Public bug reported:
This is my post from the forums (I have reported this as a bug now
because I believe I have found a partial solution):
http://ubuntuforums.org/showthread.php?t=579941
Subj: Networking (wifi) latent/unusable in X but fine in a vc?
I have a rather strange problem.
I have a Compaq C550 laptop (C552US) with integrated WiFi.
I have upgraded from Feisty to Gutsy.
I am using ndiswrapper.
The computer boots up, the WiFi card associates with my AP and receives an
address. Any network access is unusably slow. Pinging either of my APs, I can
see that most packets are dropped and those that are returned have a very long
rtt (mostly 1-2sec+).
However, here's the kicker: if I switch to a vc (using Ctrl+Alt+F#; not logging
out or killing X), network access is slick as it should be, with no or minimal
dropped packets. [EDIT: Incoming traffic is fine as well; e.g., if I ping this
machine from another the latency is normal). A bit of a longshot, but I thought
perhaps somehow the video card was assigned overlapping resources (io, irq,
etc) with the WiFi card - it is not.
Please note I am still using the 2.6.20-15 kernel from Feisty. I wanted to use
the 2.6.22-14 as shipped with Gutsy so I could try the in-kernel bcm43xx
driver, but unfortunately that has an even nastier still problem: the machine
locks up hard at a somewhat random time after the gdm login screen [edit: using
either the i810 or intel X server] (usually after logging in).
The WiFi is an internal miniPCI Broadcom 4311 (according to lspci, rev 01)
Video is i945GM.
I have also tried removing as many unnecessary kernel modules as possible and
tried with and without the 915resolution util.
Cheers,
Jesse
****EDIT: I got this working. I can confirm this appears to be a conflict of
sorts with the "intel" X server; I thought for sure I had tried this but
apparently not: using the legacy i810 server instead solves this problem for
me. There doesn't appear to be any remotely pertinent information in any system
logs, X startup log, etc.
drm module version is 1.1.0 20060810
i915 module version is 1.6.0 20060119
** Affects: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided
Status: New
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Possible severe conflict between intel X server and Broadcom wifi
https://bugs.launchpad.net/bugs/154647
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