You can pass options to vesafb using "video=vesafb:option" on
the kernel command line. Multiple options should be separated
-by comma, like this: "video=vesafb:ypan,invers"
+by comma, like this: "video=vesafb:ypan,inverse"
Accepted options:
-invers no comment...
+inverse use inverse color map
ypan enable display panning using the VESA protected mode
interface. The visible screen is just a window of the