Re: [DIGImend-users] Huion H610 maximum pressure events

[Dan R. <ade...@gm...>]

In case anyone is curious, I bought a replacement pen from amazon that
claimed to be compatible with the Huion H610 and my monoprice rebranded
tablet. I've only been using it for 10 minutes but it works perfectly, my
other pen is still generating "random" right and left click events when
it's in proximity with the tablet. So yes, *hardware failure, and in the
pen thankfully, not the tablet. *

For giggles, I tried disassembling my old (broken) pen as described here:
https://www.youtube.com/watch?v=qsrin9JXSQw and adjusting the tightness of
the white piece which carries the sense coil. *I immediately broke the
delicate coil wires*, but resoldered them successfully. Unfortunately, it
didn't resolve my issue (the random full-pressure events) I suspect that
with further adjustment of the white piece, I could fix my old pen, but the
coil wires are *very delicate* and so I don't really recommend doing it
unless it's a last resort before ordering a replacement. I may try again
since I have a replacement pen now.

*TL;DR: My random "full pressure" events were apparently resolved by
replacing the pen (~15USD), there is some possibility of fixing the issue
also by disassembling the pen but it's easy to do more damage than good.*

Cheers,
Dan

On Sun, Mar 29, 2015 at 9:09 AM, Nikolai Kondrashov <sp...@gm...>
wrote:

> Hi Dan,
>
> On 03/28/2015 11:39 PM, Dan Roberts wrote:
>
>> Hi Everyone,
>>      I've had my Huion H610 for almost a year now, and it has exhibited
>> the same behavior the entire time I've owned it, across multiple drivers
>> versions, and across changing the pen "tip".
>>
>> Occasionally when the pen is not touching the tablet, but in proximity, I
>> receive events for full pressure (2047), sometimes in rapid succession.
>> Pressure will spike from 0 to 2047 and back. When drawing in Gimp it sort
>> of looked like the tool was "dripping", as max pressure events made large
>> marks on the image. I instrumented hid-huion with a large amount of logging
>> and observed that these events existed at the kernel level, and I was able
>> to mitigate (or eliminate?) them by detecting instantaneous transitions
>> between minimum and maximum pressure and throwing out these events. This
>> was admittedly a pretty dirty hack, and I haven't ported it over to driver
>> v5 yet.
>>
>> *Has anyone else with a H610 noticed this problem?*
>> *
>> *
>> It seems there's some possibility it could be a hardware OR software
>> issue, so I'm curious if anyone else has noticed this.
>>
>
> I think I've heard about this before, but can't find any evidence ATM. I
> suspect it's rather a hardware issue. You can check with "usbhid-dump -es".
> If you see the pressure jumps there (the last two bytes in pen report),
> then
> it is 99% a hardware failure.
>
> Nick
>