On 6/23/22 20:51, José Expósito wrote:
I would of course fix this, but I don't really know what's the preferred
way. One can obviously simply set up an urb to catch this, but it would
have to be a special corner case for the mini 7, as José assures me that
none of his tablets display similar behavior. Is this acceptable?
My tablets also send an ACK packet, but in my case it does not have any
visible effects. Maybe it is related to the DE environment used. I
tested it on elementary OS (Ubuntu) and Fedora 36, in both cases the
ACK is ignored... But catching it is fine, we can include the code you
suggest.
José already had a look at some firmware device descriptor string that
reports the number of buttons and what not, but as far as I know, it
doesn't say anything about ack packets (right José? Does it say
anything about touch strips or similar?).
In the devices I tested, the ACK packet is always present, so it should
be fine to catch it. I'll test your patch in all the devices I own to
be safe.
I think it's OK to just ignore the first packet for these devices, even if the
ACK packet is not sent for some of them. Even with the report rate of 20 years
ago nobody would've noticed if you dropped one packet.
Nick
