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Showing posts from November, 2010

lenovo 3000 n100 custom bios

As one may know, Lenovo 3000 n100 has broken DSDT ACPI table, and as result it reports battery status incorrectly, i.e. BIOS says 'hey, battery status is 20%!', but actually it's 0%, and laptop will shutdown in few minutes. Lenovo engineers were stupid enought to hardcode some values instead of querying smart battery. You can easily check if your laptop is affected: $ cat /proc/acpi/battery/BAT1/info present: yes design capacity: 5200 mAh last full capacity: 5200 mAh See? 'design capacity' and 'last full capacity' are hardcoded. Also BIOS reports incorrect values for 'present rate' and 'present voltage' in /proc/acpi/battery/BAT1/state. Here's how these values should look like: $ cat /proc/acpi/battery/BAT1/state present: yes capacity state: ok charging state: discharging present rate: 1875 mA remaining capacity: 4378 mAh present voltage: 12285 mV