PTN3460I显示界面重复（单条LVDS通道）

[Caleb_NJXDS]

你好，

       我用的是PTN3460I芯片，作EDP-LVDS转换，用了一条LVDS通道，电路已经调通，屏幕用的是1024*768。 在系统BIOS阶段显示正常，但是当起到ubuntu操作系统时，无论图形或者命令行显示，都会出现上下两个相同的图形。ubuntu系统图形显示界面如附件图片，请问这个问题是怎么引起的，应该如何解决？

     Best  Regards！

[TomasVaverka]

Hi,

DP source (BIOS OS) uses correct EDID to output video in BIOS mode (BIOS setup screen), so that LCD panel has correct display on it.

When system enters into Ubuntu OS mode, then DP source (Ubuntu display driver) outputs incorrect video timing (looks like video pixel clock is too fast) to cause overlapped display on the LCD panel.

You need to find out what is the EDID used to output video (through PTN3460I) to the LCD panel in Ubuntu OS mode? It looks like that Ubuntu OS display driver may use internal built-in default EDID to output video to the LCD panel instead to read EDID from PTN3460I (like BIOS mode does).

Best regards,

Tomas