unknown symbols errors when using OSS or ALSA USB Audio devices in official 10.03 Backfire builds

[ldolse]

USB Audio devices fail to work in the 2.6 backfire builds on broadcom hardware, not sure if other architectures are affected. A large number of 'unknown symbol' errors relating to audio functions are reported by dmesg upon plugging in an audio device.

Note building your own backfire image from svn with audio modules linked at compile time works correctly, seems to specifically be a problem with the build config for the official builds.

Hardware is Asus WL-500gP V2, another user reports the same problem on the wgt634u. See here for further backround:
​https://forum.openwrt.org/viewtopic.php?pid=106601

Key modules installed:
kmod-usb-core
kmod-usb2
kmod-usb-ohci
kmod-sound-core
kmod-usb-audio

dmesg output attached

[ldolse]

dmesg output - unknown symbols, audio related

[nico]

Can you confirm you're still experiencing this issue on 10.03 final ?

[nico]

Confirmed on an Asus WL-HDD (brcm47xx) running 10.03.

It seems 'kmod-sound-core' depends on 'kmod-input-core'.

root@OpenWrt:~#  logread
...
Jan  1 23:59:55 OpenWrt user.warn kernel: snd: Unknown symbol input_allocate_device
Jan  1 23:59:55 OpenWrt user.warn kernel: snd: Unknown symbol input_unregister_device
Jan  1 23:59:55 OpenWrt user.warn kernel: snd: Unknown symbol input_free_device
Jan  1 23:59:55 OpenWrt user.warn kernel: snd: Unknown symbol input_register_device
Jan  1 23:59:55 OpenWrt user.warn kernel: snd: Unknown symbol input_set_capability
Jan  1 23:59:55 OpenWrt user.warn kernel: snd: Unknown symbol input_event
...

[nico]

Fixed in [20901] (trunk) & [20902] (backfire)