I use xorg-edgers/ppa/ubuntu for testing intel graphic driver. After todays snapshot xorg went to some restart loop on thinkpad t43 with gm915. Installing old driver fix this issue. latest working commit: ed8a9a94e1a670ca35311c9ed83d0c479530d41a current commit: a1e6abb5ca89d699144d10fdc4309b3b78f2f7a9