GNU bug report logs - #60010
[version 1.4.0] AMD screen stays black; modprobe fails

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Message #40 received at 60010 <at> debbugs.gnu.org (full text, mbox):

From: "pelzflorian (Florian Pelz)" <pelzflorian <at> pelzflorian.de>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 60010 <at> debbugs.gnu.org
Subject: Re: bug#60010: [version 1.4.0] AMD screen stays black; modprobe fails
Date: Thu, 15 Dec 2022 18:42:59 +0100

[Message part 1 (text/plain, inline)]

Hello Ludo, sorry to say I attempted your modprobe patch that uses
(parameterize ((default-environment-variables …

No good.  Screen is black.  Same [ modprobe ] failure in dmesg on QEMU
and on real AMD hardware.

There are workarounds by surrounding modprobe within strace or
alternatively using kernel-module-loader-service (attached; but again,
without the file-exists? check, this would cause new issues on some
machines that dont need uvesafb).

A stupid

diff --git a/gnu/system/install.scm b/gnu/system/install.scm
index f6f1923121..a99cf09e31 100644
--- a/gnu/system/install.scm
+++ b/gnu/system/install.scm
@@ -289,6 +289,7 @@ (define (uvesafb-shepherd-service _)
          (provision '(maybe-uvesafb))
          (requirement '(file-systems))
          (start #~(lambda ()
+                   (sleep 1)
                     (or (file-exists? "/dev/fb0")
                         (invoke #+(file-append kmod "/bin/modprobe")
                                 "uvesafb"


fails though.

All bad…

Regards,
Florian

[use-kernel-module-loader.patch (text/x-patch, attachment)]

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