Are you using the open-source ATI driver or the proprietary fglrx driver? If
you are using the open-source driver, I notice that you have an ASUS M2V-MX
motherboard with a VIA chipset, so you may be encoubntering the problem
described at http://choon.net/forum/read.php?21,106131,115940
This problem has been fixed upstream in kernel 3.0-rc3 and the fix has also
been cc'd to the stable kernel tree. From the changelog:
commit 62fff811d73095bd95579d72f558f03c78f7914a
Author: Daniel Haid
Date: Wed Jun 8 20:04:45 2011 +1000
drm/radeon/kms: fix for radeon on systems >4GB without hardware iommu
On my x86_64 system with >4GB of ram and swiotlb instead of
a hardware iommu (because I have a VIA chipset), the call
to pci_set_dma_mask (see below) with 40bits returns an error.
But it seems that the radeon driver is designed to have
need_dma32 = true exactly if pci_set_dma_mask is called
with 32 bits and false if it is called with 40 bits.
I have read somewhere that the default are 32 bits. So if the
call fails I suppose that need_dma32 should be set to true.
And indeed the patch fixes the problem I have had before
and which I had described here:
http://choon.net/forum/read.php?21,106131,115940
Acked-by: Alex Deucher
cc: [email protected]
Signed-off-by: Dave Airlie
A PPA of the 3.0-rc3 kernel is available at http://kernel.ubuntu.com
/~kernel-ppa/mainline/
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https://bugs.launchpad.net/bugs/756540
Title:
ATI graphics card fails when RAM increased to 4Gb on Natty Beta
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