USB Devices Not Detected and High CPU Usage

Hello, I'm using arch on a Dell 1720 laptop.
I have some weird issues involving detection of USB devices.
When the laptop is on battery and I plug in a USB mouse the power flickers on and flickers off again; nothing in the logs/dmesg.
If I then connect the AC adapter the reconnect the mouse, the same happens, except the CPU usage hits 87%+ on one core.
Running
sudo rmmod ehci_hcd
solves the problem; the CPU usage drops and the mouse gets detected.
Subsequent attempts to hotplug USB devices does nothing, no high CPU and no Power.
Rebooting the computer is the only way to use USB devices at the moment.
usb-autosuspend is disabled in laptop-mode.
uname -a:
Linux MatSalleh 2.6.39-ck #1 SMP PREEMPT Sun Jun 5 18:30:30 EDT 2011 x86_64 Intel(R) Core(TM)2 Duo CPU T7250 @ 2.00GHz GenuineIntel GNU/Linux
The same happens with the stock kernel too
My kernel line in grub:
kernel /vmlinuz26-ck root=/dev/sda3 elevator=bfq ro resume=/dev/sda2
Any ideas?
Thanks,
Chris.

lilsirecho wrote:Perhaps the USB connector is damaged, causing excess power drain suggesting that the current limiter isn't functioning.
I highly doubt it's that, it was working fine on ubuntu just days before...
tydell wrote:I had similar problem with USB pendrive, it wasn't detected and it makes high cpu usage. It was problem with ehci_hcd module
This one helps me to solve this problem
My USB devices don't even get detected, so that script won't work.
Last night I hibernated my computer after not using any USB devices, on resume, my CPU usage was 100%, removing the ehci_hcd module fixed it.
Any more ideas?
I'm tempted to build a vanilla kernel...

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no please do not cross-post. If you feel that a mistake has been made, Report the post and ask a mod to move it to the appropriate section for you.
Continue discussion here : https://bbs.archlinux.org/viewtopic.php?id=124315
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OK, I just got a new shuffle, and my computeris also new. I am using a Dell with Windows Media XP. I also just installed iTunes 7.5.
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Last edited by DonVla (2010-01-07 22:37:58)

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USB Devices Not Detected and High CPU Usage

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