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[John Erling Blad <jeblad@xxxxxxxxx>]

Same problem here.  Some notes about what happen.
Sorry for not providing complete logs.
This is my notes which is not very readable, not even for me.. :)

The machine has been continuously updated since 13.10.
Updated from 14.04 to 15.04 by going through 14.10.
All done yesterday. Problem detected when arriving at 15.04.

Usually either a
1: ... rt2x00queue_write_tx_frame: Error - Arrived at non-free entry in the non-full queue 0.
2: ... rt2x00mmio_regbusy_read() Indirect register access failed: offset=0x0000308c, value=0x00010400
  this is followed by: ieee80211 phy0: wlan0: No probe response from AP .... after 500ms, disconnecting
3: ... rt2x00queue_flush_queue: Warning - Queue 0 failed to flush

After turning on nohwcrypt error 1 went away, and was replaced by 2 and 3.
With nohwcrypt turned off I got 2 and then 3, leading to a time out.

1 alone gives failing network

2 and 3, or 3 alone, later gives 
... authenticate with ...
... direct probe to ... (try 1/3)
... direct probe to ... (try 2/3)
... direct probe to ... (try 3/3)
... authentication with ... timed out

and then network fails

$ lspci | fgrep 'Ralink'
03:07.0 Network controller: Ralink corp. RT2561/RT61 802.11.g PCI

Some additional info
  Chipset detected - rt: 2661, rf: 0003, rev: 000b
  Selected rate control algorithm 'minstrel_ht'
  Firmware .. 0.8

It ia an AMD triple core proc

$ uname -a
Linux hydra 3.19.0-17-generic #17-Ubuntu SMP Wed May 6 16:46:12 UTC 2015 x86-64 x86_64 x86_64 GNU/Linux

Just to verify that the module is in fact the latest one. I've compiled
them at one point so just to make sure they are provided by the distro.

$ cat /sys/module/rt2x00*/version
2.3.0 (reported three times)

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1393744

Title:
  1814:0301 RT2x00/rt61pci disconnects since update to 15.04

Status in network-manager package in Ubuntu:
  Triaged

Bug description:
  lsb_release -rd :Description:	Ubuntu Vivid Vervet (development branch)
                               Release:	15.04

  wi-fi disconnects and unable to reconnect since updates on 13-11-2014.

  Also affects Lubuntu 15.04 on same machine.

  Ubuntu 12.04.1 on same machine does not disconnect.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: network-manager 0.9.8.8-0ubuntu34
  ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
  Uname: Linux 3.16.0-24-generic i686
  ApportVersion: 2.14.7-0ubuntu10
  Architecture: i386
  CurrentDesktop: XFCE
  Date: Tue Nov 18 11:12:23 2014
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2014-01-14 (307 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha i386 (20140114)
  IpRoute:
   
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  nmcli-con:
   NAME                      UUID                                   TYPE              TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   DBUS-PATH                                 
   Petersberg                d473a136-74dc-4695-aac3-1fffc9cc8095   802-11-wireless   1416308390   Tue 18 Nov 2014 10:59:50 GMT       yes           no         /org/freedesktop/NetworkManager/Settings/2
   BTWifi-with-FON           a2b63b98-159a-49f4-9247-d46a0d67ed41   802-11-wireless   0            never                              yes           no         /org/freedesktop/NetworkManager/Settings/1
   Petersberg 1              4fc01379-d340-479e-a016-9af1ab717c83   802-11-wireless   1416303120   Tue 18 Nov 2014 09:32:00 GMT       yes           no         /org/freedesktop/NetworkManager/Settings/0
  nmcli-dev:
   DEVICE     TYPE              STATE         DBUS-PATH                                  
   wlan0      802-11-wireless   disconnected  /org/freedesktop/NetworkManager/Devices/0
  nmcli-nm:
   RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   WIFI       WWAN-HARDWARE   WWAN      
   running         0.9.8.8    disconnected    enabled       enabled         enabled    enabled         disabled
  --- 
  ApportVersion: 2.14.7-0ubuntu10
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  peter      1938 F.... pulseaudio
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 15.04
  HibernationDevice: RESUME=UUID=ffe4c76c-645c-4847-ba8c-b2323517a10f
  InstallationDate: Installed on 2014-01-14 (318 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha i386 (20140114)
  MachineType: VIA Technologies, Inc. VT8363
  Package: linux (not installed)
  ProcFB: 0 nouveaufb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-25-generic root=UUID=ed3144cc-8873-40a1-9670-bb2bfc9190a5 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-25-generic N/A
   linux-backports-modules-3.16.0-25-generic  N/A
   linux-firmware                             1.138
  Tags:  vivid
  Uname: Linux 3.16.0-25-generic i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 08/01/2000
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: 6.00 PG
  dmi.board.name: 8363-686A
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvr6.00PG:bd08/01/2000:svnVIATechnologies,Inc.:pnVT8363:pvr:rvn:rn8363-686A:rvr:cvn:ct3:cvr:
  dmi.product.name: VT8363
  dmi.sys.vendor: VIA Technologies, Inc.

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