x1950 only 256mb ram accessible

Alex Deucher alexdeucher at gmail.com
Mon Dec 21 07:07:40 PST 2009

On Sun, Dec 20, 2009 at 9:55 AM, Andrew Lyon <andrew.lyon at gmail.com> wrote:
> On Fri, Dec 18, 2009 at 3:41 PM, Jerome Glisse <glisse at freedesktop.org> wrote:
>> 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.
>> Cheers,
>> Jerome
> I tried to get kms working with xf86-video-ati and acceleration,
> according to the log X started ok but no output was displayed, a
> sudden burst of kernel errors were logged and a few seconds after
> starting X the system locked up.

Please file a bug and attach your xorg log and dmesg and list the
versions you are using:


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