Re: Linux 2.6.21-rc6

On Sunday, 15 April 2007 16:19, Dmitry Torokhov wrote:
On Sunday 15 April 2007 07:16, Rafael J. Wysocki wrote:
On Sunday, 15 April 2007 10:02, Tobias Diedrich wrote:

With CONFIG_PM_DEBUG=y and CONFIG_DISABLE_CONSOLE_SUSPEND=y I see
that the second suspend hangs at "i8042 i8042: EARLY resume".
This is kinda interesting because I'm normally using a USB keyboard
and sure enough, if I hook up a normal keyboard and disable USB
legacy support in the BIOS, then suspend to disk works multiple
times. I'd still rather like to use my USB keyboard though. ;)

Well, I think that when you're using the USB keyboard and the USB legacy
support, the i8042 driver thinks it has a keyboard to handle and tries to
handle it during the suspend, which fails. I don't know why it fails during
the second suspend, though.

Dmitry, could you please have a look?


This is wierd as i8042 does not use suspend_late/resume_early hooks and
so it is impossible for it to hang there. None of input drivers use these
hooks. Could it be that some other driver _after_ i8042 hangs?

Yes.

Tobias, can you please post the dmesg output from after a successful
suspend/resume cycle with CONFIG_PM_DEBUG=y in the 'platform' mode?

And I can now confirm that unpatched 2.6.21-rc6 works fine as long
as USB legacy support is disabled (however without legacy support I
can't use the USB keyboard to control grub).

I think using the 'shutdown' mode of suspend would be better. There's a little
point in using 'platform' on desktop systems anyway.

Frankly, I don't know what to do about it. If we move platform_finish() after
device_resume(), some systems may be broken and I think there are more such
systems than there are systems that set USB legacy support in the BIOS and
have no PS/2 keyboards attached.

I would say that every box that does not use PS/2 keyboard does this.

Quite some people I know use USB keyboards with notebooks, but in these cases
the PS/2 keyboard is still attached (except for notebooks in which the built-in
keyboard is a USB one, that is).

IOW every box with USB keyboard has legacy emulation turned on so quite
few of them...

I have such a machine nearby, so I'll see if I can reproduce the problem.

Greetings,
Rafael

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