Not sure what is causing your problem, but it might be worth you trying 3.4f instead of 3.4e.
You can see the spec. of my Acer laptop in my signature below and, without looking up the spec. of yours, one obvious difference between the two is that yours has an NVIDIA GPU rather than an ATI GPU. So perhaps you could also search the SL Forum and the Gentoo Forums for threads about NVIDIA driver problems relating to your specific model of GPU, in case the cause is GPU-related.
Some other things to look at are the output of the dmesg command and the contents of /var/log/Xorg.0.log to see if there are any error messages.
By the way, have you cleaned up /etc/make.conf file to remove all the stuff that does not relate to your laptop? Have a look at the following thread from some initial pointers:viewtopic.php?f=54&t=12239#p69905