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Message-ID: <alpine.DEB.2.21.2409290048590.21893@angie.orcam.me.uk>
Date: Sun, 29 Sep 2024 01:30:41 +0100 (BST)
From: "Maciej W. Rozycki" <macro@...am.me.uk>
To: Pavel Machek <pavel@....cz>
cc: Linus Torvalds <torvalds@...ux-foundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>, linux@...mhuis.info,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Bricked Thinkpad x220 with 6.12-rc0
On Thu, 26 Sep 2024, Pavel Machek wrote:
> > > When I press power button, it starts producing some noise (hdd
> > > spinning up), but power light goes pulsating, not on, and I stare at
> > > black screen.
> >
> > No beep?
>
> No beep. And no beep when I tried booting with RAM removed.
According to:
<https://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/x220_x220i_x220tablet_x220itablet_ug_en.pdf>
pulsating power-on LED indicates the sleep mode:
"The power switch stays lit whenever the computer is on, blinks when the
computer is in sleep (standby) mode, and is off when the computer is off."
I guess the system has become confused somehow. In the old days pressing
and holding <Insert> while powering a PC up would clear any leftover NVRAM
(ESCD BIOS) state (I earned a dinner once this way). I guess this trick
no longer works nowadays?
I presume you've studied the linked document for any hints?
NB I do believe disconnecting all the power sources is enough for the EC
to get completely reset. It's also what said document suggests to try if
you can't bring a system out of sleep (standby).
Maciej
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