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Date: Thu, 29 Jan 2009 16:39:32 +0000
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From: Mark Knight <markk@knigma.org>
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Subject: Re: Xorg 7.4 breaks mga with G450
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In message <1233245396.1766.13.camel@wombat.2hip.net>, Robert Noland 
<rnoland@FreeBSD.org> writes
>Ok, I'll try and have a look at the detection code... It's possible that
>this is somehow related to the switch to libpciaccess.

This patch fixes the problem for me in a horribly broken way:

>mkn@shrewd$ pwd
>/usr/ports/x11-drivers/xf86-video-mga/work/xf86-video-mga-1.9.100/src
>mkn@shrewd$ sudo diff -u mga_driver.c.orig mga_driver.c
>--- mga_driver.c.orig   2009-01-29 16:31:42.000000000 +0000
>+++ mga_driver.c        2009-01-29 16:35:01.000000000 +0000
>@@ -1473,8 +1473,7 @@
>        xf86ErrorF("\n");
>     }
>
>-    pMga->is_Gx50 = ((pMga->Chipset == PCI_CHIP_MGAG400) && 
>(pMga->ChipRev >= 0x80))
>-       || (pMga->Chipset == PCI_CHIP_MGAG550);
>+    pMga->is_Gx50 = 1;
>     pMga->is_G200SE = (pMga->Chipset == PCI_CHIP_MGAG200_SE_A_PCI)
>        || (pMga->Chipset == PCI_CHIP_MGAG200_SE_B_PCI);

So the cause is clear but finding the bug is way beyond me...

Cheers,
-- 
Mark A. R. Knight                               finger: markk@knigma.org
Tel: +44 7880 556751                            http://www.knigma.org/