[Bug 88861] [efi, i915, vgaswitcheroo, black screen, nouveau] Screen goes black when switching from dedicated nvidia graphics card (nouveau) to integrated

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=88861

--- Comment #5 from Paul Hordiienko <pvt.gord at gmail.com> ---
Hi Lukas,

Thank you for the patchset.
It works but partially. Good thing I able to load linux with it.

But there are some problems with switching. 
First, sometimes after switching from intel to nvidia screen becomes black, but
luckily system didn't freeze. It happens not each time. One of the possible way
to repeat this behaviour:
1. Switch to intel gpu and disable nvidia one
2. Start xorg server
3. Stop xorg server
4. Power on nvida card and switch to it
5. Now screen will be black but system will work

Second problem is that unloading of nouveau driver with switched of nvidia gpu
leads to the system freeze.

Please find attached 2 new dmesg logs.

Best regards,

Paul

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