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Signal when console resolution changes (KMS)?
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BitJam
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Joined: 12 Aug 2003
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PostPosted: Wed Jul 23, 2014 10:25 pm    Post subject: Signal when console resolution changes (KMS)? Reply with quote

On many systems the console resolution changes during boot when an KMS enabled video driver is used. Is there any way to get some sort of a signal or a script to run when this happens? The console resolution is usually given in /sys/class/graphics/fb0/virtual_size. So I would like to get a trigger when this file changes, although there may be other solutions. Is there a udev rule that will catch these changes?
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RK
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PostPosted: Sun Jul 27, 2014 3:34 am    Post subject: Reply with quote

You can try SIGWINCH, which is normally ignored. It may or may not be available on your system. Try installing a signal handler with sigaction().
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