Ati X700 - Sekani pri prehravani videa v X

Ahoj,
pri prehravani videa (zkousel sem v mplayeru tak xine) mi obraz priblizne kazdejch 5 sekund lagne a pokracuje jako by se nic nestalo.
Tento problem nenastava ve framebufferu, ktery bezi na vesa driveru

Graficka karta: ati X700
Ovladac: 8.22.5 (problem existuje i s pouzitim 8.23.7)
Xorg 7.0
Kernel Gentoo-2.6.16-r6
/etc/xorg.conf:


Section "Device"
#       Option "UseInternalAGPGART" "yes"
#       Option  "OpenGLOverlay" "on"
    Option "DesktopSetup"               "Single"
#       Option  "VideoOverlay"          "on"
#       Option  "BlockSignalsOnLock"    "on"
#       Option  "ForceGenericGPU"       "no"
#       Option  "StereoSyncEnable"      "1"
#       Option      "backingstore" "true"
#       Option  "VideoRAM"      "128000"
 #       Option      "FSAAEnable"                "on"
  #      Option      "FSAAScale"                 "1"
        Identifier  "X700"
        Driver      "fglrx"
        Option      "MonitorLayour" "TMDS, NONE"
#       Option "NoDDC"
        Option      "no_accel" "no"
        Option      "no_dri" "no"
#       Option  "mttr"          "off"
        Option      "ForceMonitors" "notv"
#       Option  "ScreenOverleap"        "0"
    Option "GammaCorrectionI"           "0x00000000"
    Option "GammaCorrectionII"          "0x00000000"
        Option      "Capabilities" "0x00000000"
#       Option  "CapabillitiesEx"       "0x00000000"
        Option      "UseFastTLS" "on"
#       Option  "Stereo"                "off"
        Option      "FSAADisableGamma" "on"
        Option      "FSAACustomizeMSPos" "no"
        Option      "FSAAMSPosX0" "0.000000"
        Option      "FSAAMSPosY0" "0.000000"
        Option      "FSAAMSPosX1" "0.000000"
        Option      "FSAAMSPosY1" "0.000000"
        Option      "FSAAMSPosX2" "0.000000"
        Option      "FSAAMSPosY2" "0.000000"
        Option      "FSAAMSPosX3" "0.000000"
        Option      "FSAAMSPosY3" "0.000000"
        Option      "FSAAMSPosX4" "0.000000"
        Option      "FSAAMSPosY4" "0.000000"
        Option      "FSAAMSPosX5" "0.000000"
        Option      "FSAAMSPosY5" "0.000000"
        Option      "FSAAScale" "0"
        Option      "FSAAEnable" "off"
        Option      "Centermode" "off"
        Option      "DesktopSetup" "horizontal"
        Option      "Stereo" "off"
        Option      "BlockSignalsOnLock" "on"
        BusID       "PCI:1:0:0"
        Option  "EnablePageFlip"        "1"
        Option  "AGPFastWrite"          "1"
EndSection

glxinfo |head -n 5


name of display: :0.0
display: :0  screen: 0
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.2

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Dotaz: Ati X700 - Sekani pri prehravani videa v X