[NAME]  You cannot increase video memory for integrated graphics.  This has not been an option for over 15 years now.  
I have a Latitude E7240 without a battery that I converted to Ubuntu 18.04 on a 16Gb mSATA card. Although it has 8Gb RAM, there is some video buffering, the BIOS A18 video version 2178v15 has a fixed memory of only 64Mb. Thus, I would like to increase the latter by 2-4x to reduce the buffering. I found on a Dell support webpage that the BIOS version is now A27 or A29, but the upgrade cannot be performed without a battery, which died and was discarded. I also learned Dell has changed its instructions for upgrading BIOS over the years, so I need specific guidance on upgrading a Ubuntu system. Thanks.
Increasing video memory by upgrading BIOS in Ubuntu but without a battery?