Vikrant, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com /daily-live/current/ .
If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report: apport-collect -p linux <replace-with-bug-number> Also, could you please test the latest upstream kernel available (not the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags: kernel-fixed-upstream kernel-fixed-upstream-VERSION-NUMBER where VERSION-NUMBER is the version number of the kernel you tested. For example: kernel-fixed-upstream-v3.12 This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag: needs-upstream-testing If the mainline kernel does not fix this bug, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-VERSION-NUMBER As well, please remove the tag: needs-upstream-testing Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding. ** Changed in: linux (Ubuntu) Status: Triaged => 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/994104 Title: Wireless performance issues on kernel 3.4.0-1-generic (iwlwifi) Status in The Linux Kernel: New Status in “linux” package in Ubuntu: Incomplete Bug description: I was expecting this to happen but was too lazy on reporting issues on mainline kernels earlier. But now since the 3.4 kernels has made it to quantal repos, I am affected by it. The issue is that on 3.4 kernels (I have tried all mainline kernels RC1 to RC5), my wireless performance goes for toss. I am attaching a screenshot as well on current wireless signal. At same location on my previous precise kernel ( 3.2.0.24) the connection speed is around 52 mpbs (average), but on this kernel the connection is very unstable. As I connect (or when system starts up), the connection speed is like 40mbps, and this degrades in a minute or so to 19 mbps, then to 6 mbps and eventually connection becomes crazily slow on 1 mbps. This is reproducible every time. Hopefully, apport has collected enough information but I will try to provide some more info as part of description. $ lspci -v 03:00.0 Network controller: Intel Corporation Centrino Wireless-N + WiMAX 6150 (rev 67) Subsystem: Intel Corporation Centrino Wireless-N + WiMAX 6150 BGN Flags: bus master, fast devsel, latency 0, IRQ 48 Memory at f5600000 (64-bit, non-prefetchable) [size=8K] Capabilities: <access denied> Kernel driver in use: iwlwifi Kernel modules: iwlwifi Let me know what information I can provide to get help resolve this blocking issue, which wont let me try/test kernel 3.4 further. ProblemType: Bug DistroRelease: Ubuntu 12.10 Package: linux-image-3.4.0-1-generic 3.4.0-1.3 ProcVersionSignature: Ubuntu 3.4.0-1.3-generic 3.4.0-rc5 Uname: Linux 3.4.0-1-generic x86_64 NonfreeKernelModules: nvidia AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25. ApportVersion: 2.0.1-0ubuntu7 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: kx 2169 F.... pulseaudio /dev/snd/controlC0: kx 2169 F.... pulseaudio Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xf6a00000 irq 49' Mixer name : 'Realtek ALC269VB' Components : 'HDA:10ec0269,10431b33,00100100' Controls : 24 Simple ctrls : 13 Card1.Amixer.info: Card hw:1 'NVidia'/'HDA NVidia at 0xf4080000 irq 17' Mixer name : 'Nvidia GPU 15 HDMI/DP' Components : 'HDA:10de0015,10de0101,00100100' Controls : 24 Simple ctrls : 4 Date: Thu May 3 22:20:25 2012 InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901) MachineType: ASUSTeK Computer Inc. G74Sx ProcEnviron: LANGUAGE=en_IN TERM=xterm PATH=(custom, user) LANG=en_IN.UTF-8 SHELL=/bin/bash ProcFB: 0 VESA VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.4.0-1-generic root=UUID=ad1c5163-5aee-4c62-8395-af61ae2995a7 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.4.0-1-generic N/A linux-backports-modules-3.4.0-1-generic N/A linux-firmware 1.80 SourcePackage: linux StagingDrivers: rts5139 mei UpgradeStatus: Upgraded to quantal on 2011-11-17 (167 days ago) dmi.bios.date: 09/23/2011 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: G74Sx.203 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: G74Sx dmi.board.vendor: ASUSTeK Computer Inc. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK Computer Inc. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrG74Sx.203:bd09/23/2011:svnASUSTeKComputerInc.:pnG74Sx:pvr1.0:rvnASUSTeKComputerInc.:rnG74Sx:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0: dmi.product.name: G74Sx dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK Computer Inc. 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