soft lockup with zd1201 wlan chipset

additional info :

system works well when usb is plugged before loading ubuntu.
if i plug the usb after ubuntu/kernel loads system hangs.

more info :

discovered that sometimes i get device descriptor error when this halt occurs : device descriptor read/64, error -110.
then kernel will try to give it another address, will fail again, etc...

dmesg log is attached - problem can be seen in messages regarding usb 2-2 (lines 25,26,41,56 etc...)

I found out that when there is a device descriptor error like the above my usb mouse doesnt work till I unplug the wireless dongle : it seems it is not getting power (no light).
the dongle does light on despite the error.

Thank you for taking the time to report this bug and helping to make Ubuntu better. This bug did not have a package associated with it, which is important for ensuring that it gets looked at by the proper developers. You can learn more about finding the right package at https://wiki.ubuntu.com/Bugs/FindRightPackage . I have classified this bug as a bug in linux the kernel for Hardy Heron.

after not having this problem for quite a while latest update caused lockups again :
ubuntu locks after logging in to gnome with the error about "gnome settings daemon not responding".
system will respond to alt+ctrl+del only after removing the usb dongle.

I can get to gnome only if i boot without the dongle and then plugging it, but even then sometimes i get the lockups.

thinking it was a kernel issue i went back to 2.6.24-16 from 2.6.24-17 but it didnt help, so it may be a recent package update.

after another update I cant login into gnome anymore - it locks if the dongle is connected during boot (responds only to alt+ctrl+del or commands like : ls,more, etc... after i disconnect the dongle) and shows an error : "could not start gnome-setting-daemon...did not receive a response...etc..."
if the dongle is not connected gnome will load but would lock after connecting the dongle. if i disconnect the dongle after the lockup i get about 1-2 seconds of activity and lockup will resume afterward. no error is shown in any log file. i suspected dhcdbd or avahi-daemon and reinstalled them but it didnt help. it seems like the dongle causes dbus not to respond.

I had managed to get the stick to work for one session - i booted as usual without the usb stick plugged & after gnome was up I plugged it and it somehow worked for 1 session.
So I did an upgrade to 2.6.24-19 and rebooted, but it didnt solve the problem - i still get soft lockups when the device is plugged & randomly it works in about 1/10 tries
I tried running some commands with strace after i got the lock up and i can see it stalls every time when calling ioctl.

any suggestions how to debug?

I managed to activate the wlan by booting with irqpoll/irq=routeirq but it will only work if the device is not plugged during the boot process.

The Ubuntu Kernel Team is planning to move to the 2.6.27 kernel for the upcoming Intrepid Ibex 8.10 release. As a result, the kernel team would appreciate it if you could please test this newer 2.6.27 Ubuntu kernel. There are one of two ways you should be able to test:

1) If you are comfortable installing packages on your own, the linux-image-2.6.27-* package is currently available for you to install and test.

--or--

2) The upcoming Alpha5 for Intrepid Ibex 8.10 will contain this newer 2.6.27 Ubuntu kernel. Alpha5 is set to be released Thursday Sept 4. Please watch http://www.ubuntu.com/testing for Alpha5 to be announced. You should then be able to test via a LiveCD.

Please let us know immediately if this newer 2.6.27 kernel resolves the bug reported here or if the issue remains. More importantly, please open a new bug report for each new bug/regression introduced by the 2.6.27 kernel and tag the bug report with 'linux-2.6.27'. Also, please specifically note if the issue does or does not appear in the 2.6.26 kernel. Thanks again, we really appreicate your help and feedback.

Per a decision made by the Ubuntu Kernel Team, bugs will longer be assigned to the ubuntu-kernel-team in Launchpad as part of the bug triage process. The ubuntu-kernel-team is being unassigned from this bug report. Refer to https://wiki.ubuntu.com/KernelTeamBugPolicies for more information. Thanks.

This bug report was marked as Triaged a while ago but has not had any updated comments for quite some time. Please let us know if this issue remains in the current Ubuntu release, http://www.ubuntu.com/getubuntu/download . If the issue remains, click on the current status under the Status column and change the status back to "New". Thanks.

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This bug report was marked as Incomplete and has not had any updated comments for quite some time. As a result this bug is being closed. Please reopen if this is still an issue in the current Ubuntu release http://www.ubuntu.com/getubuntu/download . Also, please be sure to provide any requested information that may have been missing. To reopen the bug, click on the current status under the Status column and change the status back to "New". Thanks.

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