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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