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sound problems in ibook G4

hi. i'm having frequent troubles with sound drivers in my ibook G4
(kernel 2.6.9, sleep 6) and what seems to be their interaction with
pbbuttonsd. every now and then, sound simply stops working, and i get
kernel traces like this one:

Oops: kernel access of bad area, sig: 11 [#1]
NIP: 00000000 LR: D21CA8C0 SP: CB96FDB0 REGS: cb96fd00 TRAP: 0400    Not tainted
MSR: 40009032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11
TASK = cfbb92d0[2350] 'gtkpbbuttons' THREAD: cb96e000Last syscall: 4 
GPR00: 00000000 CB96FDB0 CFBB92D0 D1022000 00000BE7 00000000 00000000 D1068000 
GPR08: D1022000 D1068000 00000001 00000000 00000001 1002317C 100C0000 100A0000 
GPR16: 00000000 0F8C2480 00004002 00000000 00000000 00000200 CC41DCA0 C2E29880 
GPR24: 00000000 00000BE8 00000000 00000000 CAACD6AC CAACD690 CAACD620 00000200 
NIP [00000000] 0x0
LR [d21ca8c0] rate_transfer+0x80/0x88 [snd_pcm_oss]
Call trace:
 [d21ca8c0] rate_transfer+0x80/0x88 [snd_pcm_oss]
 [d21c7798] snd_pcm_plug_write_transfer+0xd4/0x14c [snd_pcm_oss]
 [d21c2520] snd_pcm_oss_write2+0xb0/0x128 [snd_pcm_oss]
 [d21c2774] snd_pcm_oss_write1+0x1dc/0x20c [snd_pcm_oss]
 [d21c5180] snd_pcm_oss_write+0x64/0xb4 [snd_pcm_oss]
 [c0062394] vfs_write+0xdc/0x128
 [c00624c4] sys_write+0x50/0x94
 [c0007e00] ret_from_syscall+0x0/0x44

does this ring a bell to someone?

thanks again for your help,
A man should never be ashamed to own he has been in the wrong, which is but
saying, in other words, that he is wiser today than he was yesterday.
-Alexander Pope, poet (1688-1744)

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