** Summary changed:
- Lenovo W520 laptop freezes on ACPI-related actions
+ [Lenovo W520] laptop freezes on ACPI-related actions
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Wow. Everything Emil F. wrote applies to my case. I too have W520 with
1000M and when I change to discreet it freezes shortly after logging
into gnome/unity with either nvidia or nouveau driver. However it works
well with integrated card or with discreet before installing
nvidia/nouveau driver.
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