Re: APM suspend on 2.6.0-test9 causes Toshiba 470CDT laptop to hang after resume

Re: APM suspend on 2.6.0-test9 causes Toshiba 470CDT laptop to hang after resume

[David Brownell]

> ... it hung on sync. The kernel seems to continue working, for 
> example I can scroll up, but anything I try to run hangs. USB 
> seems to break as well ...

Sounds exactly like the symptoms that lead me to this patch
(against test7):

   http://marc.theaimsgroup.com/?l=linux-kernel&m=106606272103414&w=2

The issue could show with any resume where the USB controller
lost power, so the devices (including root hub) which were
there before the suspend need to be removed during resume.
That would include swsusp, as well as D3cold.

Patrick has a similar patch, which he's not yet submitted.

- Dave

APM suspend on 2.6.0-test9 causes Toshiba 470CDT laptop to hang after resume

[Vadim]

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When I suspend and later resume on this laptop it looks like 
everything that involves the disk breaks.  For example, when I 
tried this after resume:

dmesg > dmesg.log
sync

it hung on sync. The kernel seems to continue working, for 
example I can scroll up, but anything I try to run hangs. USB 
seems to break as well, if I connect a card reader after resume 
there's no kernel messages, and its LED doesn't light. Here are 
some messages I copied:

(apm --suspend)
hdc: start_power_step(step: 0)
hdc: completing PM request, suspend
hda: start_power_step(step: 0)
hda: start_power_step(step: 1)
hda: complete_power_step(step: 1, stat: 50, err: 0)
hda: completing PM request, suspend
ohci_hdc 000:00:0b.0: suspend D4 --> D3
ohci_hdc 000:00:0b.0: suspend to 3
ohci_hdc 000:00:0b.0: suspended

(resume, apm --suspend not returning, Ctrl+C works to abort it)
ohci_hdc 000:00:0b.0: resume from state D4
ohci_hdc 000:00:0b.0: OHCI 1.0, with legacy support registers
ohci_hdc 000:00:0b.0: control 0x000 HCFS=reset CBSR=0
ohci_hdc 000:00:0b.0: cmdstatus 0x00000 SOC=0
ohci_hdc 000:00:0b.0: intrstatus 0x00000000
ohci_hdc 000:00:0b.0: intrenable 0x00000000
ohci_hdc 000:00:0b.0: USB restart
usb usb1: USB disconnect, address 1
usb 1-1: usb_disable_device nuking all URBs
ohci_hcd 0000:00:0b.0: shutdown urb c1297f00 pipe 40408180 
ep1in-intr
usb usb1: unregistering interface 1-0:1.0
usb usb1: hcd_unlink_urb c1297f00 fail -22

Thanks in advance

-- 
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