Created attachment 105306 [details]
Xorg.log

some messages from Xorg.log:

[    24.729] (--) RADEON(0): Chipset: "ATI RS740" (ChipID = 0x796e)
[    24.729] (II) RADEON(0): GPU accel disabled or not working, using shadowfb
for KMS

[    24.869] (WW) RADEON(0): Direct rendering disabled
[    24.869] (II) RADEON(0): Acceleration disabled

[    24.871] (WW) RADEON(0): Option "AccelMethod" is not used

[    24.879] (II) AIGLX: Screen 0 is not DRI2 capable
[    24.879] (EE) AIGLX: reverting to software rendering
[    25.578] (II) AIGLX: Loaded and initialized swrast
[    25.578] (II) GLX: Initialized DRISWRAST GL provider for screen 0