GoogleEarth leads into "drmWaitVBlank returned -1" error

On my system (kubuntu 7.10 with an Radeon 9800 PRO using the open source ati driver) GoogleEarth reports "do_wait: drmWaitVBlank returned -1, IRQs don't seem to be working correctly.
Try running with LIBGL_THROTTLE_REFRESH and LIBL_SYNC_REFRESH unset."

xrandr --verbose tells me:
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 1280 x 1200
VGA-0 disconnected (normal left inverted right)
        Identifier: 0x4c
        Timestamp: -1042719901
        Subpixel: no subpixels
        Clones:
        CRTCs: 0 1
        load_detection: 1 (0x00000001) range: (0,1)
DVI-0 connected 1280x1024+0+0 (0x4f) normal (normal left inverted right) 376mm x 301mm
        Identifier: 0x4d
        Timestamp: -1042719901
        Subpixel: horizontal rgb
        Clones:
        CRTC: 0
        CRTCs: 0 1
        EDID_DATA:
                00ffffffffffff0009d10177ac050000
                0b11010380261e78eaa2a5a3574c9d25
                115054bdef80714f81908180818c454f
                614001010101302a009851002a403070
                1300782d1100001ed50980a0205e6310
                10605208782d1100001a000000fd0038
                4c1f530e000a202020202020000000fc
                0042656e51204650393347530a0a00bb
                dvi_monitor_type: auto
                scaler: off
                tmds_pll: bios
        load_detection: 0 (0x00000000) range: (0,1)
  1280x1024 (0x4f) 108.0MHz +HSync +VSync
        h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 64.0KHz
        v: height 1024 start 1025 end 1028 total 1066 clock 60.0Hz
  1280x1024 (0x50) 140.8MHz -HSync +VSync
        h: width 1280 start 1368 end 1504 total 1728 skew 0 clock 81.5KHz
        v: height 1024 start 1027 end 1034 total 1072 clock 76.0Hz
  1280x1024 (0x51) 135.0MHz +HSync +VSync
        h: width 1280 start 1296 end 1440 total 1688 skew 0 clock 80.0KHz
        v: height 1024 start 1025 end 1028 total 1066 clock 75.0Hz
  1280x1024 (0x52) 133.0MHz -HSync +VSync
        h: width 1280 start 1368 end 1504 total 1728 skew 0 clock 77.0KHz
        v: height 1024 start 1027 end 1034 total 1070 clock 71.9Hz
  1280x1024 (0x53) 109.0MHz -HSync +VSync
        h: width 1280 start 1368 end 1496 total 1712 skew 0 clock 63.7KHz
        v: height 1024 start 1027 end 1034 total 1063 clock 59.9Hz
  1152x864 (0x54) 108.0MHz +HSync +VSync
        h: width 1152 start 1216 end 1344 total 1600 skew 0 clock 67.5KHz
        v: height 864 start 865 end 868 total 900 clock 75.0Hz
  1152x864 (0x55) 104.0MHz -HSync +VSync
        h: width 1152 start 1224 end 1344 total 1536 skew 0 clock 67.7KHz
        v: height 864 start 867 end 871 total 905 clock 74.8Hz
  1024x768 (0x56) 78.8MHz +HSync +VSync
        h: width 1024 start 1040 end 1136 total 1312 skew 0 clock 60.1KHz
        v: height 768 start 769 end 772 total 800 clock 75.1Hz
  1024x768 (0x57) 75.0MHz -HSync -VSync
        h: width 1024 start 1048 end 1184 total 1328 skew 0 clock 56.5KHz
        v: height 768 start 771 end 777 total 806 clock 70.1Hz
  1024x768 (0x58) 65.0MHz -HSync -VSync
        h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.4KHz
        v: height 768 start 771 end 777 total 806 clock 60.0Hz
  1024x768 (0x59) 63.5MHz -HSync +VSync
        h: width 1024 start 1072 end 1176 total 1328 skew 0 clock 47.8KHz
        v: height 768 start 771 end 775 total 798 clock 59.9Hz
  832x624 (0x5a) 57.3MHz -HSync -VSync
        h: width 832 start 864 end 928 total 1152 skew 0 clock 49.7KHz
        v: height 624 start 625 end 628 total 667 clock 74.6Hz
  800x600 (0x5b) 50.0MHz +HSync +VSync
        h: width 800 start 856 end 976 total 1040 skew 0 clock 48.1KHz
        v: height 600 start 637 end 643 total 666 clock 72.2Hz
  800x600 (0x5c) 49.5MHz +HSync +VSync
        h: width 800 start 816 end 896 total 1056 skew 0 clock 46.9KHz
        v: height 600 start 601 end 604 total 625 clock 75.0Hz
  800x600 (0x5d) 49.0MHz -HSync +VSync
        h: width 800 start 840 end 920 total 1040 skew 0 clock 47.1KHz
        v: height 600 start 603 end 607 total 629 clock 74.9Hz
  800x600 (0x5e) 40.0MHz +HSync +VSync
        h: width 800 start 840 end 968 total 1056 skew 0 clock 37.9KHz
        v: height 600 start 601 end 605 total 628 clock 60.3Hz
  640x480 (0x5f) 31.5MHz -HSync -VSync
        h: width 640 start 656 end 720 total 840 skew 0 clock 37.5KHz
        v: height 480 start 481 end 484 total 500 clock 75.0Hz
  640x480 (0x60) 31.5MHz -HSync -VSync
        h: width 640 start 664 end 704 total 832 skew 0 clock 37.9KHz
        v: height 480 start 489 end 491 total 520 clock 72.8Hz
  640x480 (0x61) 30.2MHz -HSync -VSync
        h: width 640 start 704 end 768 total 864 skew 0 clock 35.0KHz
        v: height 480 start 483 end 486 total 525 clock 66.7Hz
  640x480 (0x62) 25.2MHz -HSync -VSync
        h: width 640 start 656 end 752 total 800 skew 0 clock 31.5KHz
        v: height 480 start 490 end 492 total 525 clock 60.0Hz
  720x400 (0x63) 28.3MHz -HSync +VSync
        h: width 720 start 738 end 846 total 900 skew 0 clock 31.5KHz
        v: height 400 start 412 end 414 total 449 clock 70.1Hz
  640x350 (0x64) 25.2MHz -HSync +VSync
        h: width 640 start 656 end 752 total 800 skew 0 clock 31.5KHz
        v: height 350 start 387 end 389 total 449 clock 70.1Hz
S-video disconnected (normal left inverted right)
        Identifier: 0x4e
        Timestamp: -1042719901
        Subpixel: no subpixels
        Clones:
        CRTCs: 0 1
                tv_standard: pal
        tv_vertical_position: 0 (0x00000000) range: (-5,5)
        tv_horizontal_position: 0 (0x00000000) range: (-5,5)
        tv_horizontal_size: 0 (0x00000000) range: (-5,5)
        load_detection: 0 (0x00000000) range: (0,1)

Attached you´ll find my xorg.conf and the xorg log.

If any more information is needed please let me know.

Florian