[ILUG] X only seeing 1mb mem on a 4mb vid card

[Kevin O' Riordan]

hi all,

I've been beating my aching head off this for ages now, basically the
subject says it all.  Basically, I have two ati cards in the box, an agp
and a pci, both 4mb.  For some reason though, only 1mb on the pci card
gets recognised by X.  The "VideoRam  4096" directive seems to be
ignored silently ...

Does anyone know of a good way of forcing X to ignore it's better
judgement and use a user-specified amount of RAM ?  Or better yet, would
anyone know why X detects it wrongly in the first place ?

As a side note, the card works fine at home, though I can't think what
differences would be relevant ... both boxes use kernel 2.4.17, and only
slightly differing versions of X, 4.1.0 & 4.1.x.  Can anyone think what
differences are particularly likely to be important ?


The relevant lines (I think) in XF86Config are:

	Section "Device"
		Identifier	"ati_kev"
		Driver		"ati"
		VendorName	"ATI"
		BoardName	"Mach64 GU"
		ChipSet		"ati"
		ChipId		0x4755
		ChipRev		0x9a
		VideoRam	4096
		BusId		"PCI:0:14:0"
	EndSection


and the irritating bits from /var/log/XFree.0.log:

	(--) PCI: (0:14:0) ATI Mach64 GU rev 154, Mem @ 0x42000000/24, 0x40300000/12
	
and further down in that log:

	(II) ATI: ATI driver (version 6.3.6) for chipsets: ati, ativga
	(II) ATI:  Candidate "Device" section "ATI Mach64".
	(II) ATI:  Candidate "Device" section "ati_kev".
	(II) ATI:  Shared PCI/AGP Mach64 in slot 0:13:0 detected.
	(II) ATI:  Shared PCI/AGP Mach64 in slot 1:0:0 detected.
	(II) ATI:  Shared PCI/AGP Mach64 in slot 1:0:0 assigned to active "Device" section "ATI Mach64".
	(II) ATI:  Shared PCI/AGP Mach64 in slot 0:13:0 assigned to active "Device" section "ati_kev".

and further down again ...

	(==) ATI(1): Chipset:  "ati".
	(**) ATI(1): Depth 16, (--) framebuffer bpp 16
	(II) ATI(1): VESA BIOS detected
	(II) ATI(1): VESA VBE Version 2.0
=>	(II) ATI(1): VESA VBE Total Mem: 1024 kB
	(II) ATI(1): VESA VBE OEM: ATI MACH64
	


thanks in advance
-kev