iwl3945 bug report (occasionally crashing after suspend)

iwl3945 bug report (occasionally crashing after suspend)

[korgman]

Hello there,

I have the same problem as reported here.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1627828

and here
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1629603

If I understood correctly (form 2nd link) the latest good kernel was 4.4.4 after 4.4.6 we have the problem. (see message #5)

I quote:
"Not a full bisection yet but I have narrowed it down:

I looked at all kernel versions that had changes committed to iwlwifi and tested between them.

I now have determined that I do not have this issue in the kernel version 4.4.4.

I do have the issue in 4.4.6 and that is the next kernel version that has changes to iwlwifi so I guess that is the first bad version."

I am on Slackware-14.2 64bit custom config kernel. I can try some things if you want.

If I modprobe -r iwl3945 | disable wifi (i have physical switch) | suspend to ram | power on | enable wifi (physical switch) | modrpobe iwl3945 the device is working again.

Thank you!

(excuse my bad English)

Re: iwl3945 bug report (occasionally crashing after suspend)

[Stanislaw Gruszka]

On Thu, Mar 16, 2017 at 04:26:10PM +0200, korgman wrote:
> Hello there,
> 
> I have the same problem as reported here.
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1627828
> 
> and here
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1629603

This could be caused by power save, which is disable by default
in the driver but some programs/distribution seems to enable
it without user knowlage. First check: 

$ iw dev wlan0 get power_save

and if PS is enabled, disable by:

$ iw dev wlan0 set power_save off

and check if problem still happen.

> If I understood correctly (form 2nd link) the latest good kernel was 4.4.4 after 4.4.6 we have the problem. (see message #5)
> 
> I quote:
> "Not a full bisection yet but I have narrowed it down:
> 
> I looked at all kernel versions that had changes committed to iwlwifi and tested between them.
> 
> I now have determined that I do not have this issue in the kernel version 4.4.4.
> 
> I do have the issue in 4.4.6 and that is the next kernel version that has changes to iwlwifi so I guess that is the first bad version."

This does not make sense as 3945 device is handled by
iwl3495 (iwlegacy) driver, not by iwlwifi.

Stanislaw