Bug#443936: xserver-xorg-video-mga: windowmaker and 1.9.99 get along terribly

[Brice Goglin <Brice.Goglin@ens-lyon.org>]

kls wrote:
> The previously observed abysmal 2d performance seems to be triggered
> by WindowMaker. This does not seem to be a compositing problem,
> because it is identical regardless of whether I have DRI enabled or
> not. It also appears independent of number of active screens.
>
> All windows take approximately 1 sec / MPixel to draw on my computer
> (1GHz athlon)
>
> at least two dockapps dislike the environment:
>
> wmnet's window contents are drawn in the wrong place (upper right
> corner rather than in a window)
>
> wmxmms crashes with
> Gdk-ERROR **: BadMatch (invalid parameter attributes)
>   serial 139 error_code 8 request_code 62 minor_code 0
>
> I'd suggest this is a problem in 1.9.99 (as opposed to windowmaker)
> because it worked correctly with all older drivers. 
>   

I have pretty much no idea what to look at here. So I am CCing Tilman
(the upstream dev).

I didn't use WindowMaker recently so I don't have any idea what it looks
like these days. Do you have the same problem in you start an empty
session with something like "startx /usr/bin/xterm" ?

The problem could related to the acceleration architecture. You're using
the default right now (XAA). Does it help if you add:
    Option "NoAccel" "true"
to the Device section of your xorg.conf? It will disable XAA
acceleration completely.

Or maybe the new architecture EXA would be better (I don't know how good
it is in the mga driver so far). Does it help if you add
    Option "AccelMethod" "EXA"
instead of the above NoAccel line?

Brice