[Intel-gfx] [PATCH] Use enable bit for LVDS detect

[Fu Michael]

Alexander E. Patrakov wrote:
> Wang, Zhenyu Z wrote:
>   
>> On 2008.11.21 13:28:44 +0800, Alexander E. Patrakov wrote:
>>     
>>> Not 100% sure. Some laptops use VGA as the primary display if started with the dock 
>>> connected and the lid closed. I will test this once you give me enough instructions 
>>> to tell the difference caused by your patch.
>>>       
>> oh, right just tested on T61 here, with VGA as primary display. So current driver
>> will still light up LVDS even it's disabled, but with this patch driver won't enable
>> it too. User will keep on with VGA primary display, and can only enable LVDS via reboot.
>> I'm not sure about the expected usage here.
>>     
>
> Sometimes, when I need extra space on the desktop (e.g., for things like auxiliary 
> GIMP windows such as "layers, channels and contours") I open the lid, run xrandr so 
> that the internal display becomes logically positioned left of the main monitor, and 
> move some windows there.
>
>   
Then we have to shoot for the LVDS enable bit definition in VBT directly 
then, there is one bit definition in the physically first block ( not 
block id == 1) for this purpose.  It'll reflect the machine builder's 
wish more accurately...