i830 agpgart oddities

Hello,

does anyone have an idea about following odd reset?

I've tried suspend-to-disk. If I'm using agpgart and X server then resume simply resets whole system (no oops).
If I change resume so that it restores pages from higher addresses to lower then it is all ok.
If I start restoring at 0xc0000000 and ending at 0xcee00000 then it resets at about 0xcb8ab000. If I start restoring at 0xcee00000 down to 0xc0000000 then it is ok and system is back ok as well.

I have no idea why it depends on order of pages while interrupts are disabled and I'm only copying memory pages.

Lukáš Hejtmánek