GNU logs - #76554, boring messages

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Subject: bug#76554: Laptop screen blank after kexec reboot
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Date: Tue, 25 Feb 2025 15:50:55 +0100
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Hello,

After rebooting with =E2=80=98reboot -k=E2=80=99, my laptop=E2=80=99s scree=
n remains blank.  I
have to type my LUKS passphrase blindly and then it boots fine, even
displays stuff normally on its external monitor, but its own monitor
remains desperately blank.

That=E2=80=99s a 2016 HP laptop with Intel graphics.

Are there known remedies?

At the Guix Days, someday said they experienced a similar problem.

Ludo=E2=80=99.

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: bug#76554: Acknowledgement (Laptop screen blank after kexec reboot)
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--=20
76554: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D76554
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Message sent to bug-guix@HIDDEN:

Subject: bug#76554: Laptop screen blank after kexec reboot
Resent-From: Simon Streit <simon@HIDDEN>
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From: Simon Streit <simon@HIDDEN>
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Date: Wed, 26 Feb 2025 23:10:50 +0100
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Hello Ludovic,

Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> After rebooting with =E2=80=98reboot -k=E2=80=99, my laptop=E2=80=99s scr=
een remains blank.  I
> have to type my LUKS passphrase blindly and then it boots fine, even
> displays stuff normally on its external monitor, but its own monitor
> remains desperately blank.

Interesting.  I just tested it and both internal and external monitor
will remain blank until the passphrase is entered.

Reconnecting the external monitor will not help either.  They appear to
be switched off.


Kind regards

--=20
Simon

Message sent to bug-guix@HIDDEN:

Subject: bug#76554: Laptop screen blank after kexec reboot
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
In-Reply-To: <yguo6yoe4r9.fsf@HIDDEN> (Simon Streit's message of "Wed,
 26 Feb 2025 23:10:50 +0100")
References: <874j0ioz74.fsf@HIDDEN> <yguo6yoe4r9.fsf@HIDDEN>
Date: Thu, 27 Feb 2025 17:30:51 +0100
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Hello,

Simon Streit <simon@HIDDEN> skribis:

> Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
>
>> After rebooting with =E2=80=98reboot -k=E2=80=99, my laptop=E2=80=99s sc=
reen remains blank.  I
>> have to type my LUKS passphrase blindly and then it boots fine, even
>> displays stuff normally on its external monitor, but its own monitor
>> remains desperately blank.
>
> Interesting.  I just tested it and both internal and external monitor
> will remain blank until the passphrase is entered.
>
> Reconnecting the external monitor will not help either.  They appear to
> be switched off.

Oh, worse that what I experienced.

Do you happen to know if it works on other distros with the same
hardware?

It seems to me that it=E2=80=99s a Linux issue because there=E2=80=99s very=
 little we
can do as kexec users, but who knows.

Ludo=E2=80=99.

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Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> Oh, worse than what I experienced.

Still more convenient than typing in the password two times.  I first
thought kexec was not working.  It is an improvement for me already. :)

I just did a reboot with kexec from kexec-tools on an identical machine
running Debian Bookworm with LUKS encryption:

The screen goes on with a blinking prompt.  The external video is on too
and can plug it in and out again.

I just tried it manually with kexec from kexec-tools in Guix.  The
display stayed dark here too and I somehow didn't manage to unlock
the device.  The HDD-Lamp hinted that something was happening.

I looked into dmesg and /var/log/messages.  I see a time gap until the
partition is mounted.  But no hint that a video or state of hardware is
being changed:

--8<---------------cut here---------------start------------->8---
[    2.735156] usb 1-2: New USB device strings: Mfr=3D1, Product=3D2, Seria=
lNumber=3D0
[    2.735161] usb 1-2: Product: Biometric Coprocessor
[    2.735165] usb 1-2: Manufacturer: STMicroelectronics
[    2.874331] Btrfs loaded, zoned=3Dyes, fsverity=3Dyes
[   32.859424] PM: Image not found (code -22)
[   32.874392] BTRFS: device label LABEL devid 1 transid 408044 /dev/dm-0 (=
253:0) scanned by init (1)
[   32.875143] BTRFS info (device dm-0): first mount of filesystem HASHVALUE
[   32.875162] BTRFS info (device dm-0): using crc32c (crc32c-generic) chec=
ksum algorithm
[   32.875179] BTRFS info (device dm-0): using free-space-tree
[   35.910187] shepherd[1]: GNU Shepherd 1.0.2 (Guile 3.0.9, x86_64-unknown=
-linux-gnu)
[   35.910434] shepherd[1]: Starting service root...
[   35.911316] shepherd[1]: Service root started.
[   35.911676] shepherd[1]: Service root running with value #<<process> id:=
 1 command: #f>.
[   35.912303] shepherd[1]: Service root has been started.
[   35.918603] shepherd[1]: starting services...
--8<---------------cut here---------------end--------------->8---

Hope that is getting us a bit further.


Kind regards

--=20
Simon

Last modified: Sun, 2 Mar 2025 18:15:01 UTC

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