Re: firewire issue when running dvswitch/dvgrab
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From: Clemens L. <cl...@la...> - 2014-12-02 18:35:00
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Erwann Thoraval wrote: > firewire_ohci: DMA context IR0 has stopped, error code: evt_descriptor_read This message means that the controller tried to read something from main memory, but failed. Complete memory read failures are not really possible, so the most likely cause is that the response from the memory controller was not received fast enough. > After this error, the computer usually freezes for about 5 minutes and > then comes back to life. Strange. Any other messages in the system log when this happens? > Finally, on more information i've discovered this morning: these issues > happens when the laptop is on battery. Until now, i don't face any issue > when plugged to AC. It might be possible that the CPU goes into a deeper sleep mode when on battery, and takes longer to wake up and serve DMA requests. > I tried to turn on debugging messages: > ... no crashes anymore! (except filling debug files, it works like a > charm for hours) <- that is what i wrote to dvswitch-devel ML, but it > eventually crashes, much more lately though. If the CPU has more work, it goes to sleep less often. Could you try to disable CPU frequency switching? Regards, Clemens |