High CPU Usage from Lightburn

My version of lightburn seems to be occupying one of the CPU cores while it’s idling doing nothing.
It’ll sit in the background for a while and then my fans kick in and I know it’s done it again.
I’ve been through all the recent version updates 1 → 1.1 and it still seems to be doing it.
I found a similar (closed thread) and hopefully this is some relevant information for you.

Probably worth mentioning that when it’s in this state I have to end the task from task manager, it won’t close itself.


ntoskrnl.exe!KeSynchronizeExecution+0x5b66
ntoskrnl.exe!KeWaitForSingleObject+0x1460
ntoskrnl.exe!KeWaitForSingleObject+0x98f
ntoskrnl.exe!KeWaitForSingleObject+0x233
ntoskrnl.exe!ExWaitForRundownProtectionRelease+0x7dd
ntoskrnl.exe!KeWaitForSingleObject+0x3a29
ntoskrnl.exe!KiCheckForKernelApcDelivery+0x2b
ntoskrnl.exe!ExReleaseResourceAndLeaveCriticalRegion+0xc2
win32kbase.sys+0x44914
win32kfull.sys!NtHWCursorUpdatePointer+0x646
0x0000000000000000
win32u.dll!NtUserMsgWaitForMultipleObjectsEx+0x14
USER32.dll!MsgWaitForMultipleObjectsEx+0x9e
Qt5Core.dll!QEventDispatcherWin32::processEvents+0x394
qwindows.dll!qt_plugin_query_metadata+0x1dc9
LightBurn.exe+0x304f22
LightBurn.exe+0xf1a81
LightBurn.exe+0x3f3794
Qt5Core.dll!QMetaObject::activate+0x641
Qt5Widgets.dll!QAction::activate+0x10e
Qt5Widgets.dll!QMenu::actionGeometry+0x4f5
Qt5Widgets.dll!QMenu::actionGeometry+0x2c7
Qt5Widgets.dll!QMenu::mouseReleaseEvent+0xb9
Qt5Widgets.dll!QWidget::event+0xdc
Qt5Widgets.dll!QMenu::event+0x16c
Qt5Widgets.dll!QApplicationPrivate::notify_helper+0x140
Qt5Widgets.dll!QApplication::notify+0x7f3
Qt5Core.dll!QCoreApplication::notifyInternal2+0xb9
Qt5Widgets.dll!QApplicationPrivate::sendMouseEvent+0x3f3
Qt5Widgets.dll!QSizePolicy::QSizePolicy+0x2408
Qt5Widgets.dll!QSizePolicy::QSizePolicy+0xb45
Qt5Widgets.dll!QApplicationPrivate::notify_helper+0x140
Qt5Widgets.dll!QApplication::notify+0x1a97
Qt5Core.dll!QCoreApplication::notifyInternal2+0xb9
Qt5Gui.dll!QGuiApplicationPrivate::processMouseEvent+0x8c1
Qt5Gui.dll!QWindowSystemInterface::sendWindowSystemEvents+0x92
Qt5Core.dll!QEventDispatcherWin32::processEvents+0xde6
USER32.dll!CallWindowProcW+0x3f8
USER32.dll!DispatchMessageW+0x259
Qt5Core.dll!QEventDispatcherWin32::processEvents+0x5b0
qwindows.dll!qt_plugin_query_metadata+0x1dc9
Qt5Core.dll!QEventLoop::exec+0x1cb
Qt5Core.dll!QCoreApplication::exec+0x141
LightBurn.exe+0xaf8e
LightBurn.exe+0xb029
LightBurn.exe!FT_WriteEE+0x2ba934
LightBurn.exe!FT_WriteEE+0x2b99eb
KERNEL32.DLL!BaseThreadInitThunk+0x14
ntdll.dll!RtlUserThreadStart+0x21

Fantastic. Thanks for capturing this.
Can you tell me more about the computer and the OS you’re experiencing this on?

|—|—|
|Processor|Intel(R) Core™ i7-4720HQ CPU @ 2.60GHz 2.60 GHz|
|Installed RAM|12.0 GB (11.9 GB usable)|
|System type|64-bit operating system, x64-based processor|

Edition Windows 10 Home
Version 21H1
Installed on ‎18/‎08/‎2020
OS build 19043.1526
Experience Windows Feature Experience Pack 120.2212.4170.0

When was the last time you rebooted your system? I’ve seen all kinds of weirdness in Windows when it’s not allowed to reboot after an update, and none of us are able to reproduce this issue here.

I’m usually pretty good at update/restart and it occasionally dies anyway because it’s a laptop with about 10 mins of battery life left.
I’ll keep an eye on it though.

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