As most people who did the IPS display swap seem to have problems with using it in BIOS or Bootmode I decided to put a solution for it online.
I had the same issue after installing the IPS display and spent lots of hours searching for a older BIOS than R0142C5. By now I am quite sure that (even if you you would get such a BIOS from sony) this is not the solution. In addition, who would ever like to do a Downgrade if it its not necessary![:)]( "Smile :)")
The real problem is the 128 Bit EDID...
Sony Vaio S13 IPS Display BIOS / Brightness Issue solved (EDID)
I had the same issue after installing the IPS display and spent lots of hours searching for a older BIOS than R0142C5. By now I am quite sure that (even if you you would get such a BIOS from sony) this is not the solution. In addition, who would ever like to do a Downgrade if it its not necessary
The real problem is the 128 Bit EDID...
Sony Vaio S13 IPS Display BIOS / Brightness Issue solved (EDID)