I have the same problem on a Dell Inspiron 6400 notebook (15,4", ATI
x1300), but it behaves differently depending on use of AC power or
battery:

1. On AC power: it turns 100% bright randomly. Manually setting it
darker works for a few minutes, then it increases to 100% again.

2. On battery: The default if darker. Even adjusting to be very bright,
it turns back to the previous value.

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Screen brightness switches from bright to moderate randomly. Ubuntu 7.10
https://bugs.launchpad.net/bugs/153385
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