Hit bound texture in upload

I'm getting a lot of 
 Hit bound texture in upload
in quake3. 

Whenever I get a message like this I also see corrupted textures on the
screen. From what I read in the source it appears this happens when mmAllocMem
returns 0 which sounds like it means out of memory. But I think I have plenty
of memory available. I know I have plenty of swap available.

Is this a known problem? On google I see a few other mentions of people
reporting this but nobody working on fixing it.

01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G400 AGP (rev 04) (prog-if 00 [VGA])
	Subsystem: Matrox Graphics, Inc. Millennium G400 16Mb SDRAM

From /u6/src/xfree86/xc/lib/GL/mesa/src/drv/mga/mgatexmem.c:

int mgaUploadTexImages( mgaContextPtr mmesa, mgaTextureObjectPtr t )
...
	 t->MemBlock = mmAllocMem( mmesa->texHeap[heap],
				   t->totalSize,
				   6, 0 );
	 if (t->MemBlock)
	    break;

	 if (mmesa->TexObjList[heap].prev->bound) {
	    fprintf(stderr, "Hit bound texture in upload\n");
	    return -1;
	 }





-- 
greg