I just uploaded gaim-thinklight to Debian, and as soon as it is through NEW, you should be able to install as usual. Until them, if you want to try it out, see here. Note that you do need to have the ibm-acpi module installed.
Have something to say? You can post a comment by sending an e-Mail to me at <mail@joachim-breitner.de>, and I will include it here.
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