Xorg 7.4 breaks mga with G450

[Warren Block]

On Thu, 29 Jan 2009, Mark Knight wrote:

> In message <1233238588.1779.48.camel at wombat.2hip.net>, Robert Noland 
> <rnoland at FreeBSD.org> writes
>> Things that make you go Hrm...
>> 
>> (==) MGA(0): Min pixel clock is 12 MHz
>> (--) MGA(0): Max pixel clock is 1200 MHz
>
> Well this might make you go "Ha":
>
> This next log is from the same hardware that I'm now having trouble with Xorg 
> 7.4.
>
> Unfortunately it's a little older than I'd like since I don't backup /var/log 
> too often:
>
>  http://www.knigma.org.uk/scratch/xorg-good-mga-log.txt

Dual-head didn't work with that setup, did it?

> (--) MGA(0): BIOS at 0xFEAC0000
> Requesting insufficient memory window!: start: 0xfda00000 end: 0xfeafffff size 0x2000000
> (EE) Cannot find empty range to map base to
> (WW) MGA(0): Video BIOS info block not detected!

Without the video BIOS, the mga driver couldn't detect which card it 
was.  (I think, it's been a while.)

That was what my patch to xorg-server (1.4.x) fixed.  Or at least made 
work, by reading the video BIOS directly.

http://www.wonkity.com/~wblock/mgapatch/xorg-patch.txt
http://www.wonkity.com/~wblock/mgapatch/patch-Pci.c-WB

That's exactly where libpciaccess comes in.

-Warren Block * Rapid City, South Dakota USA