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Date:      Thu, 29 Jan 2009 16:39:32 +0000
From:      Mark Knight <markk@knigma.org>
To:        freebsd-x11@freebsd.org
Subject:   Re: Xorg 7.4 breaks mga with G450
Message-ID:  <IoupDdQEvdgJFwsM@lap.knigma.org>
In-Reply-To: <1233245396.1766.13.camel@wombat.2hip.net>
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> <K+CJGqO1AcgJFwci@lap.knigma.org> <1233244386.1766.1.camel@wombat.2hip.net> <R$3fWbPhHdgJFwuz@lap.knigma.org> <X$TeWyPxLdgJFwvR@lap.knigma.org> <1233245396.1766.13.camel@wombat.2hip.net>

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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/



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