[Bug 569841] Re: wireless network has problem connecting and sometimes disconnect

[Chris Kalnmals]

Hey Dave,

Downgrading the kernel really isn't all that difficult. As a matter of
fact, it took me more time to find the kernel and reconfigure GRUB 2 (I
was familiar with the earlier version of GRUB) than it took to do the
install. Here's what you'll need to do:

Download the kernel of your choice. I'm using 2.6.31-21, but it looks
like 2.6.31-22 came out since then. I know for a fact that the former
works . . . not so sure about the latter, so YMMV.

Here's a link to 2.6.31-21: http://packages.ubuntu.com/karmic-updates
/linux-image-2.6.31-21-generic

Here's a link to 2.5.31-22: http://packages.ubuntu.com/karmic/linux-
image-2.6.31-22-generic

Once you get the kernel downloaded, install it. It's just a *.deb, so it
shouldn't be too hard.

After that, you'll need to edit GRUB so that it boots the older kernel
by default. Otherwise, GRUB will keep booting the newest kernel and the
problem won't get fixed. To do that, type cat /boot/grub/grub.cfg into a
terminal and scroll until you find the section that contains the kernel
you just installed (either 2.6.31-21 or -22).

Press Ctrl+Shift+C to copy the quoted text after "menuentry." Mine reads
'Ubuntu, with Linux 2.6.31-21-generic'.

Next, in a terminal, type sudo pico /etc/default/grub. Next to
GRUB_DEFAULT=, paste the text you just copied by pressing Ctrl+Shift+V.
This forces GRUB to pick that exact entry each time the computer boots.
You could also control the default entry by entering the number of the
entry (0 for the first entry, 1 for the second, and so on), but the
number of an entry will change when you update kernels in the future.
Setting the default using the exact name is much safer.

Also, you'll probably want to change GRUB_TIMEOUT= to something greater
than 0. Punch in a (small) number to control how many seconds the GRUB
menu appears at boot. I think it's helpful to have GRUB show up, even if
it's only for a second or two. That way, if something goes wrong, you
have easy access to alternate kernels, memtest, and recovery modes.

Make sure to run sudo update-grub after you finish editing
/etc/default/grub. Restart your computer, and hopefully the kernel
downgrade will fix your wireless issues. Be warned that swapping the
kernel *may* mess up your boot splash screen. Everything will load
properly, but it won't necessarily look pretty and you might get an odd
error message or two. If that happens, don't panic. Just let it run its
course and be patient :-).

-- 
wireless network has problem connecting and sometimes disconnect
https://bugs.launchpad.net/bugs/569841
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