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Date:      Thu, 29 Jan 2009 11:21:43 -0700 (MST)
From:      Warren Block <wblock@wonkity.com>
To:        Mark Knight <markk@knigma.org>
Cc:        freebsd-x11@freebsd.org
Subject:   Re: Xorg 7.4 breaks mga with G450
Message-ID:  <alpine.BSF.2.00.0901291115460.16894@wonkity.com>
In-Reply-To: <1532XLOh3bgJFwKw@lap.knigma.org>
References:  <+$PUWxC8yOfJFwC1@lap.knigma.org> <1232939280.1973.7.camel@wombat.2hip.net> <alpine.BSF.2.00.0901260943380.1030@wonkity.com> <1233002689.88679.24.camel@squirrel.corp.cox.com> <alpine.BSF.2.00.0901261613410.2383@wonkity.com> <1233197046.1779.11.camel@wombat.2hip.net> <alpine.BSF.2.00.0901282132460.13788@wonkity.com> <UGsOoZHOCWgJFw9E@lap.knigma.org> <1233234690.1779.20.camel@wombat.2hip.net> <u5Jw3MNZdbgJFwIn@lap.knigma.org> <1233238588.1779.48.camel@wombat.2hip.net> <1532XLOh3bgJFwKw@lap.knigma.org>

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On Thu, 29 Jan 2009, Mark Knight wrote:

> In message <1233238588.1779.48.camel@wombat.2hip.net>, Robert Noland 
> <rnoland@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



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