Comment 157 for bug 1803179

(In reply to arpie from comment #140)
> After hours of experimenting on this laptop :
>
> Computer : PC Specialist OptimusIX 15 (aka Clevo N8xxEP6)
> BIOS : American Megatrends 1.07.13
> OS : Arch Linux
> GPU : NVIDIA GTX 1060 Mobile
>
> Until recently, any attempt to use bumblebee or acpi commands to power down
> the GPU have resulted in a system freeze with lspci, suspend, power cable
> plug in, etc. No kernel line parameters seem to have any effect.
>
> I have discovered that the system freeze is closely linked to the
> interaction between the nvidia graphics card on pci address 0000:01:00.0 and
> its associated sound card at pci address 0000:01:00.1 (I don't actually
> know what that sound card is doing - I presume it's for the HDMI port?)
>
> If I completely disable the audio card using :
> echo 1 | sudo tee /sys/bus/pci/devices/0000:01:00.1/remove
>
> Then the system hangs are completely cured - I can acpi _OFF or _ON or _PS3
> or _PS0 to my hearts content and the gfx card will power up and down
> perfectly, lspci behaves perfectly normally (without any lag), and
> suspend/resume and power cable plug/unplug all works. Even better, kernel
> power management on the PCI bus seems to work perfectly too, but only kicks
> in when I rmmod nvidia. So far, bumblebee and bbswitch also seem to be
> totally happy.
>
> Can anybody else confirm similar findings?
>
> Bear in mind that the audio card needs to be removed BEFORE the kernel loads
> any audio modules. I do it like this :
>
> [Unit]
> Description=Nvidia Audio Card OnBoot Disabler
> Before=bumblebeed.service
>
> [Service]
> Type=oneshot
> RemainAfterExit=yes
> ExecStart=/usr/bin/sh -c "echo 1 > /sys/bus/pci/devices/0000:01:00.1/remove"
> ExecStop=/usr/bin/sh -c "echo 1 > /sys/bus/pci/rescan"
>
> [Install]
> WantedBy=sysinit.target

Not working for me. Still freezing with this.