x1950 only 256mb ram accessible

Jerome Glisse glisse at freedesktop.org
Fri Dec 18 07:41:10 PST 2009

On Fri, Dec 18, 2009 at 08:42:19AM +0000, Andrew Lyon wrote:
> Hi,
> Running X server with Radeon x1950 and xf86-video-ati-6.12.4
> on kernel 2.6.31 the driver is reporting that only 256mb ram is
> accessible because that is the pci bar setting:
> (II) RADEON(0): Generation 2 PCI interface, using max accessible memory
> (II) RADEON(0): Detected total video RAM=524288K, accessible=262144K
> (PCI BAR=262144K)
> (--) RADEON(0): Mapped VideoRAM: 262144 kByte (256 bit DDR SDRAM)
> How can I use all 512mb?
> Full X log:
We don't support yet using full vram. Anyway i don't think we have
driver than can take advantage of all the memory so using 256M or
512M shouldn't impact your use for the time being.

This issue is being worked on in KMS world.


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