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

[Nikolai K. <sp...@gm...>]

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