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[AceLan Kao <727620@xxxxxxxxxxxxxxxxxx>]

Seth,

To exam your assumption, I reverted that commit and replaced the vga_arbiter_check_bridge_sharing() function call by some delays, but I still encountered the issue.
The error message is the same.
Do you have any suggestion to do the test?

==================
diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index ace2b16..5b93935 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -500,6 +500,8 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
                vga_default = pci_dev_get(pdev);
 #endif

+       msleep(1000);
+
        /* Add to the list */
        list_add(&vgadev->list, &vga_list);
        vga_count++;
===================

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https://bugs.launchpad.net/bugs/727620

Title:
  [Radeon HD 5650 and 5470] Kernel BUG during recovery boot and in
  normal boot (Hybrid graphics)

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