all messages for Guix-related lists mirrored at yhetil.org
 help / color / mirror / code / Atom feed
From: "pelzflorian (Florian Pelz)" <pelzflorian@pelzflorian.de>
To: Ricardo Wurmus <rekado@elephly.net>
Cc: 36786@debbugs.gnu.org
Subject: bug#36786: Warn of AMD GPUs unusable with Guix System
Date: Wed, 24 Jul 2019 23:22:54 +0200	[thread overview]
Message-ID: <20190724212254.6odl6pfn42y3rytj@pelzflorian.localdomain> (raw)
In-Reply-To: <874l3bb6e5.fsf@elephly.net>

[-- Attachment #1: Type: text/plain, Size: 885 bytes --]

On Wed, Jul 24, 2019 at 09:05:06PM +0200, Ricardo Wurmus wrote:
> Do you think it would be enough if we pointed to h-node.org and
> mentioned kernel flags that might be useful in certain generic cases?
> 

Yes, that is a very good suggestion and easiest to do.  I did not
think about h-node…  The manual already points there, but the website
should too.  Then this bug can be closed, I think.

Find attached a patch that mentions the kernel flag in the manual’s
Hardware Considerations section.  I do not know if a separate section
would be better.  (The alternative kernel flag “nomodeset” was
reported to not work as well, so I did not mention it, see here:
<https://lists.gnu.org/archive/html/guix-devel/2019-04/msg00089.html>)

h-node currently appears to have no information on those video cards.
I will take a look at how to add information there later.

Regards,
Florian

[-- Attachment #2: 0001-doc-Mention-AMD-Radeon-workaround-when-TTYs-are-not-.patch --]
[-- Type: text/plain, Size: 1614 bytes --]

From e88ee68c09266e1d09d24ff0d1b6ec6a4708841b Mon Sep 17 00:00:00 2001
From: Florian Pelz <pelzflorian@pelzflorian.de>
Date: Wed, 24 Jul 2019 23:02:21 +0200
Subject: [PATCH] doc: Mention AMD Radeon workaround when TTYs are not redrawn.

* doc/guix.texi (Hardware Considerations): Describe workaround.
---
 doc/guix.texi | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/doc/guix.texi b/doc/guix.texi
index f6d9718f59..b9e18e55c4 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -1879,6 +1879,24 @@ Another useful resource is the @uref{https://www.h-node.org/, H-Node}
 web site.  It contains a catalog of hardware devices with information
 about their support in GNU/Linux.
 
+Some hardware requires specific tweaks to work better with Guix System.  The
+following is an incomplete list of known workarounds:
+
+@itemize
+@item
+Some @emph{AMD Radeon} graphics cards stop redrawing the virtual console TTYs
+when booting because of an error with Kernel Mode Setting.  The problem
+disappears when blacklisting the kernel module for the driver.  To do so, you
+can add @code{modprobe.blacklist=radeon} to the Linux-libre kernel flags,
+either for only one boot by pressing the @kbd{e} key in the GRUB bootloader
+and adding this kernel flag to the end of the @code{linux} command-line, or
+permanently by changing the @code{kernel-arguments} field in your
+@code{operating-system} declaration, e.g.:
+
+@example
+(kernel-arguments '("quiet" "modprobe.blacklist=radeon"))
+@end example
+@end itemize
 
 @node USB Stick and DVD Installation
 @section USB Stick and DVD Installation
-- 
2.22.0


  reply	other threads:[~2019-07-24 21:23 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-24 14:56 bug#36786: Warn of AMD GPUs unusable with Guix System pelzflorian (Florian Pelz)
2019-07-24 15:42 ` pelzflorian (Florian Pelz)
2019-07-24 17:53   ` pelzflorian (Florian Pelz)
2019-07-24 19:05     ` Ricardo Wurmus
2019-07-24 21:22       ` pelzflorian (Florian Pelz) [this message]
2019-07-25 23:04       ` Ludovic Courtès
2019-07-26  5:57         ` pelzflorian (Florian Pelz)
2019-07-26 15:56           ` Ludovic Courtès
2019-07-26 20:03             ` pelzflorian (Florian Pelz)
2021-12-07 17:42 ` Denis 'GNUtoo' Carikli
2022-11-15 23:28 ` pelzflorian (Florian Pelz)

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190724212254.6odl6pfn42y3rytj@pelzflorian.localdomain \
    --to=pelzflorian@pelzflorian.de \
    --cc=36786@debbugs.gnu.org \
    --cc=rekado@elephly.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this external index

	https://git.savannah.gnu.org/cgit/guix.git

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.