Bug#822112: still applies to current kernels

From	Ben Hutchings <ben@decadent.org.uk>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#822112: still applies to current kernels
Date	2021-05-17 20:10 +0200
Message-ID	<CfPQJ-1xf-11@gated-at.bofh.it> (permalink)
References	<rqkbE-7J8-5@gated-at.bofh.it> <CdNJo-uu-1@gated-at.bofh.it> <rqkbE-7J8-5@gated-at.bofh.it> <CdNJo-uu-1@gated-at.bofh.it>
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Control: tag -1 wontfix

On Wed, 2021-05-12 at 06:16 +0300, Martin-Éric Racine wrote:
> This still applies to current kernels.
> 
> The problem seems to be that kernels after version 3 implement a
> memory protection scheme that prevents the framebuffer from being
> accessed by both vesafb and X drivers. The Geode X driver does that.

Then this is not a kernel bug.  The change was intentional and
documented in the NEWS file along with the option to revert it:

    - On most architectures, the /dev/mem device can no longer be used to
      access devices that also have a kernel driver.  This breaks dosemu
      and some old user-space graphics drivers.  To allow this, set the
      kernel parameter: iomem=relaxed

Ben.

-- 
Ben Hutchings
Never attribute to conspiracy what can adequately be explained
by stupidity.

Thread

Bug#822112: still applies to current kernels Martin-Éric Racine <martin-eric.racine@iki.fi> - 2021-05-12 05:30 +0200
  Bug#822112: still applies to current kernels Ben Hutchings <ben@decadent.org.uk> - 2021-05-17 20:10 +0200
    Bug#822112: still applies to current kernels Ben Hutchings <ben@decadent.org.uk> - 2021-05-17 20:20 +0200
      Bug#822112: still applies to current kernels Martin-Éric Racine <martin-eric.racine@iki.fi> - 2021-05-17 20:50 +0200

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