On Sat, 29 Oct 2011 09:12:13 +0100, Chris Wilson <ch...@chris-wilson.co.uk> wrote: > On Sat, 29 Oct 2011 00:05:22 -0700, "Keith Packard" <kei...@keithp.com> wrote: > > * Constructing a fake drm_framebuffer is a pain; there are a million > > places that assume all kinds of things about the frame buffer on > > a crtc. > > This is vital as we need to capture the current GATT and stolen allocations > and preserve them across takeover. Otherwise we end up using the VBIOS > scanout PTEs as our ringbuffer and the actual memory for FBC.
Yeah, I'm getting quite the light show at present, could well be due to this. > Best case failure is garbage during takeover; worst case is a GPU hang. Sounds like creating a GEM object that maps stolen pages is not just a good idea, but actually necessary. With that and the mode detection, I think we'll be pretty much set then. The two patches I've got now are sufficient to get from boot through X only using mode_set_base, albeit with the screen transitioning through some pretty crazy looking stuff. -- keith.pack...@intel.com
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