well when Red Hat locked down development on RHEL6
Gnome2 WAS the default
so gnome 2 will still be in use on RHEL/CentOS/SL 6 for 5 more years
despite no real gnome support
CentOS like RHEL was designed for the server with NO desktop GUI installed
now CentOS dose ADD some "extras " for the desktop use
but LAPTOP support is almost nonexistent
most laptops work mostly well -- MOSTLY ,most of the time
if the LED is not working on a laptop
They might never work .
there might not be any way of truing on / off the LED's
RHEL/CentOS/SL on laptops IS a "crap shoot"
most things will mostly work most of the time
now you CAN look in the repos
EPEL and ELrpo or rpmforge
do a yum search
see the CentOS wiki on installing third party repos
see what is there
also over the years i have seen some config file hacks for some hardware
and seeing as RHEL/CentOS is a mostly manually configured OS
there might be some kernel or udev or int settings that can be set
-- off hand ? i do not know of any for a laptop .