Xorg 7.4 breaks mga with G450

[Warren Block]

On Sun, 25 Jan 2009, Robert Noland wrote:

> On Sun, 2009-01-25 at 22:50 +0000, Mark Knight wrote:
>> Hi,
>>
>> I've been using the same PC with a Matrox G450 on AGP with a trusty old
>> iiyama CRT monitor (Vision Master pro 410) for years.  System is running
>> FreeBSD 6.4-RELEASE-p1
>>
>> Having just upgraded to Xorg 7.4 from 7.3 and following the instructions
>> in UPDATING I cannot get a stable picture.
>>
>> Using my stock xorg.conf (see below), or a brand new config version
>> created by "Xorg -configure" I get an extremely noisy (but stable) image
>> if I lower resultion from my normal 1280x1024 to 1027x768.  At the
>> standard resolution the monitor is unable to sync.
>>
>>    http://www.knigma.org.uk/scratch/Xorg.0.log
>>    http://www.knigma.org.uk/scratch/xorg.conf
>>
>> I've tried with and without DDC and with and without
>> HorizSync/VertRefresh and with and without SyncOnGreen (my monitor has
>> always product a slightly sharper picture with the latter).
>>
>> Any ideas?
>
> I think your on the right track... It sounds like the mode calculation
> is off...  I won't have access to mga hardware before next weekend, but
> even then mine is connected to a panel.

My G450 does the same (sync problem/noisy picture) on an LCD. 
mga-1.4.9 does it too, so I'd suspect a change in xorg-server.

Resolutions other than 1024x768 come up as 1024x768 anyway.  That could 
be the monitor trying to be smart.  Sample log and xorg.conf at:

http://www.wonkity.com/~wblock/mga

-Warren Block * Rapid City, South Dakota USA