I've installed CentOS 5.5, fixed my problems with my network card driver, and and I've followed this: http://wiki.centos.org/AdditionalResources/HardwareList/AtiDriver , downladed latest ati driver, restarted, screen resolution is fixed, but everything lags.
ATI Radeon HD 5470 1GB
this is the output of "lspci -v"
*01:00.0 VGA compatible controller: ATI Technologies Inc Manhattan [Mobility Radeon HD 5000 Series] (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Unknown device 1bf2 Flags: bus master, fast devsel, latency 0, IRQ 11 Memory at c0000000 (64-bit, prefetchable) [size=256M] Memory at d0020000 (64-bit, non-prefetchable) [size=128K] I/O ports at d000 [size=256] Expansion ROM at d0000000 [disabled] [size=128K] Capabilities: <access denied> *