Bug#414403: xserver-xorg-video-mga: Error detecting memory on g200e

[Brice Goglin <Brice.Goglin@ens-lyon.org>]

Stefanos Papanicolopulos wrote:
> I'm facing the same problem [in Ubuntu, actually]. I guess it is
> related to bad detection of Video RAM size:
>
>   (--) MGA(0): VideoRAM: 1696 kByte
>   ...
>   (II) MGA(0): VESA VBE Total Mem: 1664 kB
>
> You'll notice that 1024x768x16bpp = 1536kByte, which fits in the
> detected RAM, while 1024x768x24bpp = 2304 kByte, which doesn't fit.
>
> Actually, I don't know the real amount of video memory, but I would be
> very surprised if it were so little.

I didn't find the exact MGA G200e model, but all the G200 I found in
Matrox users guides have 8 MB (except the Millenium G200SD which has 16MB).

Also the lspci output seems to indicate 8 or 16MB I/O memory:
    Memory at ee000000 (32-bit, prefetchable) [size=16M]
    Memory at ef800000 (32-bit, non-prefetchable) [size=16K]
    Memory at ef000000 (32-bit, non-prefetchable) [size=8M]

Could you try increasing the memory to 4, 8 or 16MB in xorg.conf by
adding a VideoRam option in the Device section?

Brice