MacBook Air dpc latency problem

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Level 1

10 points

MacBook Air dpc latency problem

My MacBook Air (2x 2.86 GHz, 128 GB SSD) has poor dpc latency values, prohibiting, e.g., recording of DAB (digital audio broadcast). The problem would seem to be caused by the "too slow" USB drivers. I wonder, whether there is a remedy for this available? For details related to dpc latency see

http://www.thesycon.de/deu/latency_check.shtml

PS: Elgato apparently does not provide software/drivers for recording DAB. So switching to Mac OS on my machine does not help. 😟

Siggi Engelbrecht

MacBook Air & Pro, Windows XP

Posted on May 15, 2009 12:21 AM

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Answer 1

T1mur

Level 1

55 points

May 21, 2009 2:31 AM in response to sev-engel

Have a look at this thread:

http://discussions.apple.com/thread.jspa?threadID=1876027&tstart=15

The worst culprit among others regarding DPC Latencies is Apple's KBDMGR.EXE driver. Read through the thread and have a look at the solutions. There's also a link to a script to help with KBDMGR.EXE there. 😉

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Answer 2

sev-engel Author

Level 1

10 points

May 26, 2009 8:50 AM in response to T1mur

Hallo T1MUR,

vielen Dank für den Hinweis. Hat's gebracht! 🙂

Thanks a lot for that hint, I followed your suggestions and it worked just fine. The scripts you provided in my case all appear to just switch off KbdMgr.exe without leaving me with a lot of choices. I still have to figure out whether this behaviour can be improved by editing your batch files. For the time being it probably would suffice to kill the process in the windows task manager and to switch it on again if needed by double clicking it in the c:\programs\boot camp directory. One then has to reenable the function keys manually, whereas all other tunings affected by boot camp are kept. This is slightly inconvenient, but it's ok. The differences may be due to the fact that I am dealing with a MacBook Air, not a MacBook Pro.

Thanks again for your help, I really appreciated this.

Siggi Engelbrecht

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