[Bug 47313] serious system latency problems with bcm43xx driver

[Jack O'Quin]

Public bug reported:

I have an HP dv8210us laptop with a built-in Broadcom 4318 wireless
interface.

When I initially installed Dapper Drake, the bcm43xx driver did not work
at all on this system, even after installing the bcm43xx-firmware
package by hand.

Somewhere around the -20 kernel image update (if I recall correctly),
wireless started working.  Hooray!

But, I immediately began noticing flakiness with the mouse pad
interface, which had been quite solid before.  This was severe enough to
often freeze the X window interface (I discovered that switching to VT1
and then back to X will unfreeze things).  In addition, I began seeing
timing glitches with realtime audio.

None of these problems are observed when running over wired ethernet
with the bcm43xx driver rmmod'ed.

So, I conclude that this driver must be holding off other interrupt
handlers and realtime threads way too long.  I can probably get some
actual timing measurements of this, if the driver developers are
interested and don't already know about the problem.

Note: the original reporter indicated the bug was in package 'linux-
image-2.6.15-20-k7'; however, that package was not published in Ubuntu.

** Affects: linux-source-2.6.15 (Ubuntu)
     Importance: Medium
         Status: Fix Released

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serious system latency problems with bcm43xx driver
https://launchpad.net/bugs/47313