I have installed M4 onto an XP-era laptop, with an ATi Radeon Mobility X600 graphics chip, using the KDE desktop. All appeared to be well and working until the screensaver cut in. One image was displayed (I don't think it managed a change at all) then the screen went black. I could not find any way out of the situation apart from forcibly powering down.
I'd really appreciate some hints as to what I should check. There doesn't seem to be anything obvious in Display settings or Power settings.
AnneW