From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Henrik Rydberg" <rydberg@euromail.se>
Subject: Re: QUANTA touchscreen controller integrated in HP2310ti no longer
 recognised (regression in 3.5 and later as compared to 3.3)
Date: Wed, 22 Aug 2012 19:04:03 +0200
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To: Simon Farnsworth <simon.farnsworth@onelan.co.uk>
Cc: Henrik Rydberg <rydberg@bitmath.se>, linux-input@vger.kernel.org, Benjamin Tissoires <benjamin.tissoires@gmail.com>, Benjamin Tissoires <benjamin.tissoires@enac.fr>, Jiri Kosina <jkosina@suse.cz>

> > What does 'cat /sys/bus/hid/devices/0003:0408:3001.0001/modalias' say?
> 
> It's the same whether or not I revert the patch:
> 
> # cat /sys/bus/hid/devices/0003:0408:3001.0001/modalias
> hid:b0003g0000v00000408p00003001
> 
> If I've understood hid-code.c correctly, this means that 
> hdev->group == HID_GROUP_ANY, implying that neither hid_scan_usage nor 
> hid_scan_report have run.

Correct, and your subsequent patch is spot on.

Thanks,
Henrik