From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: KDFONTOP/PIO_UNIMAPCLR: Input/output error
Date: Wed, 04 Jul 2018 16:10:18 +0200
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References: <20180703101553.702b0b00@alma-ubu>
	<20180703152752.50f1795e@scratchpost.org>
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Hello Danny & all,

Danny Milosavljevic <dannym@scratchpost.org> skribis:

>> PIO_UNIMAPCLR: Input/output error
>> 3) PIO_UNIMAPCLR: Input/output error
>>=20
>> Anything to worry about?
>
> According to https://elixir.bootlin.com/linux/v3.2/source/include/linux/k=
d.h#L70
> that's trying to clear the Unicode -> font map (that is, charmap).
>
> In Linux, ./drivers/tty/vt/vt_ioctl.c implements it.
>
> Can't see how that ever ends up in -EIO O_o

Sometimes we also get:

  putfont: KDFONTOP: Input/output error

In both cases, the warning comes from the =E2=80=98setfont=E2=80=99 program=
, invoked
from =E2=80=98console-font-shepherd-services=E2=80=99.

I=E2=80=99ve looked at the code and man pages and like you, I don=E2=80=99t=
 see where
EIO comes from.  Maybe it=E2=80=99s a generic ioctl error that=E2=80=99s re=
turn before
we reach the actual ioctl implementation in the VT driver, sorta like
EBADF?

Until we find out, I=E2=80=99d like to just silence the warnings:


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--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -754,8 +754,10 @@ to add @var{device} to the kernel's entropy pool.  The service will fail if
                         ;; systemd's vconsole support, let's not treat
                         ;; this as an error.
                         (case (status:exit-val
-                               (system* #$(file-append kbd "/bin/setfont")
-                                        "-C" #$device #$font))
+                               (with-error-to-port (%make-void-port "w")
+                                 (lambda ()
+                                   (system* #$(file-append kbd "/bin/setfont")
+                                            "-C" #$device #$font))))
                           ((0 71) #t)
                           (else #f))))
              (stop #~(const #t))

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Sounds good?

Ludo=E2=80=99.

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