linux-kernel - Re: Bricked Thinkpad x220 with 6.12-rc0

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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