[laptop-mode] laptop-mode 1.50 needs DEBUG setting

[Matthijs Kooijman]

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Hi all,

I recently upgraded to laptop-mode-tools v1.50, and got the following error on
every start:

  /usr/sbin/laptop_mode: line 207: [: : integer expression expected

A quick glance on that line points out it is caused by $DEBUG being empty
(probably undefined). It seems this config value is new in 1.50, since I also
saw that the new default configuration has a DEBUG=0 line. However, I kept my
old configuration, since I made a bunch of other changes.

So, I think that laptop-mode-tools doesn't have an internal default for the
DEBUG setting, while I think it should have (it has default values for other
settings as well, right?).

I haven't tried the latest version that was just released, but I didn't find
anything related in the changelog. Reproducing this issue should be easy: Just
remove any DEBUG= line from your configuration.

I haven't got time right now to prepare a proper patch, but the fix should be
pretty trivial.

Gr.

Matthijs

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