Lowering the power efficiency slider will not disable Panel Self Refresh. That specific slider controls a different feature called Intel Display Power Saving Technology, which dynamically alters your screen brightness and contrast based on the content you are viewing. Panel Self Refresh is a hardware-level protocol that dictates whether the graphics card temporarily stops sending rendering frames to the physical monitor entirely, which is the exact mechanism conflicting with the Windows Ink drawing tools.
The complete absence of the Panel Self Refresh toggle in your interface confirms the complications introduced by the generic Intel driver update. In recent generic driver branches, Intel often hides these advanced power toggles or migrates them to a completely different utility called Intel Arc Control, effectively locking users out of crucial hardware configurations when using the standard Command Center application.
Because the software interface prevents us from manually disabling this power state, we must execute the driver reversion strategy discussed previously. Please open the Windows Device Manager, expand the Display adapters section, right-click your Intel Graphics device, and select Properties to click the Roll Back Driver button. If that button is greyed out, you must visit the official HP support portal, search for your specific EliteBook 640 G11 model, and download their certified Intel Video Driver package. Installing that manufacturer-approved driver will overwrite the generic installation and restore the proper hardware synchronization protocols required to stop the drawing overlay from freezing your system.
VP