Has anyone had problems with a t420 crashing when going into S3 sleep when the always-on usb power is enabled? I've had this machine for years (Win7 64) with no problems but recently it started powering itself off when going to sleep. Windows would then come up with "windows did not shut down correctly - do you want to start normally?" message when powering on. There are no dump files and nothing in the event log other than a notification of an unexpected shutdown. Suspecting a power problem at the hardware/bios level I turned off the always-on usb power setting in the bios and the problem went away.
Think my mainboard might be going flaky?
Henry
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T420 -> always on USB -> sleep -> crash
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Re: T420 -> always on USB -> sleep -> crash
Battery on its last legs?
Lovely day for a Guinness! (The Real Black Stuff)
Lenovo: X240, X250, T440p, T480, M900 Tiny.
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Lenovo: X240, X250, T440p, T480, M900 Tiny.
PS: the old Boardroom website is still available on the Wayback Machine.
Re: T420 -> always on USB -> sleep -> crash
The always on port on those is on a removable board, seperate to the motherboard. You could try renabling it and disconnect pysically to see if it still gives you probs.
Replacements are pretty cheap online, if the board/port is the cause.
Replacements are pretty cheap online, if the board/port is the cause.
| 701c | X220 | T420 | X230 | T430s | W540
Re: T420 -> always on USB -> sleep -> crash
Thanks guys, I'll try disconnecting the board. But maybe a new battery first. The utility says the condition is "good" but I think it's more like "meh".
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