After updating the bios, the issue still persists. WiFi got disconnected within 
5 minutes of reboot and turning on or off WiFi physical switch doesn't help.
However the logs give out different error?field.comment=After updating the 
bios, the issue still persists. WiFi got disconnected within 5 minutes of 
reboot and turning on or off WiFi physical switch doesn't help.
However the logs give out different error now. (see attached syslog.txt)


Oct 13 21:02:26 milkyWay NetworkManager[991]: <info> WiFi hardware radio set 
enabled
Oct 13 21:02:26 milkyWay NetworkManager[991]: <info> WiFi now enabled by radio 
killswitch
Oct 13 21:02:26 milkyWay NetworkManager[991]: <info> (wlan0): bringing up 
device.
Oct 13 21:02:26 milkyWay kernel: [  456.626770] iwlwifi 0000:03:00.0: L1 
Disabled; Enabling L0S
Oct 13 21:02:26 milkyWay kernel: [  456.695941] iwlwifi 0000:03:00.0: Radio 
type=0x0-0x0-0x3
Oct 13 21:02:39 milkyWay kernel: [  462.384154] iwlwifi 0000:03:00.0: Failed to 
load firmware chunk!
Oct 13 21:02:39 milkyWay rtkit-daemon[2254]: The canary thread is apparently 
starving. Taking action.
Oct 13 21:02:39 milkyWay rtkit-daemon[2254]: Demoting known real-time threads.
Oct 13 21:02:39 milkyWay rtkit-daemon[2254]: Successfully demoted thread 2534 
of process 2533 (n/a).
Oct 13 21:02:39 milkyWay rtkit-daemon[2254]: Successfully demoted thread 2533 
of process 2533 (n/a).
Oct 13 21:02:39 milkyWay rtkit-daemon[2254]: Successfully demoted thread 2305 
of process 2252 (n/a).
Oct 13 21:02:39 milkyWay rtkit-daemon[2254]: Successfully demoted thread 2252 
of process 2252 (n/a).
Oct 13 21:02:39 milkyWay rtkit-daemon[2254]: Demoted 4 threads.
Oct 13 21:02:39 milkyWay kernel: [  462.384164] iwlwifi 0000:03:00.0: Could not 
load the [0] uCode section
Oct 13 21:02:39 milkyWay kernel: [  462.384178] iwlwifi 0000:03:00.0: Failed to 
start RT ucode: -110
Oct 13 21:02:39 milkyWay kernel: [  462.388134] iwlwifi 0000:03:00.0: Failing 
on timeout while stopping DMA channel 0 [0x5a5a5a5a]  
Oct 13 21:02:39 milkyWay kernel: [  462.388134] iwlwifi 0000:03:00.0: Failing 
on timeout while stopping DMA channel 2 [0x5a5a5a5a]  
Oct 13 21:02:39 milkyWay kernel: [  462.388134] iwlwifi 0000:03:00.0: Failing 
on timeout while stopping DMA channel 5 [0x5a5a5a5a]  
Oct 13 21:02:39 milkyWay kernel: [  462.388134] iwlwifi 0000:03:00.0: Failing 
on timeout while stopping DMA channel 7 [0x5a5a5a5a]  
Oct 13 21:02:41 milkyWay kernel: [  471.383988] iwlwifi 0000:03:00.0: Unable to 
initialize device.

Thanks,
Anshul

** Attachment added: "syslog.txt"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1380276/+attachment/4234504/+files/syslog.txt

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1380276

Title:
  WiFi disconnects and unable to discover network until reboot after
  upgrading to linux 3.13.0.37

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