Note that the color depth bit is the MSB of PM.EDID_SEL (which represents the resolution).
In case 8bpp is selected, set the color depth bit accordingly.
For example, when selecting 1600x900@60 at 8bpp, PM.EDID_SEL = 86h=134 dec;
and when selecting it at 12bpp, PM.EDID_SEL = 6h=6 dec
Also note that the modeline bit is bit 6 of PM.EDID_SEL (which represents the resolution). In
case single modeline is selected, set the modeline bit accordingly.
For example, when selecting 1600x900@60 in Single modeline (12bpp), PM.EDID_SEL =
46h=70 dec; and when selecting it in Multiple modelines (12bpp) , PM.EDID_SEL = 6h=6
dec