escreve glxgears no terminal e escreve aqui a saida
qual o chipset da tua máquina?
chipset NVIDIA GeForce 8400M GS
executei glxgears, depois de aproximadamente 1,5 minutos finalizei a operação
Running synchronized to the vertical refresh. The framerate should be
approximately the same as the monitor refresh rate.
14268 frames in 5.0 seconds
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13968 frames in 5.0 seconds
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14151 frames in 5.0 seconds
XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0.0"
after 52 requests (52 known processed) with 0 events remaining.