Mailinglist Archive: radeonhd (265 mails)

[Kunal Gangakhedkar <kunal.gangakhedkar@xxxxxxxxx>]

On Tuesday 03 Nov 2009 8:38:55 pm Alex Deucher wrote:
> On Tue, Nov 3, 2009 at 10:00 AM, Kunal Gangakhedkar
> <kunal.gangakhedkar@xxxxxxxxx> wrote:
> > Hi,
> >
> > Sorry for not using word-wrap - so that the logs don't look messed up.
> >
> > I recently bought an HP Pavilion dv6 series laptop which comes with 
> > Mobility Radeon HD 4650 graphics chip with 1GB GDD3 VRAM.
> > It seems to be common with the dv6 series laptops from HP.
> >
> > The basic radeonhd X driver with the mainline radeon GPU driver gives me 
> > pretty nice X environment.
> > However, there are two issues that I'd like to know more about:
> >
> > 1.
> > the X.org logs show that the entire VRAM is not being used - instead only 
> > 256M out of the 1G are being used.
> >
> > The msg from Xorg.log is:
> > (II) RADEONHD(0): The detected amount of videoram exceeds the PCI BAR 
> > aperture.
> > (II) RADEONHD(0): Using only 262144kB of the total 1048576kB.
> > (--) RADEONHD(0): VideoRAM: 262144 kByte
> >
> > I'm attaching gzipped Xorg.0.log with this mail.
> > Even the lspci output (included below) says that the memory is 256M
> > whereas ATi catalyst driver in pre-installed Windows Vista Home Premium 
> > shows and uses full 1GB of VRAM.
>
> 256 MB is the max PCI aperture size.  that's the largest amount the
> CPU can access.  The GPU, however, can access the entire amount.
> Support for using the extended memory will come eventually with kms.

But, shouldn't the X driver (xserver-xorg-video-radeonhd) report it correctly 
in Xorg.0.log?
Isn't that what drives the GPU (via the kernel-mode radeon drm driver)?
Just curious..

I'm not a graphics guy, so, I could be wrong. :)

Thanks,
Kunal
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