** Changed in: linux (Ubuntu)
Status: Expired => Confirmed
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https://bugs.launchpad.net/bugs/1270208
Title:
8086:422b [Dell Latitude E6520] linux-image-3.11.0-15-generic appears
to regress connection speed for iwlwifi
Status in “linux” package in Ubuntu:
Confirmed
Bug description:
I recently installed 13.10 and immediately updated to the latest
updates via my ethernet work connection.
Got home and noted that linux-image-3.11.0-15-generic was only able to
transfer to my local media box via wifi at ~350kB/s (ie. Taking 10+
minutes for a 300Mb file)
After trawling the net for a while, the usual solution appeared to be
"restart with 11n_disable=1 as a module option."
That didn't solve the issue not did several other suggestions. So I
reverted to the other kernal installed on my system linux-
image-3.11.0-12-generic
After booting that kernel my transfer speeds are ~3MB/s - much saner
(though I have had things configured so I get closer to 6MB/s)
Not sure what other info I can provide.
ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: linux-image-3.11.0-12-generic 3.11.0-12.19 [modified:
boot/vmlinuz-3.11.0-12-generic]
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: carlos 2193 F.... pulseaudio
/dev/snd/controlC0: carlos 2193 F.... pulseaudio
Date: Fri Jan 17 23:59:56 2014
HibernationDevice: RESUME=UUID=0fbe8395-5e8d-430f-823c-b5408451c73e
InstallationDate: Installed on 2014-01-14 (3 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64
(20131016.1)
MachineType: Dell Inc. Latitude E6520
MarkForUpload: True
ProcEnviron:
LANGUAGE=en_AU:en
TERM=xterm
PATH=(custom, no user)
LANG=en_AU.UTF-8
SHELL=/bin/bash
ProcFB:
0 inteldrmfb
1 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic
root=UUID=22c75466-3cb5-416a-9513-8debe4246bcd ro quiet splash vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-3.11.0-12-generic N/A
linux-backports-modules-3.11.0-12-generic N/A
linux-firmware 1.116
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/11/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A14
dmi.board.name: 0J4TFW
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvrA14:bd07/11/2012:svnDellInc.:pnLatitudeE6520:pvr01:rvnDellInc.:rn0J4TFW:rvrA01:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6520
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.
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