Re: bug: kernel bug when unbinding EFI framebuffer

Ah that explains it. I did not realize that nouveau already unregisters the framebuffer. 

To answer your question on why: I wanted to isolate a GPU so that I pass it forward to a VM. However, as I understand now, I shouldn’t need to touch the EFI framebuffer when using nouveau.

Best regards,

Fabian Mastenbroek

On 12 May 2020, at 22:03, Dave Airlie [off-list ref] wrote:

On Sat, 2 May 2020 at 22:36, Fabian Mastenbroek [off-list ref] wrote:

quoted

Hi,

When I try to unbind the EFI framebuffer via:

       echo -n efi-framebuffer.0 > /sys/bus/platform/drivers/efi-framebuffer/unbind

Can I ask why?

nouveau kicks the efifb off the hw, and unregisters it, but when you
unbind it it tries to unregister again.

It might be possible to block this, but not sure of the point, efifb
is a built-in, you can't unload the module to save memory.

Dave.