https://bugs.freedesktop.org/show_bug.cgi?id=31122

--- Comment #13 from A. Chaud <nvbugz-ZdXa/xnzD07wXD0AkxfrAg@public.gmane.org> ---
Created attachment 125562
  --> https://bugs.freedesktop.org/attachment.cgi?id=125562&action=edit
backlight control w/ gpio check

Thanks for that tip. It was helpful.  

The rom in debugfs worked in nvbios and this patch has a gpio check.  It seems
to work but I've no idea whether or not this is correctly implemented.  

However, I still believe this is unnecessary as the main init function already
checks for LVDS and eDP.

I copied the GPIO table below for reference:

GPIO table at 0x0ac3 version 1.0
GPIO 0: line 1 tag 0x08 [HPD_1] IN
GPIO 1: line 2 tag 0x00 [PANEL_BACKLIGHT_ON] OUT param 1
GPIO 2: line 3 tag 0x01 [PANEL_POWER] OUT
GPIO 3: line 4 tag 0x0c [TVDAC_0] OUT
GPIO 4: line 6 tag 0x13 [???] IN
GPIO 5: line 9 tag 0x0a [???] OUT

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