Sample corruption

[jsiddall]

Describe the bug
Installed a new laptop running Ubuntu 24.04.3 to run OpenHantek6022 but display frequently shows corrupted data (looks like missing samples)

To Reproduce
IMPORTANT: Always unplug and replug the scope if used before with a different application, e.g. sigrok or the original Hantek software.
No support for non-Linux related issues unless a volunteer steps in!

Steps to reproduce the behavior:

1. Start OpenHantek6022, notice that display glitches several times per second with what appears to be missing samples.

Expected behavior
Steady datastream displayed

Screenshots
Attached shows capture connected to built-in calibration signal. Results are the same for external function generator.

Computer environment (please complete the following information):

• OpenHantek version: 3.4.0
• OS: Ubuntu 24.04.3 with all updates
• Distribution, version: Intel N4500 CPU
• Screen resolution, screen setup (e.g. multimonitor, etc.): 1280x720
• Video hardware: Integrated Graphics
• OpenGL version: N/A
• Qt version: N/A
• C++ compiler version: N/A

Scope device (please complete the following information):

• Device: Hantek 6022BE
• Program top line: OpenHantek6022 (3.4.0)
• Input signal: calibration out 1 kHz
• Probe setting: probe X10, same result on other channel X1

Additional context
The symptoms look a lot like issue #207 but with a very different kernel (6.10) and attempts to turn off power saving on USB with powertop did not help.

Also plugged into a different USB port but that did not change anything either.

I realize this may be a kernel issue but it has a severe impact on OpenHantek so any advice on how to resolve would be appreciated.

[jsiddall]

Update: I noticed that the capture corruption improves if I constantly move the mouse while capturing, adding evidence that this is a USB power saving related issue. Still no ideas how to resolve though.

[FauxFaux]

I have the same issue, but only on my laptop and not desktop with the same scope.

Very, very obvious when trying to see a 50Hz (mains) sine wave:

For me, toggling Runtime PM for PCI Device Intel Corporation 100 Series/C230 Series Chipset Family MEI Controller #1 (0000:00:16.0) in powertop resolves the issue. I found this by randomly toggling things in desperation. Changing other USB related items does not work.

[jsiddall]

I have the same issue, but only on my laptop and not desktop with the same scope.

For me, toggling Runtime PM for PCI Device Intel Corporation 100 Series/C230 Series Chipset Family MEI Controller #1 (0000:00:16.0) in powertop resolves the issue. I found this by randomly toggling things in desperation. Changing other USB related items does not work.

Thanks! I will give that a try. When you say toggling, I assume you mean turning it on?

[FauxFaux]

Thanks! I will give that a try. When you say toggling, I assume you mean turning it on?

Turning it from what powertop calls "good" (power saving on?) to what powertop calls "bad" (power saving off?).