I think you may find a bit of what you are looking for here click here but I am not able to say for sure if it is possible with Integrated Graphics on a laptop. My view is that it's not. Others may have different opionions.
Instructions for changing video memory For integrated video memory that is adjustable, use the following steps to change the amount of video memory (RAM) from the PC BIOS Setup:
1. Turn on the PC. 2. When the screen appears, press the F1 key. Entering Setup should appear on the screen. 3. When BIOS Setup screen appears, use the RIGHT ARROW key to select the Advanced screen. 4. Use the down Arrow key to select the video memory setting; for example; VGA RAM Size, integrated video, or On-Board Video Memory. 5. Press the Enter key. 6. Use the down Arrow key to select the desired amount of memory or memory setting that is listed and then press the Enter key.