Comment # 13
on bug 70687
from Armin K
I seem to have discovered the root of the issue. I've just built 3.13-rc5 kernel which has the dynamic powering of the discrete gpu and all hell broke loose. I've narrowed the error down to the pci hotplug driver. My machine loads shpchp pci hotplug driver from what I can see in lsmod output. But the trick is, that there is another pci hotplug driver, acpi pci hotplug one, which seems to break all hell loose here. Disabling it seems to fix everything for me, at least on kernel 3.13. # CONFIG_HOTPLUG_PCI_ACPI is not set This kernel config option is the culprit for this, and that also can be seen from my backtrace: [ 22.731998] [<ffffffff81343cb1>] ? acpiphp_check_bridge+0x72/0x88 So the trick behind this is that acpi pci hotplug driver conflicts with shpchp one that my machine uses. And since it is a builtin driver, and can't be built as module it is always loaded. The other possibility is that this machine doesn't support acpi hotplug, but does support shpc pci hotplug. We need a kernel workarround so that acpi pci hotplug is disabled and out of the way when shpc pci hotplug is enabled.
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