Re: [linux-pm] potential pitfall? changing configuration while PC in hibernate (fwd)

Re: [linux-pm] potential pitfall? changing configuration while PC in hibernate (fwd)

[Michal Semler]

Hi!

It is real stupid, that Linux kernel freezes when simply during hibernate I 
change Bluetooth dongle to USB mouse in my USB port.

And it is not uncommon problem - I have BT dongle that starts in HID proxy 
mode and then I switch it to HCI mode. So I hibernate with BT dongle and 
after hibernate Linux only reads image from Swap and then freezes! :( Problem 
is, that It delete image from swap imeditially after reading it, so when I 
tried is simply with USB mouse (hibernate without it and plug it when 
notebook was switched off) it doesn't read it from swap ever and I lost all 
my memory :(

I can do nothing with this behavior of my dongle and there is no known way how 
to switch it back to HID-proxy mode before hibernate (Marcel correct me if I 
am wrong) - CSR based dongle D-Link with Apple firmware.

Windows knows it and doesn't have problem with it for 5 years! :)

Laptop is all Intel based, kernel 2.6.11.5-vanilla, gcc 3.4.3, Debian testing

Michal


> ----- Forwarded message from David Brownell <david-b@pacbell.net> -----
>
> X-Original-To: pavel@atrey.karlin.mff.cuni.cz
> To: linux-pm@lists.osdl.org
> Subject: Re: [linux-pm] potential pitfall? changing configuration while PC
> in hibernate Cc: Pavel Machek <pavel@ucw.cz>, Arioch <the_Arioch@nm.ru>
> X-Spam-Checker-Version: SpamAssassin 3.0.2 (2004-11-16) on
>  atrey.karlin.mff.cuni.cz
> X-Spam-Level: *
> X-Spam-Status: No, score=1.8 required=5.0 tests=DNS_FROM_RFC_ABUSE,
>  DNS_FROM_RFC_POST autolearn=no version=3.0.2
> X-CRM114-Status: Good  ( pR: 18.5243 )
>
> On Monday 21 March 2005 1:52 am, Pavel Machek wrote:
> > On Po 21-03-05 11:02:04, Arioch wrote:
> > > I wonder, if hardware configuration asked for changes when resuming
> > > from hibernate ?
> >
> > Current position is "don't do this". You *will* be able to recover by
> > passing noresume, but if you change hw configuration, it may crash&burn.
>
> That may be Pavel's position, but USB-wise we absolutely consider
> it a bug if Linux misbehaves in the face of routine actions like
> unplugging a device during suspend (or plugging in a new one).
> Regardless of "noresume" etc.
>
> I'd say that's true for all hotpluggable busses, in fact, but I
> rarely submit patches for non-USB ones like PCMCIA or CardBus.
>
> - Dave
>
>
> ----- End forwarded message -----

-- 
S pozdravem

Michal Semler

Re: [linux-pm] potential pitfall? changing configuration while PC in hibernate (fwd)

[Andrew Morton]

Michal Semler <cijoml@volny.cz> wrote:
>
> It is real stupid, that Linux kernel freezes when simply during hibernate I 
> change Bluetooth dongle to USB mouse in my USB port.
> 
> And it is not uncommon problem - I have BT dongle that starts in HID proxy 
> mode and then I switch it to HCI mode. So I hibernate with BT dongle and 
> after hibernate Linux only reads image from Swap and then freezes! :( Problem 
> is, that It delete image from swap imeditially after reading it, so when I 
> tried is simply with USB mouse (hibernate without it and plug it when 
> notebook was switched off) it doesn't read it from swap ever and I lost all 
> my memory :(
> 
> I can do nothing with this behavior of my dongle and there is no known way how 
> to switch it back to HID-proxy mode before hibernate (Marcel correct me if I 
> am wrong) - CSR based dongle D-Link with Apple firmware.
> 
> Windows knows it and doesn't have problem with it for 5 years! :)
> 
> Laptop is all Intel based, kernel 2.6.11.5-vanilla, gcc 3.4.3, Debian testing

Can you please retest 2.6.12-rc5, see if this bug is still there?

Thanks.

Re: [linux-usb-devel] Re: [linux-pm] potential pitfall? changing configuration while PC in hibernate (fwd)

[David Brownell]

On Wednesday 25 May 2005 4:47 pm, Andrew Morton wrote:
> Michal Semler <cijoml@volny.cz> wrote:
> >
> > It is real stupid, that Linux kernel freezes when simply during hibernate I 
> > change Bluetooth dongle to USB mouse in my USB port.

That is, you unplug the dongle -- breaking the USB power session -- and then
plug in a mouse?  And the kernel does something other than disconnecting the
dongle, and then enumerate a new mouse?  That'd be a bug.  Somewhere.  It'd
probably help a lot if the bluetooth USB driver had a suspend() method.

It's not clear to me what you mean by "hibernate".  If that's an "everything
powered off" pseudo-suspend state, then the dongle should always be getting
disconnected, and USB always re-enumerated by Linux.  Only "real suspend"
states, like suspend-to-RAM, can normally maintain USB power sessions.  And
even then, the device drivers need to be prepared to maintain them ... and
do things like stop active I/O requests, and resume them later.

You said this was an all-Intel system.  So which host controller driver is
in use here ... UHCI?  EHCI?  With RC5 and CONFIG_USB_DEBUG, what do the
USB debug messages say is happening?  Does CONFIG_USB_SUSPEND change things?
Try this with purely modular USB for now.

- Dave

Re: [linux-pm] potential pitfall? changing configuration while PC in hibernate (fwd)

[Michal Semler]

Michal Semler <cijoml@volny.cz> wrote:
>
> It is real stupid, that Linux kernel freezes when simply during hibernate I
> change Bluetooth dongle to USB mouse in my USB port.
>
> And it is not uncommon problem - I have BT dongle that starts in HID proxy
> mode and then I switch it to HCI mode. So I hibernate with BT dongle and
> after hibernate Linux only reads image from Swap and then freezes! :
( Problem
> is, that It delete image from swap imeditially after reading it, so when I
> tried is simply with USB mouse (hibernate without it and plug it when
> notebook was switched off) it doesn't read it from swap ever and I lost all
> my memory :(
>
> I can do nothing with this behavior of my dongle and there is no known way 
how
> to switch it back to HID-proxy mode before hibernate (Marcel correct me if I
> am wrong) - CSR based dongle D-Link with Apple firmware.
>
> Windows knows it and doesn't have problem with it for 5 years! :)
>
> Laptop is all Intel based, kernel 2.6.11.5-vanilla, gcc 3.4.3, Debian 
testing

Can you please retest 2.6.12-rc5, see if this bug is still there?

Thanks.
----------------------------
Hi Andrew,

partial success:

when changing mouse resume from hibernation works

when hibernate with BT dongle in HCI mode and then starts with it (allways 
starts in HIDproxy mode acting as USB mouse and keyboard) kernel still 
freezes after reading 100% of memory from swap.
After reset kernel doesn't attempts to read memory from swap again and so 
memory is lost :(

Other problem is that after hibernate GL application never works anymore
testet x.org with i915 module and xfree-4.3.0 with i830 module:

cijoml@notas:~$ > glxgears
intelWaitIrq: drmI830IrqWait: -16

Michal
--