[Bug 47313] serious system latency problems with bcm43xx driver
joq at io.com
Wed Dec 13 01:23:13 UTC 2006
Public bug reported:
I have an HP dv8210us laptop with a built-in Broadcom 4318 wireless
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)
Status: Fix Released
serious system latency problems with bcm43xx driver
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