Re: Video issues with T42 running Etch and more
for thinkpads and linux there is really good site..
On Don, 01 Feb 2007, justin joseph wrote:
> Have now come up against a stone wall and need help. The video card
> on this machine is a ATI Technologies Inc Radeon Mobility M7 LW
> [Radeon Mobility 7500]. X is working but I don't think its working
> the way it should.
> I am unable to find from google, why lspci says that this card is
> 128MB whereas it is 32MB.
this is only the memory area use by your card.
your cpu is capable to address at least 4gb of ram, and a physicall devices
grab just some of the addresses so the cpu can work with them.
512mb are grabbed by your system memory
and every pci device takes some memory
> justin@thinkpad:~$ free -m
> total used free shared buffers cached
> Mem: 504 230 273 0 8 96
> -/+ buffers/cache: 125 379
> Swap: 1011 0 1011
> I see that there is only 504MB of ram where as it must have been 512.
> where has the rest 8mb gone? I understand that this happens only when
> its shared by the VGA controller and in this case why would the VGA
> controller share it because its got 32 MB of vram.
i bet 8mb are lost because auf AGP, the agpgart driver in linux by default
grabs 8mb of memory.
> I can provide the full lspci output if required and would be nice if
> someone could send me an xorg.conf which fully utilizes this system.
as above .. take a look to thinkwiki
> on the sidelines, I were wondering why *most* of the subsystems on
> this T42 shows up as R50e on the lspci output. It that usual or has
> Lenovo conned me into purchasing R50e machine with just T42 name with
> better lid material.
lspci just reads the PCI IDs of your devices, then uses some sort of databae
to print _you_ a human readable device name. So don't take the text displayed