battery state on Compaq Presario

Hi there,

Since 2.6.9 kernel I have experienced problems with the battery state on my Compaq Presario 2104EA laptop. I have noticed the problem when running the ubuntu 2.6.8.1 kernel, which I believe is patched with a recent acpi release, and the gentoo-dev-sources 2.6.9. I just installed a 2.4.26 kernel, and have found that it works perfectly.

The problems are quite complicated. Essentially when i boot with the power adapter plugged in, acpid will give me the correct reading of the battery. When there is a CHANGE of AC adapter state (i.e. i unplug it), acpid does not give me the correct battery status, which remains at the level which it was at. The same problem happens if I start the computer without AC power, and plug it in: in this case the battery status does not go down as it should.

Can anyone help me with this? I am fairly certain that it is a bug, and the results when I tested it with the 2.4 kernel have convinced me that this is not a hardware problem.

I thought that I would email this list before contacting the acpi maintainer.

I would be happy to provide any more information, and I hope i've been clear.

Many thanks in advance for your help.

Matt

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I have now submitted a bug report on this issue, but so far haven't had any bites either from my original message to this list or the bug report, so I thought I would try again and see if someone has any advice for me.

Many thanks, Matt

---------- Forwarded message ----------
From: Matthew East <[email protected]>
Date: Wed, 29 Dec 2004 11:11:36 +0000
Subject: battery state on Compaq Presario
To: [email protected]

Hi there,

Since 2.6.9 kernel I have experienced problems with the battery state on my Compaq Presario 2104EA laptop. I have noticed the problem when running the ubuntu 2.6.8.1 kernel, which I believe is patched with a recent acpi release, and the gentoo-dev-sources 2.6.9. I just installed a 2.4.26 kernel, and have found that it works perfectly.

The problems are quite complicated. Essentially when i boot with the power adapter plugged in, acpid will give me the correct reading of the battery. When there is a CHANGE of AC adapter state (i.e. i unplug it), acpid does not give me the correct battery status, which remains at the level which it was at. The same problem happens if I start the computer without AC power, and plug it in: in this case the battery status does not go down as it should.

Can anyone help me with this? I am fairly certain that it is a bug, and the results when I tested it with the 2.4 kernel have convinced me that this is not a hardware problem.

I thought that I would email this list before contacting the acpi maintainer.

I would be happy to provide any more information, and I hope i've been clear.

Many thanks in advance for your help.

Matt

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I can confirm that something similar is happening in my laptop (Acer Ferrari 3400). Here is a typical sequence in my case:

1. Power on with the AC adapter connected. ACPI correctly says that the adapter is on.

2. Unplug the AC adapter: The battery reading reports a discharging state for a few seconds (as expected) but soon it gets stuck in a particular value.

3. The battery may die, the laptop would then automatically shut down, but ACPI would never notice.

I'm running the kernel 2.6.10 with AMD64 support, straight from kernel.org, with no vendor patches. So, this is not just an issue for the HP Pavillon computer.

Pedro

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