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Lamont R. Peterson wrote:

However, if I sit here doing nothing (not logged in, even), this thing will die in only 25 minutes, max. If I turn the LCD backlight off entirely, I get about 30 minutes. The battery is old, so I'm sure the sensors aren't entirely to blame for this discrepancy. This is with FC5, but I'm using the 2.6.16-1.2080_FC5 kernel because something is wrong with the initrd images produced after that preventing them from booting (but that's a different conversation).

Next time you're in SuSE it would be interesting to compare the idle battery drain numbers, but I guess it will be hard to track down from which direction the problem is coming if they are radically different. You could progressively disable peripherals in /etc/modprobe.conf I guess. It can be something like leaving the 3D unit or Wifi radio powered up. The fans. Or maybe even how ALSA leaves the speakers when nothing plays.

What kind of 'die' is it? If it is an orderly kind of shutdown maybe the problem is even coming from the threshold where it is decided to shutdown.

I must say this laptop, Samsung Q35, was advertised as having a 7 hour battery life. I haven't timed it but it is something along the lines of a 2h 30m under FC5, with laptop mode but admittedly not at the lowest brightness. It would be wonderful if that was due to some kernel configuration choices that could be undone, but I doubt it :-) It won't come back up from Hibernate either.


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