ubuntu-x-swat team mailing list archive

[Peter <perivol@xxxxxxxxx>]

I have resolved the problem after comparing the 8.04 LTS and 10.04 LTS
Xorg.0.log files. Under 8.04 LTS the MGA driver was defaulting to

(**) MGA(0): Depth 16, (--) framebuffer bpp 16

Under 10.04 LTS it is defaulting to

(**) MGA(0): Depth 24, (--) framebuffer bpp 32

which is the cause of the bandwidth problem.  Setting "DefaultFbBpp 24"
in the "Screen" section of xorg.conf enables the 1280x1024 mode, but all
screen operations are very slow. The combination of  "DefaultDepth  16"
and  "DefaultFbBpp 16" provides completely acceptable performance which
is, in fact, a bit faster than under 8.04 LTS.

-- 
Missing display resolutions (too much memory bandwidth)
https://bugs.launchpad.net/bugs/469640
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