[solved] xpdf, back light and fast
 

[EDIT]
I'm afraid... this trick, worked only for a couple of hours. I can't explain why xpdf was working well...
[/EDIT]

--- the following text, will NOT SOLVE the problem ---


I've just found the final solution, at least for me.
This morning I've been working with many pdf files, and I was getting tired of xpdf problems...
So, after 15 minutes of damned work I decided my self to solve this issue.

From an ftp mirror site of Slackware, download (wget) the whole xpdf source directory
Now, use the "xpdf.Slackbuild" to compile and create the package just like the official way.

Remove the installed xpdf and install the file "/tmp/xpdf-3.02pl6-i486-3.txz"

...xpdf will no longer eat and stress the cpu.

My system:
slackware 13.37 (32 bit) out-of-the-box
notebook acer travelmate 800lci

Try that solution.

That patch, works well.
Great suggestion!. Thanks.

You're welcome!