Solved partialy, changing fglrx driver with radeon driver (all reported bugs disappearing). However, changing open ATI proprietary drivers with open source counter part eliminate some bugs, but introduce other.
ATI proprietary drivers (tested versions <= 8.35.5- i386) doesn't like xserver-xorg-core ver 1.2.99.905-2, just 1.3. This is not a release canditate version ? What (so big) differences can be between 1.2.99 and 1.3 ?
From https://a248.e.akamai.net/f/674/9206/0/www2.ati.com/drivers/linux/linux_8.33.6.html
X.Org 7.2 Support This release of the ATI Catalyst™ Linux software driver provides support for the offical X.Org 7.2 release. The previous release (8.32.5) supported the X Org 7.2 RC2 release only.
