David Ford wrote:
> It seems that 2.6.12-rc1 introduced an ALSA bug generating an oops for a
> null pointer.
>
> codec_semaphore: semaphore is not ready [0x1][0x300300]
> codec_read 0: semaphore is not ready for register 0x2c
> Unable to handle kernel NULL pointer dereference at virtual address
> 00000000
>
> This happens on multiple machines, 32b and 64bit. I'll be happy to
> provide further information if needed.
This only happens when you mismatch your kernel and alsa-lib versions, e.g.
running alsa-lib-1.0.9-rc2 with alsa-1.0.8 in-kernel drivers, or possibly
vice-versa.
Daniel
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