Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.19 kernel[0].
If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.19-rc5-vivid/ ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** 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/1413694 Title: Since 3.18.x, iwlwifi has severe connection problems Status in linux package in Ubuntu: Incomplete Bug description: after the switch to 3.18, the wifi connection drops very often (50% of the time or more). dmesg | grep iwlwifi: erik@XPS12-9Q33:~$ dmesg | grep iwlwifi [ 7.026062] iwlwifi 0000:06:00.0: enabling device (0000 -> 0002) [ 7.026551] iwlwifi 0000:06:00.0: irq 45 for MSI/MSI-X [ 7.032559] iwlwifi 0000:06:00.0: loaded firmware version 23.11.10.0 op_mode iwlmvm [ 7.061571] iwlwifi 0000:06:00.0: Detected Intel(R) Dual Band Wireless AC 7260, REV=0x144 [ 7.061906] iwlwifi 0000:06:00.0: L1 Enabled - LTR Enabled [ 7.062376] iwlwifi 0000:06:00.0: L1 Enabled - LTR Enabled [ 8.428473] iwlwifi 0000:06:00.0: L1 Enabled - LTR Enabled [ 8.428976] iwlwifi 0000:06:00.0: L1 Enabled - LTR Enabled [ 1062.829041] iwlwifi 0000:06:00.0: fail to flush all tx fifo queues Q 0 [ 1062.830289] iwlwifi 0000:06:00.0: Current SW read_ptr 100 write_ptr 101 [ 1062.832187] iwlwifi 0000:06:00.0: FH TRBs(0) = 0x8000300d [ 1062.833307] iwlwifi 0000:06:00.0: FH TRBs(1) = 0xc01100c0 [ 1062.834239] iwlwifi 0000:06:00.0: FH TRBs(2) = 0x00000000 [ 1062.835165] iwlwifi 0000:06:00.0: FH TRBs(3) = 0x80300064 [ 1062.836090] iwlwifi 0000:06:00.0: FH TRBs(4) = 0x00000000 [ 1062.837006] iwlwifi 0000:06:00.0: FH TRBs(5) = 0x00000000 [ 1062.837933] iwlwifi 0000:06:00.0: FH TRBs(6) = 0x00000000 [ 1062.838821] iwlwifi 0000:06:00.0: FH TRBs(7) = 0x00709090 [ 1062.839737] iwlwifi 0000:06:00.0: Q 0 is active and mapped to fifo 3 ra_tid 0x0000 [100,101] [ 1062.840675] iwlwifi 0000:06:00.0: Q 1 is active and mapped to fifo 2 ra_tid 0x0000 [0,0] [ 1062.841915] iwlwifi 0000:06:00.0: Q 2 is active and mapped to fifo 1 ra_tid 0x0000 [84,84] [ 1062.842836] iwlwifi 0000:06:00.0: Q 3 is active and mapped to fifo 0 ra_tid 0x0000 [14,14] [ 1062.843777] iwlwifi 0000:06:00.0: Q 4 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0] [ 1062.844695] iwlwifi 0000:06:00.0: Q 5 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0] [ 1062.845917] iwlwifi 0000:06:00.0: Q 6 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0] [ 1062.846825] iwlwifi 0000:06:00.0: Q 7 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0] [ 1062.847723] iwlwifi 0000:06:00.0: Q 8 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0] [ 1062.848612] iwlwifi 0000:06:00.0: Q 9 is active and mapped to fifo 7 ra_tid 0x0000 [145,145] [ 1062.849812] iwlwifi 0000:06:00.0: Q 10 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0] [ 1062.850707] iwlwifi 0000:06:00.0: Q 11 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0] [ 1062.851601] iwlwifi 0000:06:00.0: Q 12 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0] [ 1062.852484] iwlwifi 0000:06:00.0: Q 13 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0] [ 1062.853673] iwlwifi 0000:06:00.0: Q 14 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0] [ 1062.854539] iwlwifi 0000:06:00.0: Q 15 is active and mapped to fifo 5 ra_tid 0x0000 [0,0] [ 1062.855739] iwlwifi 0000:06:00.0: Q 16 is active and mapped to fifo 1 ra_tid 0x0000 [177,219] [ 1062.856623] iwlwifi 0000:06:00.0: Q 17 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0] [ 1062.857829] iwlwifi 0000:06:00.0: Q 18 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0] [ 1062.858725] iwlwifi 0000:06:00.0: Q 19 is inactive and mapped to fifo 0 ra_tid 0x0000 [0,0] DS Parameter set: channel 13 DS Parameter set: channel 1 DS Parameter set: channel 1 DS Parameter set: channel 1 DS Parameter set: channel 6 DS Parameter set: channel 6 DS Parameter set: channel 11 DS Parameter set: channel 13 several APs from different manufacturers are used, no difference WPA2-PSK is used version.log: Ubuntu 3.18.0-9.10-generic 3.18.2 ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: linux-image-3.18.0-9-generic 3.18.0-9.10 ProcVersionSignature: Ubuntu 3.18.0-9.10-generic 3.18.2 Uname: Linux 3.18.0-9-generic x86_64 ApportVersion: 2.15.1-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: erik 8523 F.... pulseaudio /dev/snd/controlC0: erik 8523 F.... pulseaudio CurrentDesktop: LXQt Date: Thu Jan 22 19:26:18 2015 HibernationDevice: RESUME=UUID=ad769441-bb4d-4be0-9cac-5d014f883d3f InstallationDate: Installed on 2014-09-14 (130 days ago) InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140914) MachineType: Dell Inc. XPS 12-9Q33 ProcFB: 0 inteldrmfb ProcKernelCmdLine: \boot\vmlinuz-3.18.0-9-generic.efi.signed ro root=UUID=1551b59c-7fbd-40f7-95c4-47d5359b39dc initrd=boot\initrd.img-3.18.0-9-generic RelatedPackageVersions: linux-restricted-modules-3.18.0-9-generic N/A linux-backports-modules-3.18.0-9-generic N/A linux-firmware 1.141 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/15/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: A06 dmi.board.name: XPS 12-9Q33 dmi.board.vendor: Dell Inc. dmi.board.version: A06 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: Not Specified dmi.modalias: dmi:bvnDellInc.:bvrA06:bd04/15/2014:svnDellInc.:pnXPS12-9Q33:pvrA06:rvnDellInc.:rnXPS12-9Q33:rvrA06:cvnDellInc.:ct8:cvrNotSpecified: dmi.product.name: XPS 12-9Q33 dmi.product.version: A06 dmi.sys.vendor: Dell Inc. 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