Pen detection is throttling.

Tech Support Input Device Support
1

Type of device* : Pen Tablet
Brand and version of the device: Huion HS64
System** : Windows 10

Description of the issue (you can include screenshots):
Hi! I’ve been experiencing this problem since yesterday afternoon (May 12, 2021, 3:00 p.m. PHT) and it’s bugging me really, REALLY hard.

The best I can is that the pen detection is throttling. I’d draw a line, it’s going to draw a dot onto where I started the line and then suddenly stop drawing, then maybe a few seconds later the line will continue wherever my hand was.

Another one is that when I move the pen really fast over the tablet, it’d lag real hard. I do this to erase sketches when I find something wrong.

All of this has never happened to me before. Is this something I need to repair my tablet for?

Screenshot of lines I made testing this out.

Screenshot (193)
Screenshot (193)1920×1080 358 KB

I believe you can clearly see that where the lines cut off, and where they continues (for the most part).

2

Do you remember if there was a Windows update shortly before this started to happen?
Were there any changes to your computer or krita or your Huion settings before this happened?

Does it happen with the Basic-2 Opacity or the Basic-1 brush presets?
Please try both of them.

Go to Settings → Configure Krita → Tablet Settings. Is is set to Wintab or Windows Ink?

Press the large Open Tablet Tester button to bring up the Tablet Tester window and move/drag it out to a large and useful size. Then do those same spiral strokes at maximum pressure on the grid area. Press hard.
Try slow strokes and fast strokes.

Note the tablet event listing in the right side. Do you get P=100.0% (or at least very high) all the time?

Does the P number (pressure reading) seem to correspond correctly to how hard you press?

3

No, there have been no updates this week nor the last.

Nope. No computer changes, Krita chnages nor Huion changes. I did try to use my Kamvas 13 to continue drawing around 4 hours ago, though…

Yes, more frequently in the Basic-1.

It is set to Wintab.

The pen detection would jump. One test, I’d started at ~X=20 and ~y=180, and then all of a sudden the tester would say “Pen tip taken away” “Pen tip brought near” and continued at ~X=150 and ~Y=80 despite me continually pressing down when making the same circular strokes.

It also starts of weak, at ~P=40.00%, and when the pen detection jump would happen, it’d drop to the low P=20.00% and below. When the jump doesn’t happen, it stays at a mighty P=100.00%.

At times, no. I’d say 3/5 of the time the P is wrong.

Another thing that happens is that even when the pen is near the tablet, the tester would detect the pen being “disconnected” multiple times in a second.

Here’s a part of the “log”:
Stylus move X=93.64 Y=81.29 B=1 P=96.2% (DRAW)

Stylus release X=93.64 Y=81.29 B=0 P=0.0%

Mouse move X=93 Y=81 B=1

Mouse release

Pen tip taken away

Pen tip brought near

Stylus press X=86.20 Y=197.34 B=1 P=63.4%

Stylus move X=86.20 Y=197.71 B=1 P=81.9% (DRAW)

Mouse press X=86 Y=197 B=1

Stylus move X=86.14 Y=198.14 B=1 P=91.6% (DRAW)

Stylus move X=86.08 Y=198.61 B=1 P=96.6% (DRAW)

Mouse move X=86 Y=198 B=1

Also, sorry for the late reply. I was nervous, so I cooked some caramelized apples for my Home Economics project (I burnt the caramel once).

4

No problem, there are no late replies here. Sometimes a ‘conversation’ takes place over many hours or even days.

That’s worrying because Basic-1 doesn’t use the pressure signal, only the position and pen presence/touch information.

That’s why even the Basic-1 is showing problems.

Did your Kamvas 13 work ok?

If you use a Kamvas 13 and also a HS64, does this mean that you installed two different Huion drivers on your computer and two different config/settings utilities or is there one unified utility for settings?
If it’s two drivers, that could be a source of problems.
Have you been doing mixed Kamvas 13 and HS64 use before with no problems?

Have they both been connected at the same time?

If you disconnect the Kanvas 13 and the HS64, restart your computer, then connect the HS64, does that have any effect on the behaviour with the HS64?

5

As for the two tablets, when I first got the Kamvas 13 and tried it, I uninstalled the driver for my HS64 (attempting to install another Huion driver will prompt you to delete the other, or any app in that case), installed the driver for the Kamvas 13 and it worked perfectly apart from pressure sensitivity and a comfortable way of zooming in/out.

I make sure to use the respective driver for the different devices. Back then, I thought I’d be able to use the Kamvas 13 driver for the HS64, but no, that circle (brush circle on the canvas to show where you’re painting) would warp elsewhere if I went to the lower right part of the HS64 tablet. After that, I reinstalled the proper driver for the HS64 and it worked perfectly fine.

No, they have not been connected at the same time, I don’t think my potato laptop can handle that. I’ve tried the restart by holding down the power button of my laptop, but the brush still throttles and lags around.

6

It’s probably unusual for anyone to regularly swap between devices by uninstalling/installing device drivers but as long as you do it properly and do it with devices disconnected and restart after the uninstall then restart again after the install, before you connect the chosen device, it should be ok.

The pressure sensitivity problem with the Kamvas 13 is probably a Wintab/Windows-Ink settings thing and maybe settings in the Kamvas 13 utility and also possibly the Windows system Windows Ink settings, of which there are many.

Try this: disconnect the HS64, unistall the driver, restart the laptop, reinstall the driver, restart and connect the HS64.
Open the utility and make sure that it’s internal ‘use Windows Ink’ option (if ii has one) is disabled, because you have it set to Wintab on the krita side.
Then go through all of its settings and options to make sure they are ‘sensible and reasonable’ and try any pressure reading facilities it may have inside it to make saure they look ok. (I only have experience of Wacom devices so I’m guessing what 's inside the Huion utility.)

If it looks ok inside the Huion utility, try it with krita.

Have you ever tried the HS64 with krita’s settings set to Windows Ink?
Maybe give that a try with the appropriate changes also made in the HS64 utility.

Having said all that, the fact that it loses the detection of the pen is worrying and does point to a problem with the Huion driver/utility or the tablet itself. Also, it happened suddenly with no apparent possible cause.

7

Thanks.

I shall do this tomorrow, bedtime is almost here. Have to sleep early to get up early, and my right knee’s also aching, probably due to stress.

Hopefully you don’t mind having to wait until tomorrow. I’m really sorry :sweat::sweat::sweat:

8

This is not a problem for me. You’re the one with the problems. Sleep well :slight_smile:

9

Hi, me again.

I tried out the procedure, uninstall, restart, reinstall, restart then test…

I then looked at the tablet settings, they were all good, then at the pen settings…

Screenshot (198)
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Screenshot (197)
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Screenshot (196)
Screenshot (196)1920×1080 1.56 MB

Screenshot (195)
Screenshot (195)1920×1080 1.57 MB

This is what it looks like, and unticked the “Enable Windows Ink”. The detection also seems to have worsened… It doesn’t even recognize me clicking my pen’s shortcut for the quick-triangle anymore…

10

I’m not sure what you mean by “the quick-triangle”. Maybe you mean the popup palette, activated by a right-click while using a painting tool, which does have a triangular colour selector in the middle of it.

The tablet tester in krita shows what’s coming into krita from the outside and you’ve seen that the signals are not good.
Problems with pressure signals can usually be fixed by settings changes but this problem is much more fundamental.
The fact that it happened suddenly, after some time of working ok with no changes from updates or settings changes by you, does suggest a problem with the tablet and/or driver and possibly even your laptop.

In a situation like this, I’d try it on a different computer.
Do you have a friend or relative who’d let you use their computer and install krita and try the HS64 on it?

I’ve run out of ideas at this stage and I’m sorry but i can’t offer any more ideas or suggestions.

11

Yes, this. I forgot the name.

No, most of the people I know of aren’t really people I’m super close with or don’t have a computer.

That’s okay, you’ve tried and it seems like this is a problem I have to personally deal with from here on. Thank you for your time!:pray::pray::pray: