https://bugzilla.kernel.org/show_bug.cgi?id=42844





--- Comment #18 from WZab <w...@ise.pw.edu.pl>  2012-09-04 08:36:03 ---
I've performed yet a few tests with selective removal of drivers using the I2C
interface.
I've found, that if I remove both: i915 and nouveau drivers, the system boots
with USB disk connected to USB 3.0 connector.
If ANY of those drivers remains, the system freezes, when booting with USB disk
connected to the USB 3.0 connector.

This finding undermines my theory, that problem is associated with sharing of
IRQ 18 line, as e.g. both xhcd and i915 driver use the MSI interrupts:

# cat /proc/interrupts
[...]
41:          1          0          0          0          0          0         
0          0   PCI-MSI-edge      xhci_hcd
 42:          0          0          0          0          0          0         
0          0   PCI-MSI-edge      xhci_hcd
 43:          0          0          0          0          0          0         
0          0   PCI-MSI-edge      xhci_hcd
 44:          0          0          0          0          0          0         
0          0   PCI-MSI-edge      xhci_hcd
 45:          0          0          0          0          0          0         
0          0   PCI-MSI-edge      xhci_hcd
 46:          0          0          0          0          0          0         
0          0   PCI-MSI-edge      xhci_hcd
 47:          0          0          0          0          0          0         
0          0   PCI-MSI-edge      xhci_hcd
 48:          0          0          0          0          0          0         
0          0   PCI-MSI-edge      xhci_hcd
 49:       1487          0          0          0          0          0         
0          0   PCI-MSI-edge      eth0
 50:      35106          0          0          0          0          0         
0          0   PCI-MSI-edge      ahci
 51:        436          0          0          0          0          0         
0          0   PCI-MSI-edge      iwlwifi
 52:        899          0          0          0          0          0         
0          0   PCI-MSI-edge      i915

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