Me and Alex talked to a BIOS guys yesterday exactly about that, a dynamic way to query this info from BIOS, he just told us to reserve 32M to cover 4K display. Andrey On 04/06/2018 04:30 AM, Christian König wrote: >> I wonder if there's no way to determine which part of VRAM is being >> scanned out. If there was, we could just create a normal BO covering >> that, which would get destroyed once no CRTC references it anymore. > > Unfortunately it goes further than that. The stolen VRAM is needed for > VGA emulation, not only for scanout. > > But yes I agree that we somehow figure that value out from the BIOS. > If I'm not completely mistaken I've also seen some atombios table with > that info in some discussion. > > Christian. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://lists.freedesktop.org/archives/amd-gfx/attachments/20180406/a353c65d/attachment-0001.html>
