Ubuntu
linux package

kernel panic in 2.6.27

Bug #283212 reported by Christophe Dumez
4
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Confirmed
Undecided
Unassigned

Bug Description

Binary package hint: linux-source-2.6.27

I have just updated from Hardy to Intrepid and since then I experience random kernel panic (quite often, making system unusable). I believe this is kernel panic because:
- System is totally freezing (unresponsive)
- No ping response
- All laptop LEDs are blinking.

I believe this is related to Wifi driver because it does not seem to be happening when disabling Wifi (hardware switch).
My laptop is a DELL XPS M1330 (shipped with Ubuntu). My network card is an intel 4965agn.

Last working kernel (I tested) was 2.6.24.

Note: There does not seem to be any interesting output in logs...

Revision history for this message
Jean-Baptiste Lallement (jibel) wrote :

Thanks for your report.

This is likely a dup of bug 276990

Can you please provide the following information:
- run the command "sudo lspci -vvnn > lspci-vvnn.log" and attach the file lspci-vvnn.log
- run the command "dmesg > dmesg.log" and attach the file dmesg.log
- the output of the command uname -a

Changed in linux:
status: New → Incomplete
Revision history for this message
Christophe Dumez (hydr0g3n) wrote :

I have reinstalled a clean Intrepid release candidate and updated it yesterday night.

Kernel panic is still happening.

Revision history for this message
Christophe Dumez (hydr0g3n) wrote :
Revision history for this message
Christophe Dumez (hydr0g3n) wrote :

uname -a:
Linux chris-xps 2.6.27-7-generic #1 SMP Fri Oct 24 06:42:44 UTC 2008 i686 GNU/Linux

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Christophe Dumez (hydr0g3n) wrote :

Note that my Access point is in 802.11n mode. I don't know if it matters.

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Christophe Dumez (hydr0g3n) wrote :
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Christophe Dumez (hydr0g3n) wrote :

I'm installing backport modules as said here:
https://wiki.ubuntu.com/IntrepidReleaseNotes#System%20lock-ups%20with%20Intel%204965%20wireless

I'll see if it still happens or not.

Revision history for this message
Christophe Dumez (hydr0g3n) wrote :

Indeed, it looks like I no longer experience kernel panics since I installed backport modules.

This is good but it is still a pity that it cannot be included in intrepid kernel. This is a really annoying issue and it took me time to find help and fix the problem. Intel wireless is widely used and 802.11n will be widely spread soon...

Anyway, intel wireless will fail to connect to 802.11n APs for most users of 2.6.27 kernel due to this bug:
http://www.intellinuxwireless.org/bugzilla/show_bug.cgi?id=1761

Only solution seems to disable WMM feature for now... And they you get kernel panic unless you use backport modules... Hard times for 802.11n users having intel wireless on Linux.

Revision history for this message
Christophe Dumez (hydr0g3n) wrote :

Oh, and I forgot to say that, in the end, we don't even have better than 802.11g speeds. With WMM disabled and backport modules, wireless speed is 54Mbps :(

Apparently, this is "normal" intel will work on this for 2.6.28 kernel (still, too late for intrepid):
http://www.intellinuxwireless.org/bugzilla/show_bug.cgi?id=1761#c22

Revision history for this message
Jean-Baptiste Lallement (jibel) wrote :

Thanks for following up. The information you've provided confirms that this is the same issue. Feel free to add your comment on the other report.

Thanks for your time.

Changed in linux:
status: Incomplete → Confirmed
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