Activating EXA
Section "Device"
Identifier "mga"
Driver "mga"
Option "AccelMethod" "EXA"
Option "EXANoComposite" "True"
Option "EXANoDownloadFromScreen" "True"
Option "EXANoUploadToScreen" "True"
Endsection
makes it worse than normal software render.
It results in hanging X without disabling Compsite/DownloadFromScreen.
Disabling Composite, DownloadFromScreen results in fully corrupted
screen, disabling UploadToScreen helps a little, however screen is still
corrupted (moving a window over another leaves traces in the inactive
windows behind).
The remaining acceleration
[ 268.727] (**) MGA(0): EXA: Disabling Composite operation (RENDER
acceleration)
[ 268.727] (**) MGA(0): EXA: Disabling UploadToScreen
[ 268.727] (**) MGA(0): EXA: Disabling DownloadFromScreen
[ 268.727] (II) EXA(0): Offscreen pixmap area of 8474624 bytes
[ 268.727] (II) EXA(0): Driver registered support for the following
operations:
[ 268.727] (II) Solid
[ 268.727] (II) Copy
[ 268.727] (==) MGA(0): Backing store enabled
is just as slow as normal render => EXA + matrox card is not usable
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https://bugs.launchpad.net/bugs/1316035
Title:
matrox g200eR2 is unclaimed in 14.04
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