Bamoboo Ink + Dell Venue 5855 Pro waviness problem

[mkcn50]

Hi,
I recently started to use a Dell 5855 tablet which comes with a wacom digitizer. I'm using the tablet mostly for note taking and I am huge fan of wacom-enabled devices. But this time something wrong happens with the device/stylus. All straight lines become wavy. I tried the last wacom driver, the same result. I have access to two other wacom windows tables (Asus VivoTab Note 8 and HP Envy 8 Note), few other Samsung devices (Note 4 and Galaxy Tab S3) and a line of Microsoft Surface products and none of them have this kind of problem. I used the same Bamboo Ink with HP Envy 8 Note, it gives some waviness but it is hardly noticeable. When I start to write text on Venue Pro, some lines becomes compressed, letters are all wiggly. It is quite devastating. I replaced battery on the stylus and made sure no magnetic device

The waviness look pretty consistent. I even used a ruler (not in the demo) to produce more accurate motion but result is the same. You can see end line "dancing" around the tip while moving. It shows that some points tend to come closer to horizontal lines placed at the same step. Waviness doesn't depend on tablet performance. No matter if everything is slowed down by something in the background or if it in the tablet at the best performance mode. Is there any chance to solve this issue?
[img]https://i.ibb.co/q0rqgG5/Annotation-2018-11-28-140912-resized.jpg[/img]

[wacom5]

Please check which Protocol is being used by the Dell Hardware and make sure the Bamboo Ink is correctly setup. We know the 5055 is compatible and uses the AES protocol but I don't know about the 5855 version which you own. Please check here for more details: https://www.wacom.com/en-de/getting-started/bamboo-ink
Note: if the Stylus works normally in the HP computer, then perhaps there is an issue with the Dell's pen sensor, or some software setting need to be changed.

[mkcn50]

The Dell Venue 5855 Pro has Wacom AES technology. It is mentioned in the press-release of this device. I know that previous generation of Dell Venue 8 Pro was using different technology. I also located device in the device manager. Device identifies itself as HID\WCOM4809&Col04. It works with Bamboo Ink in AES mode.

[mkcn50]

I forgot to add that Dell Active Pen drivers for this tablet install a Wacom driver as well. So, is there any chances to fix waviness? Is it just calibration problem?

[wacom5]

I don't think this is a software calibration issue but you can give it a try: https://www.windowscentral.com/how-cali ... windows-10

I don't think the driver would cause this. If the calibration doesn't work, it's most likely a firmware issue, or a Hardware issue. We know the Bamboo Ink is not the issue here. Please check with Dell as well.

[mkcn50]

Thank you for calibration advice. It didn't work out. I actually read a lot about this jitter/wobble issue. I think this device is very useful and I couldn't find any way to upgrade it to anything modern of the same size. So I stuck here with inaccurate digitizer. Dell Venue 8 Pro 5855 is definitely using wacom aes controller. This is controller board from my tablet:
[img]https://i.ibb.co/d6JByvd/touch-controller-board-back.png[/img]
[img]https://i.ibb.co/N2kct6y/touch-controller-board-front.png[/img]
which communicates with tablet by i2c protocol.
So, I guess it is not manufactured by Dell. I made a small program to read straight 45° lines from stylus. I meticulously draw multiple parallel lines, saved coordinates. Here is the result:
[img]https://i.ibb.co/xLhmwKP/readings.png[/img]
The red points represent expected stylus position, black points are readings from the stylus.
It looks like pattern is periodic and I can guess that the issue is with the shape of touch electrodes on the screen. I check 3 other Dell Venue 8 Pro 5855 devices. They all have the same pattern. I doubt that it is an issue of one particular tablet.
Is there any possibility to update the controller board firmware to solve this issue? I'm using Bamboo Ink Stylus.
Can replacing of stylus solve this issue? I mean if all wacom aes enabled styluses have the same physical characteristics and replacing the stylus wouldn't solve the problem due some design flaw of some component?
Thank you