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[pvautrin <pvautrin@xxxxxxxxx>]

Pauli,

Unfortunately there's no such setting in my BIOS (GA-K8VM800M Rev1.x)

Now I'm confused about which memory area you are refering to.

iomem/ioports give the following memory areas (same in WinXP)

d0000000-dfffffff : PCI Bus 0000:01
  d0000000-dfffffff : 0000:01:00.0
    d0000000-dfffffff : radeon
e0000000-e3ffffff : GART
  e0000000-e3ffffff : aperture
e4000000-e5ffffff : PCI Bus 0000:01
  e4000000-e401ffff : 0000:01:00.0
  e5000000-e500ffff : 0000:01:00.0
    e5000000-e500ffff : radeon
  e5010000-e5013fff : 0000:01:00.1
    e5010000-e5013fff : ICH HD audio

03c0-03df : vga+
9000-9fff : PCI Bus 0000:01
  9000-90ff : 0000:01:00.0
    9000-90ff : radeon

And early in Xorg.0.log, I can see
(--) PCI:*(0@1:0:0) ATI Technologies Inc RV635 PRO AGP [Radeon HD 3650] rev 0, Mem @ 0xd0000000/268435456, 0xe5000000/65536, I/O @ 0x00009000/256, BIOS @ 0x????????/131072

So the 64M (e0000000-e3ffffff) is the AGP aperture, while the 256M (d0000000-dfffffff) is a different area that seems to be called video RAM or framebuffer according to these lines
(II) RADEON(0): Detected total video RAM=524288K, accessible=262144K (PCI BAR=262144K)
(II) RADEON(0): [drm] framebuffer handle = 0xd0000000

Nevertheless, you mention a conflict between agpgart and acpi, and the allocation error happens after "Using ACPI for IRQ routing", even with acpi=off option.
So does this mean the bug is in acpi? Can we point the relevant devs to this thread for comments/solution?

Thanks for your time

-- 
[HD3650] Kubuntu: garbage screen
https://bugs.launchpad.net/bugs/368187
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