linux-kernel - Re: PROBLEM: Regression likely in hid_uclogic driver breaks Huion Inspiroy H640 drawing tablet

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Date:   Tue, 26 Jul 2022 22:56:33 -0400
From:   Stefan Hansson <newbie13xd@...il.com>
To:     José Expósito <jose.exposito89@...il.com>
Cc:     Jiri Kosina <jikos@...nel.org>,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Ping Cheng <ping.cheng@...om.com>,
        Peter Hutterer <peter.hutterer@...-t.net>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: Regression likely in hid_uclogic driver breaks Huion
 Inspiroy H640 drawing tablet

Hi!

>> Thanks for looking into this! Bisecting has been slow on my end
>> unfortunately. I built today's linux-next (20220726) with your proposed
>> patch below and my drawing tablet curiously still does not work as expected.
>> The stylus works a couple of times, but eventually stops working (unlike
>> prior where it always seemed to only work once). Do I need both your revert
>> and this diff for it to work properly?
> 
> You are right, I just tested for a while with the diff applied (without
> reverting the commit causing the issue) and after putting the pen in
> and out proximity a fair amount of times (> 100) it stopped working.

This part is peculiar to me. When I said "a couple of times", I really 
meant a couple of times. For me, this issue reproduces after maybe 10 
times at most. I have never been able to do it for anything close to 100 
times. I wonder what's up with this disparity?

Regards,
Stefan Hansson