On Mon, Jun 6, 2011 at 12:03 PM, Carl Karsten <carl@xxxxxxxxxxxxxxxxx> wrote:
> On Sun, Jun 5, 2011 at 8:51 PM, Kenji Kaneshige
> <kaneshige.kenji@xxxxxxxxxxxxxx> wrote:
>> (2011/06/06 8:36), Bjorn Helgaas wrote:
>>>
>>> On Sun, Jun 5, 2011 at 5:57 AM, Carl Karsten<carl@xxxxxxxxxxxxxxxxx>
>>> wrote:
>>>>
>>>> I am wondering why I see a difference between 2 similar setups:
>>>>
>>>> I have 2 laptops, ubuntu 2.6.39-3-generic on both.
>>>> pciehp is included, acpiphp built but not inserted by default.
>>>>
>>>> HP EliteBook 8530w (KS051UA#ABA)
>>>> HP Pavilion dv6700 Notebook PC (KC300UA#ABA)
>>>>
>>>> On the EliteBook, hotplug works: lspci entries come and go, modules
>>>> un/load, udev reports add/remove. good.
>>>>
>>>> On the Pavilion, if I load acpiphp (via /etc/modules), hotplug works.
>>>> If I don't load any additional modules hotplug does not work: insert
>>>> card - nothing in syslog, lspci, udev. If a card is in the slot when
>>>> the kernel loads, it shows in syslog, lscpi and the drivers get
>>>> loaded. If I pull it out, nothing changes: still listed in lspci,
>>>> modules still loaded, dev nodes still around.
>>>>
>>>> Here is some logs lines from Pavilion:
>>>>
>>>> stock module, doesn't work:
>>>> [ 0.560575] pci_hotplug: PCI Hot Plug PCI Core version: 0.5
>>>> [ 0.560605] pciehp: PCI Express Hot Plug Controller Driver version:
>>>> 0.4
>>>
>>> It might be useful to see the entire dmesg log and the "lspci -vv"
>>> output from the Pavilion.
I think the problem is just that pciehp is for native PCIe hotplug and
your PCIe bridges don't seem to support that; they don't have the
"Hot-Plug Capable" bit set in the Slot Capability register:
00:0c.0 PCI bridge: nVidia Corporation MCP67 PCI Express Bridge (rev
a2) (prog-if 00 [Normal decode])
Bus: primary=00, secondary=04, subordinate=05, sec-latency=0
Capabilities: [80] Express (v1) Root Port (Slot+), MSI 00 ...
SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd-
HotPlug- Surprise-
00:0d.0 PCI bridge: nVidia Corporation MCP67 PCI Express Bridge (rev
a2) (prog-if 00 [Normal decode])
Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
Capabilities: [80] Express (v1) Root Port (Slot+), MSI 00
SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd-
HotPlug- Surprise-
It seems like it'd be nice to have acpiphp loaded automatically
somehow, so things would "just work." I don't know Ubuntu's strategy
in that regard. It definitely feels like a broken user experience as
things are. One might argue that if there's no way to autoload
acpiphp, it ought to be built in statically.
Bjorn
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