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Date: Tue, 29 Mar 2011 06:06:53 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: "Daniel O'Connor" <darius@dons.net.au>
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	(wonkity.com [127.0.0.1]); Tue, 29 Mar 2011 06:06:53 -0600 (MDT)
Cc: freebsd-x11@freebsd.org
Subject: Re: 1920x1080 resolution with mga driver
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On Tue, 29 Mar 2011, Daniel O'Connor wrote:

> Has anyone had any success doing this?
> I am trying to connect a Supermicro X8SIL-F which has an onboard mga :-
> (--) PCI:*(0:6:3:0) 102b:0532:15d9:0605 Matrox Graphics, Inc. MGA G200eW WPCM450 rev 10, Mem @ 0xfa000000/16777216, 0xfb7fc000/16384, 0xfb800000/8388608, BIOS @ 0x????????/65536
>
> to a BenQ which can do 1920x1080.
>
> Unfortunately I get the following..
> [snip]
> (II) MGA(0): Not using driver mode "1920x1080" (width too large for virtual size)
> (II) MGA(0): Not using driver mode "1280x1024" (mode requires too much memory bandwidth)
> (II) MGA(0): Not using driver mode "1600x900" (width too large for virtual size)
> (II) MGA(0): Not using driver mode "1680x1050" (width too large for virtual size)
> (II) MGA(0): Not using driver mode "1920x1080" (width too large for virtual size)
> (WW) MGA(0): Shrinking virtual size estimate from 1920x1080 to 1280x1024
> (--) MGA(0): Has SDRAM
> (--) MGA(0): Virtual size is 1280x1024 (pitch 1280)

How much video memory is available?  And even if it's more than 32M, try 
Depth 16.