I installed Debian w/ LXDE and Lubuntu on my Thinkpad T41 laptop a while ago. I have since decided that I despise LXDE. There is poor integration or availability of features. No convenient way to add to keyboard layout among many others, for e.g. Also, the neglect of all the flaws by the devs.
But, one of my biggest issues has been other minor but really annoying quirks. Such as the scrollbar in my browsers. I can barely see them and I did try to change my brightness settings but it didn't help. LXDE is the most overrated, useless DE to come out, definitely.
There is little change in the features and as XFCE, KDE and Gnome are constantly changing and evolving, LXDE stays static and at a most primitive state.
I would re-install a different DE but my laptop has other problems (hardware). I'll be considering it, though. I have since lost my Lubuntu install (for whatever reason, once it loads, it's just a blue screen with the logo). I don't get the fanfare that comes with LXDE. It's one thing to be a low resources DE (which can be had with XFCE, openbox, fluxbox, Enlightenment etc.) but another when it's completely useless and lacks features.
Hopefully, DEs like XFCE can become more efficent but not lose the useful features that it offers.