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Old 05-07-2004, 07:46 PM   #1
GregLee
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How agp memory, stencil buffer for Intel i810 graphics


I think my i810 graphics chip is pretty nice, for the 0 extra it cost me -- it's on my motherboard. But there are a couple of frustrating things about it. First, with some games it runs out of texture memory. I'd like to give it some more system memory, but I don't know how. I have VideoRam set to 24600 in my XF86Config file, and that's as high as I can get it. Higher, and XFree86 aborts and complains it couldn't allocate agp memory. I think my agp aperture is 64M, so why can't I get more than 24.6? (Kernel bootup messages used to say the aperture was 64M, but after I installed extra memory, I no longer get messages about the aperture.) Maybe the i180 is already using some agp memory?

And second, whenever an SDL-based program asks for some bits of stencil buffer, it aborts, complaining that it can't find a matching glx visual. Yet glxinfo reports that I do have visuals available with 8 bits of stencil buffer. So why can't I use stencil buffer?

I'll be grateful for any suggestions.
 
Old 05-07-2004, 07:59 PM   #2
leonscape
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Stencil buffers could be a problem with the driver, or it can't allocate enough continuious memory for the buffers.

AGP apperture isn't the memory used bu the GFX chip (Its a shared memory thing, used by GFX cards with there own memory, through the AGP slot ), The memory actually taken for the GFX is a seprate setting. Look under chipset stuff in the bios to assign more memory to the GFX chip. ( You din't mention your motherboard so poke around. )

Last edited by leonscape; 05-07-2004 at 08:00 PM.
 
Old 05-07-2004, 08:15 PM   #3
GregLee
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Quote:
Originally posted by leonscape
AGP apperture isn't the memory used bu the GFX chip (Its a shared memory thing, used by GFX cards with there own memory, through the AGP slot ), ...
I suppose the way I put it did confuse the i810 chip and the X Windows i810 driver. But it's the driver that needs to allocate agp memory for various purposes (and it also runs out of room for textures). And I want to give it more. (The i810 is just a chip, not a card -- it doesn't have any memory of its own.)
 
Old 05-07-2004, 08:24 PM   #4
leonscape
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You can't do this dynamically. as I said

Quote:
The memory actually taken for the GFX is a seprate setting. Look under chipset stuff in the bios to assign more memory to the GFX chip. ( You din't mention your motherboard so poke around. )
Its allocated a boot by the BIOS. It will be under something like Graphics memory, usually under the chipset part.
 
Old 05-07-2004, 09:22 PM   #5
GregLee
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Quote:
Originally posted by leonscape
You can't do this dynamically. as I said ...
I'm just not understanding what you're saying. Can't do what dynamically? I asked about increasing the amount of AGP memory allocated by the driver. That's done dynamically. The driver reports on what it has allocated. Now, it says
Quote:
(II) I810(0): I810CheckAvailableMemory: 323512k available
(**) I810(0): Will alloc AGP framebuffer: 24600 kByte
...
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 8, (OK)
drmGetBusid returned ''
(II) I810(0): [drm] loaded kernel module for "i810" driver
(II) I810(0): [drm] created "i810" driver at busid "PCI:0:1:0"
(II) I810(0): [drm] added 8192 byte SAREA at 0xdcdf6000
(II) I810(0): [drm] mapped SAREA 0xdcdf6000 to 0x401ec000
(II) I810(0): [drm] framebuffer handle = 0xf8000000
(II) I810(0): [drm] added 1 reserved context for kernel
(II) I810(0): [drm] Registers = 0xf4000000
(II) I810(0): [agp] dcacheHandle : 0x0
(II) I810(0): [agp] GART: no dcache memory found
(II) I810(0): [agp] Bound backbuffer memory
(II) I810(0): [agp] Bound depthbuffer memory
(II) I810(0): GART: Allocated 7MB for HWMC
(II) I810(0): [agp] GART: Allocated 4K for mouse cursor image
(II) I810(0): Adding 384 scanlines for pixmap caching
(II) I810(0): Allocated Scratch Memory
My question was: why can it only allocate 24600K?

I understand that memory is also allocated for the i810 framebuffer at boot up. I don't see what good it would do me to change that.
 
Old 05-07-2004, 09:40 PM   #6
leonscape
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BIOS assigns to that chip it can have so much memory. I've never got it working dynamically with the i810. ( Ignore AGP for this its nothing to do with it ).

You can only do it dynamically with the 830M chips or later with the agp/agpart drivers. ( kernel settings ).

Increasing the Value in BIOS works for all chips.

The manual page is slightly confusing on the point. But this is how I got it working for my friend with this chipset. Setting values dynamically doesn't always work, it needs to be supported by the chip/BIOS/Kernel and driver to work.
 
  


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