I have Debian Squeeze installed on an ASUS EeePC 901, using the i915 video drivers and linux-image-3.2.0-0.bpo.2-686-pae from squeeze- backports. If I dim the display using the KDE power gadget a lot, or allow it to dim automatically due to low battery, it dim suddenly to a barely perceivable level and I can not restore the display to full brightness without rebooting except for a brief flicker when the display is switched off.