Public bug reported:

 USB unstability on AMD 790FX chipset
Hello fellow users,

I'm having rather serious USB issues - while running Ubuntu 8.04 - and
hope to find either a solution OR confirmation that my mainboard is
dodgy in the USB department.

When performing read/write operations on any type of cardreader or USB
harddrive; the USB subsystem comes to a near-complete standstill -
everything freezes except for a secondary wireless keyboard - which
continues to work.. Badly..

Only a full reboot returns the system to normal - zapping X doesn't help.
Rebooting causes the system to repeat long system alarm beeps; right around the 
shutting down hal-daemon message.

Provided no mass storage devices are attached, the system works
perfectly.

I've tried "noapic" "nolapic" and "irqpoll" kernel options - but none of
them have any influence.

I considered power problems; attached devices with powered hubs,
directly to the system ports (hardware side) - and also tried switching
from powernowd, to powersaved, cpufreq and dyncpu (software side) - but
the problem remains.

Frustrated with this problem - I even did the unthinkable.. and
installed Windows XP for a test run - ...and it works fine...

Switching to Windows however will never be an option - I've been running
Linux since 1993 / 1994 and love it.

I've also tested the system on openSuSE 11.1 - which also works
perfectly - aside from the occasional "ghost key strokes".

------could it be that Windows and SuSE up the voltage on the USB
subsystem by default? or that they have a different device
enumeration methods?

The system also won't boot any Debian or Gentoo based system from USB -
which leads me to believe Debian and Gentoo may have similar
configurations in USB handling.

The hardware I use:

PSU: Antec Earthwatts 650 Watt
Mobo: MSI K9A2 Platinum (AMD 790FX chipset)
CPU: AMD Phenom X4 9550
GPU: Nvidia Geforce 8600GT
RAM: Kingston HyperX DDR-2 1066 running @ 800 Mhz for compatibility.

Any thoughts?

Thanks in advance

** Affects: ubuntu
     Importance: Undecided
         Status: New

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USB unstability on AMD 790FX chipset
https://bugs.launchpad.net/bugs/328163
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