Hi! > I have some issues with resuming from suspend-to-ram with my > Thinkpad X201 - that is, it doesn't resume properly every now and > then, being stuck with a black screen and no keyboard interaction > being possible. > > I already follow the standard PM debugging routine with PM_TRACE. > > dmesg output is here: > http://paste.posativ.org/ys8vdj2ff2d0klyd72nucgsrl9474a08 > > The issues seems to be with something by the name of ACPI HID LID > button (?), whatever that is. > > [ 0.650939] Magic number: 0:836:392 > [ 0.650943] hash matches drivers/base/power/main.c:577 > [ 0.651069] acpi PNP0C0D:00: hash matches > > From https://github.com/torvalds/linux/blob/master/drivers/acpi/button.c: > > #define ACPI_BUTTON_HID_LID "PNP0C0D" > > > Anyway, my question is how I can debug this issue further. > > I reckon I should try unloading the acpi button module before > suspending and modprob'ing it after resume? Yes, that is good first step. > If that works, how can I make out the actual cause of the issue, > i.e. the bug in the driver code? Maybe it's worth noting that I > can't reliably reproduce this since it only happens now and then and > I have yet to recognize a pattern. You may try commenting out code in acpi_button_resume()... but it looks pretty harmless. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
