Polling /proc/apm causes usb hiccups and clock drift

From: James D Strandboge (jstrand1@rochester.rr.com)
Date: Tue Sep 24 2002 - 08:12:00 EST

I recently purchased a usb webcam and found that polling /proc/apm
causes the webcam in xawtv to skip. I can do this either by doing 'cat
/proc/apm' or using the gnome battstat-applet. Syslog says:

Sep 23 10:14:17 sirius kernel: usb-uhci.c: iso_find_start: gap in
seamless isochronous scheduling
Sep 23 10:14:18 sirius kernel: quickcam: too little data by 48260
Sep 23 10:14:18 sirius kernel: quickcam: failed qc_imag_convert()=-90

Disabling the battstat-applet and not touching /proc/apm lets xawtv work
fine without the above errors. Polling /proc/apm also causes clock
drift.

I have a Dell Inspiron 8200 laptop (1.6Ghz Pentium 4). Using kernel
2.4.18-686 from debian. I read that this happened to people in the 2.2
series. Is this a kernel apm bug or BIOS problem? Do I just have to
live with it?

Thanks,

Jamie Strandboge 

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This archive was generated by hypermail 2b29 : Mon Sep 30 2002 - 22:00:18 EST