Red Hat Bugzilla – Bug 457205
X is hell slow if sisfb module is not loaded for sis x.org driver to use
Last modified: 2009-01-09 01:42:06 EST
Description of problem:
Cards using sis driver have awfully slow X. This is because vesafb and vga16fb
drivers prevent sisfb from being loaded, hence the X driver has no access to
better video memory management.
Version-Release number of selected component (if applicable):
Last reproduced in Fedora 8
Just install Fedora 5+ (iirc) in a video card that uses the sis driver and
-probably- needs the sisfb memory interface.
This can be fixed by blacklisting vesafb and vga16fb, and loading sisfb before
X. I made a human readable summary in my blog:
You can see more nasty details in the launchpad bug:
As mentioned there, this can't be fixed in Fedora unless you rebuild your kernel
because vesafb and vga16fb (honestly I don't recall which one) are/is not built
as modules like in Debian based systems, it's built-in.
The fix is just to make it a module and also build sisfb as a module.
In the worst case, if this doesn't sound that important, then please build sisfb
as a module (it's not loaded automatically ever, at least here on years using
debian/ubuntu/others) and make vga16fb (i think that's the one) a module too.
One more thing, as mentioned in the blog and the bug if you check for the
"benchmark" recorded by X on its log you'll see how having or not sisfb loaded
makes a difference.
That's all folks!
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