dri disabled on Etch / Xorg

["David E. Fox" <dfox@m206-157.dsl.tsoft.com>]

I'm running Etch, latest Xorg. 

DRI has been working fine for sometime, up until just recently. Seems
that it is disabled somehow, and I don't know how to get it back :(.

There is a line in my recent Xorg.0.log file:

dfox@m206-157:/var/log$ grep DRI Xorg.0.log
(II) Loading extension XFree86-DRI
(EE) MGA(0): [drm] DRIScreenInit failed.  Disabling DRI.

I'm using a Matrox G450 card.

There was a recent workaround that I employed during the transition
from Xorg 6.9 to 7.0, which also disabled DRI, but the following
workaround enabled it:

Section "Device"
        Identifier      "Matrox Graphics, Inc. MGA G450 AGP"
        Driver          "mga"
        BusID           "PCI:1:0:0"
        Option          "OldDmaInit"  "true"
EndSection

i.e., adding the line setting option oldDMAInit to true works around
the problem - and this sufficed for a while, but no longer. It doesn't
seem to make any difference now whether that option is set or unset.



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