On Sunday 24 October 2004 07:28, Pavel Kysilka wrote:
>
> Hi,
>
> i was testing acpi in my computer. i found problem with suspending usb
> device.
>
> i test:
>
> echo 1 > /proc/acpi/sleep
Or better yet, the new-school approach:
echo standby > /sys/power/state
> and i get this output from kernel.log:
>
> ...
> Oct 24 16:02:33 prog3 kernel: uhci_hcd 0000:00:07.3: Unlink after no-IRQ?
> Different ACPI or APIC settings may help.
> Oct 24 16:02:33 prog3 kernel: uhci_hcd 0000:00:07.2: Unlink after no-IRQ?
> Different ACPI or APIC settings may help.
Those look odd ... especially if you've got no USB devices connected,
there should be no URBs that need unlinking! I don't see messages like
those; but maybe it's just because of one of several usbcore PM fixes
I've not yet submitted.
> Oct 24 16:02:33 prog3 kernel: uhci_hcd 0000:00:07.3: suspend D0 --> D1
> Oct 24 16:02:33 prog3 kernel: uhci_hcd 0000:00:07.3: suspend_hc
> Oct 24 16:02:33 prog3 kernel: uhci_hcd 0000:00:07.3: PCI suspend fail, -5
There are mismatches between the upper layers of system suspend
and what PCI does. In particular, the "suspend to ACPI-S1" request
is getting foolishly mapped into "enter PCI state D1", and there's a lot
of UHCI hardware that can't do that.
Sometime next week I'll post a batch of PM updates for USB, one of
which handles this case. I've posted the relevant patch before, but
it probably depends on some of the other updates.
> 0000:00:07.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
Controller (rev 0e) (prog-if 00 [UHCI])
> ...
> Capabilities: [80] Power Management version 2
> Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
> PME(D0-,D1-,D2-,D3hot-,D3cold-)
> Status: D0 PME-Enable- DSel=0 DScale=0 PME-
Exactly: it doesn't support PCI D1 or D2 states. (Or PME# wakeup signaling.)
So it was bogus for the PM core code to tell it to enter that state.
- Dave
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