On Sun, 2012-08-26 at 21:37 +0200, Stefan Nagy wrote: > As the original reporter pointed out, this bug is triggered by a change > in the debian kernel configuration regarding the ACPI PCI Hotplug driver > [1]. Since kernel update linux-image-3.2.0-2-amd64 (3.2.10-1) this > driver is build in (CONFIG_HOTPLUG_PCI_ACPI=y) instead of being compiled > as a module (CONFIG_HOTPLUG_PCI_ACPI=m). > > The kernel changelog lists Ben Hutchings as author for this change: > - [x86] Change HOTPLUG_PCI_ACPI to built-in (Closes: #663433) [2] > > The reason for this decision was that the ACPI PCI Hotplug driver didn't > get loaded on machines which need it for ExpressCard hotplugging to work > [3]. > > Since this bug got no attention at all on the kernel-pci mailinglist for > three months now [4] I wanted to file a bugreport upstream against > driver: pci – but I'm not sure what to do now since it doesn't seem to > be very safe to build-in this driver and maybe the debian kernel team > wants to reconsider this decision…? I think it is the correct decision. Building it as a module effectively meant it was disabled on most machine, since it doesn't get auto-loaded. It may be preferable to return to building it as a module *if* we can arrange for it to be loaded automatically where it's useful. But that presumably would not fix this bug. > Please tell me if this decision is final – even though the kernel fails > to load on at least two recent machines with the ACPI PCI Hotplug driver > build in. If it is I'll file a bugreport upstream. Please test Linux 3.5 (packaged in experimental) and if that has the same problem then open an upstream bug report. > P.S. The default kernel configuration for this item is > CONFIG_HOTPLUG_PCI_ACPI=n. The default kernel configuration has a lot of features disabled that many users need. > I also had a look at this configuration item > in Ubuntu – it's set to CONFIG_HOTPLUG_PCI_ACPI=m. Have you checked whether they add it to /proc/modules? Ben. > [1] http://cateee.net/lkddb/web-lkddb/HOTPLUG_PCI_ACPI.html > [2] > http://packages.debian.org/changelogs/pool/main/l/linux/linux_3.2.23-1/changelog#version3.2.10-1 > [3] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=663433 > [4] http://thread.gmane.org/gmane.linux.kernel.pci/15559 -- Ben Hutchings Experience is what causes a person to make new mistakes instead of old ones.
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