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Well following the Debugging IRQ problems guide (https://help.ubuntu.com/community/DebuggingIRQProblems) I seem to have fixed it by booting with acpi=off...not that that leave me much the wiser about...

OK...a clue: Whilst in recovery root mode, on inserting the power I do get "Disabling IRQ #16" at about the time the freeze would otherwise occur, but the system does not freeze. Significance anyone?

Yup...ran the following test:
1. Checked and noted contents of dmesg and ~/.xsession-errors
2. Inserted battery, noted system frozen as expected.
3. Removed battery, noted system unfrozen and...

Hmm...could be I guess - any suggestions how to further diagnose? [I'll start by booting it into its evil Win7 partition and see if that affects it...just as soon as I remember what the password...

Thanks...no its not that - the battery charges OK and the laptop works ok once the battery is charged and its unplugged...

The problem: Dell e5420, Intel Graphics - When plugged into power with the battery in, the system locks up completely.

Workaround: Unplugging the power OR removing the battery immediately fixes...

There's a bunch of threads on this issue, and there is a temporary and a permanent fix.

The previous post provides a temporary solution, ie.
echo N> /sys/module/drm_kms_helper/parameters/poll
...

Sorry - I've been swapping profiles around between machines so much I don't actually know where they came from any more...suspect I should be more methodical. I've got a fresh install on my Dell Mini...

Yeah - I didn't have that file either, but creating it with that line in it did the trick ;)

Having googled and seasrched the forums...here is the solution:

Adding the following line in /etc/modprobe.d/local.conf

options drm_kms_helper poll=N

Then restart. If you wnat to check...

I have a new dual-boot E5420 and it has the same issue - anyone find any solutions?

Add one to the E5420 go-slow on plugging in the power supply....anyone find any solution?

Did you ever find what was causing this? I have a new dell e5420 and its doing exactly the same thing... 12.04 though.

Yeah thanks - I'd seen that - I think I've just got used to the flashing such that it doesn't annoy me enough and will wait and see what happens with a durable fix, which just shows that the rotating...

Here's my ccsm profile...in case it helps! I suspect it has some leftover settings lying around from several iterations of update and trying things out (and it does exhibit the ongoing annoying...

Bit of an update...

I seem to have fixed this by randomly crashing about in ccsm...

I was using Cube, so in the interests of getting to a 'normal' setup I switched to desktop Wall...with the...

Anyone reported a bug on this? I have the same thing - every fullscreen application appears behind the top panel though behaves as if it is behind it...

ALSO, with the launcher in its 12.04...

As someone said early in this thread, Ubuntu 10.04 is NOWHERE NEAR STABLE.
- I'm having the indicator applet issue with both missing nm-applet, AND battery level appearing twice today; also broadcom...

One more suffering the same here - Dell Mini 10v...excruciatingly slow connection which then hangs completely.

If I switch to the b43, I sometimes get superfast (relatively!!) connection until a...

Yeah...it should, and it did - but was a bit slow and kept stalling on a new install on my mini10v. So I tried changing drivers...and now neither work despite several reloads.

Any suggestions as...

OK - so seems the problems are back with this K3760;

So all was fine with 9.10, just using network-manager without VMC. Until, that is, I got fed up with where I was working having a dodgy signal...

UPDATE: After some updates, hacking around and general frustration I have a solution!

Network manager now works fine - but for some reason I had to run the setup wizrad, go through all the way...

WARNING: KARMIC beta and Vodafone K3760 no longer functional.

OK - now I've installed Karmic beta, and my K3760 is now non-functional again. Would suggest avoid this combination until solved.
...

Good to hear the post was helpful - agree with the comment about only plugging it once fully up and logged in - and with regard to the dodgy switch, mine is permanently superglued in the open...

Sorry - not checked back lately - but it only works if you insert the usb modem after you have started up/logged in:

1. Start up, log in.
2. Insert usb modem, wait for red light to come on.
3....