https://bugzilla.kernel.org/show_bug.cgi?id=215003 Lukas Wunner (lukas@xxxxxxxxx) changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |lukas@xxxxxxxxx --- Comment #2 from Lukas Wunner (lukas@xxxxxxxxx) --- vga_switcheroo_client_probe_defer() only returns true if invoked by the *inactive* GPU's driver. (That's the "pdev != vga_default_device()" condition.) In other words, you've enabled the iGPU but it's not the *active* one. You need to use the gpu-switch utility (https://github.com/0xbb/gpu-switch) to tell the EFI BIOS that it should switch to the iGPU on next boot. That should resolve the issue. Unfortunately we don't support GPU switching for retina MBPs in the kernel yet, hence have to rely on the EFI BIOS to do that for now. (We do support GPU switching for *pre-retina* MBPs in the kernel since early 2016.) However, I'd like to know why apple_gmux fails to probe with "Failed to find gmux I/O resource". Could you attach an ACPI dump to this bugzilla? Thanks! -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
