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Re: Permission for 'dev/pmu'

On Mon, 10 Jan 2005, Michael Schmitz wrote:

> There's not much you can do about that - remember that access to /dev/pmu
> means the console user (if you restrict access by means of some console
> group) can result in PMU communications hiccup, and when the PMU finds the
> host has borked the communications, it will shut down power after some
> timeout, no questions asked. I often find the clock reset to 1904 after
> such a reset, boot variables cleared, and so on.

Actually, no.  When using pbbuttonsd or pmud, a daemon process accesses
/dev/pmu, which dispenses the need for fiddling with user permissions.

> > functionality, and thus acme doesn't really need to be doing it, and i am much
> That's one option. And fblevel from powerpc-utils could be installed suid
> root and used by acme to control brightness, without need for user level
> access to /dev/pmu, for those who don't wish to install pbbuttonsd. (The
> alternative, for acme to set the effective user ID to root before opening
> the PMU, is perhaps too unsafe to consider).

That could work too.  Please add it as a fourth option to bugs 281952+284328.

Martin-Éric Racine, ICT Consultant

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