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We are looking at a freshly installed Ubuntu 11.04 (64bit) on a Lenovo Thinkpad w520 with an Nvidia GPU. The machine freezes eventually during startup on battery. Startup on AC is fine.

The only situation where booting on battery works well is: After a cold shutdown and if the battery has been removed and put back in again prior to booting. Sounds stupid - but that's what I observe.

Sometimes (!) the grub menu is not shown on startup. In this case, the boot process will stop at the stage, when X usually starts. But freeze can also happen after the grub menu has been shown...

Comments:

1) I find it strange, that it is depended on if plugged-in or not, how the boot process takes place prior to grub. Can anybody explain?

2) Everything might be related to power saving treatment or to graphics driver. But I have no idea.

Should any linux-developer be interested in figuring out what the problem actually is, than I would be very happy to provide detailed info on my hardware / system and also I would be happy to spend time for testing.

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What to do with questions that describe known bugs? this has been reported on Launchpad and as such is now closed. –  Marco Ceppi Jun 9 '11 at 1:49
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closed as off topic by Marco Ceppi Jun 9 '11 at 1:49

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1 Answer

This seems to be a common problem. Here is the launchpad bug:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/775950

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Can you add some detail (adding links without some idea of what the link is/does is discouraged here). –  RolandiXor Jun 8 '11 at 18:47
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