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Okay, so as the title says, I run Ubuntu 10.04. The problem is that when I boot it on battery, it doesn't come on. I see a blank screen completely. Sometimes, the Ubuntu splash is visible for a couple of seconds.

Ubuntu boots normally on AC power. But if I unplug it after I boot it up, it runs perfectly too. I can suspend it, log off, everything. I have no graphics card problem, and it doesn't seem that my problem is related to that.

I also run Windows Vista, and it runs perfectly, as it should.

If it would help, I am running an HP tx2001au laptop/tablet. Here are my specs:

CPU: AMD Turion 64x2 TL-58 (1.9 GHz) RAM: 2 GB GPU: nVidia GeForce 6150 Go

Antrikshy
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2 Answers2

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I think that might be your clue @Antrikshy:

Antriksh-PC kernel: [ 1.120446] ACPI: Battery Slot [BAT0] (battery present)

My hunch is that you're seeing a problem because your battery is being improperly detected with ACPI:

ACPI Battery problems in Ubuntu

I've found a few pages which might help simply by google searching "Kernel oops acpi battery". Are you seeing an oops in the dmesg log?

Crap: Since I'm a Noob, I can't post more than one link. So they're below in the comments... I'm a believer Joel, but really? I've got a decent reputation on stackoverflow. I wish there was just one cumulative total...

M. Tibbits
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Is it not staying on or not booting? Is the power light still on after a failed boot or does it go out? Out means battery fail. On means boot fail.

Boot "fail" may be just a VERY long disk check cycle before the system comes up (but should also be that way on AC). Have you tried booting in text mode (not the gui). Have you tried booting from a Ubuntu Live CD instead of your hard disk?

How old is the system (I'm guessing 3 or 4 years) Is your battery getting depleted? Does it boot ok with windows on battery only? Under windows what amount of battery does it claim is available after a full charge? Have you calibrated the battery meter lately under windows?

If you feel comfortable doing it, check the battery voltage with a VOM and compare that to specs for what it should be (varies by model but it should be something just slightly lower than your charger's rated output voltage).

Just like a car, the startup energy for a laptop/tablet is a bit greater than that required to keep it running. Low battery voltage might be why your battery can't start the tablet without a "boost" from the AC. It's only a 4 cell LION battery so it's a bit underpowered (battery-wise) by today's standards, especially if you've doubled the RAM already.

hotei
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