I think it's not useful though. Think about that, SG display feature is 
intended to use as less VRAM as possible. Will someone want a display buffer 
sometimes VRAM, sometimes GTT?
Hardly a case to me, and I think it's a waste of effort. That also might 
explain no driver does that now.

Sam



On 2018-03-07 12:50 PM, Michel Dänzer wrote:
> On 2018-03-07 06:38 PM, Alex Deucher wrote:
>> On Wed, Mar 7, 2018 at 12:29 PM, Samuel Li <samuel...@amd.com> wrote:
>>>
>>> Why so complicated? If old user space compatibility is required, just use 
>>> sg_display=0.
>>
>> It will always just work in that case and we can adjust for the
>> optimal scenario by default in all cases without requiring the user to
>> set misc parameters to tune their setup that may break in the future
>> or hide bugs because a user sets it and forgets it.
> 
> Right. I don't agree it's all that complicated anyway, we do this sort
> of thing all the time, it also makes our lives easier down the road.
> 
> 
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