>> I'm trying to run Coreboot on Lenovo G505s and have a problem:
>> - backlight of LCD is not turn on. But on the external LCD (by CRT
>> connector) is all good.
>>
>> Could you help me with a solution to this problem?

Sorry for such a long reply, but what is a current status of this problem?
Have you resolved the LCD backlight problem with your G505s - and, if yes, how?