The same problem is with my HP Compaq nx9420. On new Ubuntu 9.10 (I upgraded recently) it behaves exactly in the same way as on Ubuntu 9.04, which I used before.
The label on the battery reads ~4.8 Ah, but these are the last seen capacities, which I noticed over time: 2.802 Ah 2.600 Ah 2.380 Ah 2.177 Ah ----------------- 2.562 Ah 2.616 Ah 2.651 Ah It seems not to detect "design capacity" at all and instead it sets it to the same value as "last full capacity". When I let the battery to discharge to complete 0 (by disabling automatic hibernation in power manager) it decreases the capacity as can be seen from the first 4 capacity values. When I let the battery to discharge below the critical level but not to total 0 (the laptop usually works 15-30 more minutes after the critical warning) battery capacity goes up - last 3 capacity values. This indicates that the battery HW is OK (2.5 years old) only it's detected wrongly. I assume that capacity gets decreased when discharged to complete 0, because it doesn't save "last full capacity" correctly, when the battery gets empty and sudden shut down occurs. Don't know if this assumption is correct (I just deduced it from observing the battery behavior over time), but anyway I use simple workaround, which is to disable automatic hibernation in power manager and this enables the laptop to use all battery capacity. But the cost is of course sudden shut down, when the battery gets empty - maybe not so good for my HDD I guess:(. -- battery design capacity is reported incorrecly https://bugs.launchpad.net/bugs/363822 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
