I've been attempting to solve a bug with i915 & switcheroo on many Macbook Pros (some with nvidia discrete cards, others radeon), report here: https://bugs.freedesktop.org/show_bug.cgi?id=61115 Basically, after switching to i915 using switcheroo the display isn't connected. It was mentioned that some kind of reprobing was needed, so I tried the following: diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index d443441..fbc0d1c 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -1281,6 +1281,13 @@ static void i915_switcheroo_set_state(struct pci_dev *pdev, enum vga_switcheroo_ } } +static void +i915_switcheroo_reprobe(struct pci_dev *pdev) +{ + struct drm_device *dev = pci_get_drvdata(pdev); + intel_fbdev_output_poll_changed(dev); +} + static bool i915_switcheroo_can_switch(struct pci_dev *pdev) { struct drm_device *dev = pci_get_drvdata(pdev); @@ -1295,7 +1302,7 @@ static bool i915_switcheroo_can_switch(struct pci_dev *pdev) static const struct vga_switcheroo_client_ops i915_switcheroo_ops = { .set_gpu_state = i915_switcheroo_set_state, - .reprobe = NULL, + .reprobe = i915_switcheroo_reprobe, .can_switch = i915_switcheroo_can_switch, }; Unfortunately that hasn't solved it. I've attached my dmesg too, since I think the following line is related to the problem: [Firmware Bug]: ACPI(GFX0) defines _DOD but not _DOS I'd be very grateful if somebody with a better understanding of this could take a look - I'll happily test any patches.
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