREG|0755, st_size=959649, ...}) = 0
close(4) = 0
open("/dev/snd/controlC0", O_RDONLY) = 4
close(4) = 0
open("/dev/snd/controlC0", O_RDWR) = 4
ioctl(4, USBDEVFS_CONTROL, 0xbef809cc) = 0
ioctl(4, UI_DEV_CREATE, 0xbef80ab0) = 0
ioctl(4, USBDEVFS_CONNECTINFO, 0xbef80634) = 0
ioctl(4, USBDEVFS_HUB_PORTINFO, 0xbef80748) = -1 ENOTTY (Inappropriate
ioctl for device)
Any idea?
Thank you in advance!
best regards,
ing. Federico Fuga
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