<Furmark> Monitor can't display full screen after switch the display mode

[hanhuang]

Monitor can not display full screen and Snowflake screen observed after switch the display mode during running Furmark

Need Help to check the root cause for issue fix


Steps:
1. Run furmark and switch the display mode to the other.
2. Found the monitor can not show full screen / monitor show Snowflake

Note: we can see the issue with LG 27UD88(Max resolution:3840x2160),ViewSonic VX2457(Max resolution:1920x1080),DELL E2416H(Max resolution:1920x1080),HP Z24i(Max resolution:1920x1080)

Analyze result from IHV vender:
Furmark doesn't change test resolution when change display mode