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 _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
