Tom Fifield, as per http://support.lenovo.com/us/en/products/Laptops- and-netbooks/ThinkPad-X-Series-laptops/ThinkPad-X250? an update to your computer's buggy and outdated BIOS is available (1.17). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything?
For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette . Please note your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. As well, you don't have to create a new bug report. Once the BIOS is updated, if the problem is still reproducible: 1) Please provide the output of the following terminal command (not perform an apport-collect): sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date 2) Please make a comment specifically advising on if there was an improvement or not. 3) Please mark this report Status Confirmed. If it's not reproducible, please mark this as Invalid. Thank you for your understanding. ** Tags added: bios-outdated-1.17 ** Attachment removed: "ProcEnviron.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1465178/+attachment/4414999/+files/ProcEnviron.txt ** Attachment removed: "Dependencies.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1465178/+attachment/4414998/+files/Dependencies.txt ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1465178 Title: Microcode SW error detected. Restarting 0x2000000 on connecting to AC network with iwlwifi-7265-ucode-25.228.9.0 Status in linux package in Ubuntu: Incomplete Bug description: When trying to connect to an 802.11AC network using an Intel 7265 with firmware iwlwifi-7265-ucode-25.228.9.0 on kernel 3.16.0-38-generic #52~14.04.1-Ubuntu, the error " Microcode SW error detected. Restarting 0x2000000." is received, the card crashes and can't connect to the network. The same card/driver/firmware combination performs well on 2.4GHz networks, and also 802.11a. Call trace: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1465178/+attachment/4540153/+files/log --- ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: fifieldt 2135 F.... pulseaudio /dev/snd/controlC0: fifieldt 2135 F.... pulseaudio CurrentDesktop: Unity DistroRelease: Ubuntu 14.04 HibernationDevice: RESUME=UUID=a83453a5-d150-481d-b8f4-800d6290a06a InstallationDate: Installed on 2015-04-11 (256 days ago) InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1) Lsusb: Bus 001 Device 003: ID 5986:0366 Acer, Inc Bus 001 Device 002: ID 8087:8001 Intel Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: LENOVO 20CMA00ETW Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-55-generic root=UUID=c31100a6-e1cc-4df6-aeb7-521edf7c6c23 ro quiet splash vt.handoff=7 ProcVersionSignature: Ubuntu 3.16.0-55.74~14.04.1-generic 3.16.7-ckt19 RelatedPackageVersions: linux-restricted-modules-3.16.0-55-generic N/A linux-backports-modules-3.16.0-55-generic N/A linux-firmware 1.127.19 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no Tags: trusty Uname: Linux 3.16.0-55-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 12/01/2014 dmi.bios.vendor: LENOVO dmi.bios.version: N10ET27W (1.04 ) dmi.board.asset.tag: Not Available dmi.board.name: 20CMA00ETW dmi.board.vendor: LENOVO dmi.board.version: SDK0E50510 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrN10ET27W(1.04):bd12/01/2014:svnLENOVO:pn20CMA00ETW:pvrThinkPadX250:rvnLENOVO:rn20CMA00ETW:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone: dmi.product.name: 20CMA00ETW dmi.product.version: ThinkPad X250 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1465178/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp