Same problem here:
During the power cable is connected the wireless connection works fine. This
means I can ping my router with 1ms round trip time. And accessing my NAS via
NFS to do diretory listings and viewing images is fast as usual.
As soon as I disconnect my laptop from the power plug the ping rountrip times
go up rapidely. Sometimes up to 4000ms!
This bad network performance is hard to go undetected because a simple image
takes very long to load (approx. one minute). Even diretory listings of NFS
mounts takes a few seconds. Everything works fine after I plug in the power
cord again.
Stock ubuntu 11.04. Fresh install on Dell Vostro V131, intel i5, 120GB
SSD.
sogue@valnik:/media$ uname -a
Linux valnik 2.6.38-11-generic #50-Ubuntu SMP Mon Sep 12 21:17:25 UTC 2011
x86_64 x86_64 x86_64 GNU/Linux
sogue@valnik:/media$ cat /etc/issue.net
Ubuntu 11.04
sogue@valnik:/media$ iwconfig # power plug is plugged in -> Power management is
off
<snip>
wlan0 IEEE 802.11bgn ESSID:"frodo"
Mode:Managed Frequency:2.412 GHz Access Point: 00:1E:69:69:6D:F4
Bit Rate=54 Mb/s Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=70/70 Signal level=-40 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:6871 Missed beacon:0
<snip>
sogue@valnik:/media$ iwconfig # running from battery -> Power management is on
<snip>
Power Management:on
<snip>
sogue@valnik:/media$ sudo lshw -C network
<snip>
*-network
description: Wireless interface
product: Centrino Wireless-N 1030
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:09:00.0
logical name: wlan0
version: 34
serial: ac:72:89:cb:44:40
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical
wireless
configuration: broadcast=yes driver=iwlagn
driverversion=2.6.38-11-generic firmware=17.168.5.2 build 35905 ip=192.168.0.13
latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
resources: irq:49 memory:f7e00000-f7e01fff
<snip>
dmesg shows the following lines when disconnecting the battery, but that
is not a bug! This is the wanted behaviour, to commit the ext journal
more often when running from battery! So please do _not_ run "chmod -x
/usr/lib/pm-utils/power.d/journal-commit" unless you know what you are
doing.
After a "sudo chmod -x /usr/lib/pm-utils/power.d/wireless" the problem
is fixed: The ping round trip times are the same when running from power
plug and running from battery.
Also running "iwconfig" when running from battery now shows that the
power mangement of the network card is disabled.
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https://bugs.launchpad.net/bugs/811552
Title:
network delay increases when switching to battery
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/pm-utils/+bug/811552/+subscriptions
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