Hi,
Dedicated video memory settings will be made on BIOS. I would suggest you to increase the dedicated video memory in the BIOS by referring to the computer manufacturer website or the manual.
You may try installing latest version of the graphic card drivers and check if it helps.
If the issue persists, you may try installing latest BIOS updates from the manufacturer’s website and see if it makes any difference.
Note: Modifying BIOS/complementary metal oxide semiconductor (CMOS) settings incorrectly can cause serious problems that may prevent your computer from booting properly. Microsoft cannot guarantee that any problems resulting from the configuring of BIOS/CMOS settings can be solved. Modifications of the settings are at your own risk.
Keep us posted on the status of the issue.