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I use Arch Linux on a laptop with GeForce 840M and built-in Intel graphics.
To switch them I chosen optimus-manager, which was working fine until it stopped to switch to Intel graphics.
It just freezes on the console screen.
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Which version of optimus-manager are you using? What drivers are you using? Does journalctl show any error messages from when it freezes? Is this freeze a change in behavior or something that always happened? If it is a change, what apps were updated prior to the change?
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