Hi, Can you try Java mode instead of Native and see if that works? You may also want to try to install the chipset driver, sometimes installing that resolves the issue. [URL]  
Have a T630 with iDRAC 8 Enterprise f/w 2.21.21 (Build 12). Would like to pass the Ctrl+Esc key sequence to the system, but this is intercepted by Windows. This occurs regardless of whether the 'Pass all keystrokes to target' option is checked, or if I am in full screen mode. On a T620 and iDRAC 7 Enterprise, this sequence could be passed to the Dell system. Any one have ideas on how to enable the pass through of this sequence?
idrac8 keyboard pass through mode