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From: James D Strandboge <>
To: Linux Kernel Mailing List <>
Subject: Polling /proc/apm causes usb hiccups and clock drift
Date: 24 Sep 2002 09:12:00 -0400	[thread overview]
Message-ID: <1032873120.3056.7.camel@sirius.strandboge.cxm> (raw)

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

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?


Jamie Strandboge

GPG/PGP ID:   26384A3A
Fingerprint:  D9FF DF4A 2D46 A353 A289  E8F5 AA75 DCBE 2638 4A3A

             reply	other threads:[~2002-09-24 13:06 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-09-24 13:12 James D Strandboge [this message]
     [not found] ` <>
2002-09-25 12:39   ` James D Strandboge
2002-09-25  9:48 Thomas Hood

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