[alsa-devel] [PATCH] snd_usb_audio: fix SB Extigy IR Remote regression

Takashi Iwai tiwai at suse.de
Tue Aug 5 11:54:54 CEST 2008

At Tue, 5 Aug 2008 11:01:00 +0200,
Phil Jordan wrote:
> From: Phillip Michael Jordan <phil at philjordan.eu>
> The support for the SB Extigy's remote seems to be broken in all
> recent ALSA versions, including 1.0.17. The driver detects the event
> correctly, then submits a URB to query the RC code. On the Extigy, the
> URB is submitted with a length of 2 bytes. My hardware, however, only
> replies with 1 byte, containing the correct RC button code. The
> current implementation discards this as being too short. (line 1784 of
> usbmixer.c)
> This patch specifies a "minimum packet length" in the remote control
> configuration. I've left the values for the Audigy 2/Live! the same as
> the packet length, as I'm assuming the existing code works with them.
> (I don't have the hardware to confirm) This fixes the Extigy RC
> support, e.g. for use with Lirc.
> Signed-off-by: Phillip Michael Jordan <phil at philjordan.eu>
> ---
> An alternative, simpler fix would be to change the check on line 1784 to
> if (urb->status < 0 || urb->actual_length < rc->offset + rc->length)
> On the Extigy, this works out the same as the fix proposed in the
> patch (urb->actual_length < 1), but I have no idea how this would
> behave with the other types of hardware.

I think your fix is more flexible because you can set a different
value for each device type in case any device behaves differently.

Thus I applied your patch as is on my tree now.



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