[ubuntu] cpufreq policy stuck at 800 MHz

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http://ubuntuforums.org – This is to reopen very old thread 700865 because I am having the same annoying issue on Dell Latitude D830 with Karmic kernel 2.6.31-20-generic. If I disconnect AC for more then 16 seconds I need to stay disconnected to get full speed. Otherwise I get stuck to 800MHz. If I reconnect before 16 seconds full speed is kept. All states/governors/frequencies work ok unless I preform the described procedure. If I disable ACPI from grub params or bios it obviously does not happen. Suspend to disk/me (Hardware)