Comment # 9 on bug 1090122 from Stefan Dirsch

(In reply to Vladimir FROMENT from comment #8)
> (In reply to Stefan Dirsch from comment #7)
> > Another option would be to disable Intel graphics (in Firmware) - if
> > possible and then run NVIDIA's proprietary driver. But I'm not sure, whether
> > the hardware supports this (for all needed outputs).
> 
> Do you mean disabling the Intel GPU�in the BIOS�? It is not possible with
> this laptop.

That's why I wrote *if possible*. ;-) Obviously, this is not an option on your
system then.

> Eventually, by following [1] and [2], I could fix the fallback issue by
> setting the kernel parameter "i915.enable_guc=1". This option apparently
> enable advanced drivers for recent Intel chipsets. Following [2] advices, I
> also added enable_rc6=1, enable_fbc=1, enable_psr=1, disable_power_well=0
> and semaphores=1. That seems not to have introduced any regression in my use
> cases. Either under Wayland and Xorg.
> 
> So the bug report can be considered fixed from my point of view (although my
> external screen is still not detected, which is odd because Ubuntu 17.10
> does it, but that's another story). Unless you need more info/logs from me ?
> 
> [1] https://wiki.archlinux.org/index.php/intel_graphics
> [2] https://gist.github.com/Brainiarc7/aa43570f512906e882ad6cdd835efe57

Well, I would call this a workaround, not a fix. Seems option
"i915.enable_guc=1" is enough to fix the issue for you, right?