fc20 gnome windows random banging

[Randolph Jones]

asus mb with Radeon HD onboard card

lsmod gives

radeon               1157862  3 
i2c_algo_bit           13065  1 radeon
drm_kms_helper         44716  1 radeon
ttm                    68283  1 radeon
drm                   230162  5 ttm,drm_kms_helper,radeon

Xorg log says no screen section in in xorg.conf.d

11.629] Kernel command line:
BOOT_IMAGE=/boot/vmlinuz-3.11.10-301.fc20.i686+PAE
root=UUID=0144f7f6-912c-4e91-98bb-6b07ceaf3881 ro
vconsole.font=latarcyrheb-sun16 rhgb quiet LANG=en_US.UTF-8

TIA
rfjones