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Strange problem with Optimus in HP dv4-5113tx

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https://bbs.archlinux.org – Hi all.I have arch64 installed in my new laptop with Optimus. And the graphics drivers installation part strictly follows http://www.pavanky.com/archlinux-cuda-o … ge-kepler/Although using bumblebee I can use `optirun` to run applications via nVIDIA GPU.But I still can not work if I don't load the kernel with 'nomodeset' parameter.If 'nomodeset' is not presented. The screen would be off after 'Waiting for uDEV events'.Or if I compiled 'i915' module into initramfs the screen would be off immediately after the initramfs is loaded.Even when blackscre (HowTos)