Hello,

reading in different forums I get more and more the idea that the IOMMU
implementation in the GART driver is to blame.

To get back all your memory you can try  the kernel option "iommu=soft"
which forces a software emulated IOMMU to take over instead the AMD64
hardware IOMMU. Different people reported that this also fixes the
problem without limiting the RAM. Btw. this is the default if you are
using an Intel IA64 because this CPU has no hardware IOMMU.

-- 
Hardy -- Suspend RUINS FILESYSTEM
https://bugs.launchpad.net/bugs/203537
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