Red Hat Bugzilla – Bug 510893
Battery Charge Level Indicator Incorrect
Last modified: 2009-07-12 13:23:40 EDT
Description of problem:
Battery Charge Level in gnome-power-management applet
Version-Release number of selected component (if applicable):
Issue can be reproduced every time. The battery is fully charged and gnome-power-manager confirms that the battery is fully charged. After unplugging the AC cable, waiting a few seconds, plugging it back in, the gnome-power-manager indicates that the battery is charging and that the battery level is at 87.3%. If you wait approximately 30 seconds the gnome-power-manager applet icon will change from charging to fully charged.
Steps to Reproduce:
1. Begin with laptop plugged in to AC.
2. Make sure battery level reads fully charged.
3. Unplug AC cable from laptop for about 2 or 3 seconds.
4. Plug AC cable back into laptop.
5. Battery charge level reads 87.3%.
6. Don't hold the mouse over the gnome-power-manager applet, wait about 20 to 30 seconds.
7. gnome-power-manager applet will indicate that the battery is fully charged.
If briefly unplugging and plugging back in the AC the battery charge level indicates that it's 87.3%.
I'm not sure what the real number should be, but probably 99.9% or something like that.
Running kernel 126.96.36.199-191.fc11.x86_64.
Laptop is a XPS M1330.
Distribution is running with latest patches and was rebooted prior to performing these tests.
Issue did not exist in previous versions of Fedora.
gnome-power-manager device information reads as follows:
Product: Laptop battery
Percentage charge: 100.0%
Vendor: Samsung SDI
Technology: Lithium Ion
Serial number: xxxxx
Model: DELL PU5567
Capacity: 88.2% (Fair)
Current charge: 86.6 Wh
Design charge: 86.6 Wh
Charge rate: 4.2 W
Can you add screenshots of the statistics graphs in gnome-power-statistics please. Thanks.
Created attachment 351384 [details]
Screenshots of gnome-power-statistics
Cool, thanks for that. The battery looks pretty broken -- it only charges up to 87%, i.e. it looks like the internal calibration is broken. Is the battery very new? In which can discharge the battery from 100->0% and then 0->100% a few times to get the internal calibration bits to function correctly.
If the battery is more than a year old, it's likely it's broken, and you should probably contact dell. Show them the "Laptop Battery History - Charge.png" if they need proof it's broken.