just to recap for other users: i resolved updating the dock firmware to version  01.00.32, 01.00.16 released on 25 may 2023 and updated the bios of my laptop (vostro 7620) to version 1.13.0, 13 june then i applied the registry hack below and resetted the dock pressing for 1 minute the power button without the power adapter or the laptop attached registry hack (reddit post): Alternatively, creating a .reg file will automate adding the registry keys. Just open notepad and copy the highlighted text into it, then save as "Disable_MSTDSC.reg". Execute the file on systems needing the change. Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4d36e968-e325-11ce-bfc1-08002be10318}\0000] "DPMstDscDisable"=dword:00000002 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4d36e968-e325-11ce-bfc1-08002be10318}\0001] "DPMstDscDisable"=dword:00000002 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4d36e968-e325-11ce-bfc1-08002be10318}\0002] "DPMstDscDisable"=dword:00000002
I'm experiencing some strange behavior with the latest firmware of the Dell Dock WD19  DellDockFirmwarePackage_WD19_WD22_HD22_Series_01.00.09.exe after installing the firmware the 2 external monitors attached to the dock randomly turn blank for a few seconds i updated all the driver/firmware/bios to latest version this is clearly a firmware bug because it happened with 2 different wd19 docks. they worked fine until being updated inexplicably dell does not provide the older firmware to rollback it   sorry for the screenshot quality, i did not expect to publish it    
Latest WD19 firmware not working with Vostro 7620