We are developing a Linux solution. Our platform is using Intel SandyBridge and its VGA (kernel 2.6.35.8, 915 KMS driver).
We found system will show garbage at the moment VGA is hand over to OS after BIOS POST. The symptom doesn’t happen in WIN 7. After checking with EE, the LCD_VDD_EN pin is pull low again when boot to Win 7. However, this pin is not pull low when boot to Linux. After BIOS POST, there’s a power reset during driver loading for resolution pattern sending. It’s why driver needs to control PCH "L_VDD_EN" for power reset, and the panel spec suggests to have VDD power off for >=500ms. Please refer to the VDD power monitoring image: http://imageshack.us/photo/my-images/827/auoi.jpg/ Need help to fix the issue in driver.
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