From patchwork Fri Nov 12 13:32:29 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Javier Martinez Canillas X-Patchwork-Id: 12616793 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 826BFC433EF for ; Fri, 12 Nov 2021 13:33:10 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5188D60F5B for ; Fri, 12 Nov 2021 13:33:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 5188D60F5B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id F07456E051; Fri, 12 Nov 2021 13:32:59 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by gabe.freedesktop.org (Postfix) with ESMTPS id 801CC89010 for ; Fri, 12 Nov 2021 13:32:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1636723975; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=3FqzlM6+St6bQetl39I3gwMqH+GHqZeZ7fYAU6/+0T4=; b=RI6DuPi0QABK0o3jmrqBE2n6lxRbjS/gn56u9K1xk8s0rwkQbqb7+oc+WB0JG/O4y1vU4v KBiYci0++Ph1ZhxtaYW/oqzPkNn54OWYUZkZQxBjmHdjwKCwRMtmyWiyAt5W5P+rAoV7kk +yI1xJecOS8FwAC5PxKpy9PiJleVGNg= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-444-_qgKGqaRMvmOyxubFS1Yng-1; Fri, 12 Nov 2021 08:32:54 -0500 X-MC-Unique: _qgKGqaRMvmOyxubFS1Yng-1 Received: by mail-wm1-f71.google.com with SMTP id b133-20020a1c808b000000b0032cdd691994so6303620wmd.1 for ; Fri, 12 Nov 2021 05:32:54 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=3FqzlM6+St6bQetl39I3gwMqH+GHqZeZ7fYAU6/+0T4=; b=rfBau/8SykUiSFeRg1ZG/+lcab9pV3XpXjDjf5rN8IecJdkTwAjBMNtvoWH85FZ8kj afkS2Pn5NCHz2wWQkAz7oMgoZ5n6gROAMl5I7HTctjL5tuOIAMSIT1nSbbLnfjXm5M2I gyLmUJmoNTu8k+tvWrMPbCbSsEIVBHoi+SvbzUwZPyZIWuASZGR3zeT4DjyEh6t/MlXz E4DEamEe7OGAM882FmlSe0xjrW4GW+mMXXV6dJnR1Z7n0bu5DrwHcOVmOsEsxEO0bbwX tDN5VGLuifxAe5cUJ/TEW0AAw/KxCAROpve6nKzzjemdkTvxwnxyrF0uYZBq6Pj/6wj8 PxUQ== X-Gm-Message-State: AOAM530wuh31r8IFs7bkvdlnwuZmNuzhYB3xe9AREYpNjX8YNGdfU7FL 2V/7FuxNFaqLWCSge47sQejYvPUMsS4UjoaDbTGhEPPl1BgK8ny6s3vXJyh1YU2+ByMhHeZJrsS msRNHA9HYFjtwZj7B9vi1P8f5PfP7 X-Received: by 2002:a05:600c:c1:: with SMTP id u1mr34049722wmm.163.1636723973510; Fri, 12 Nov 2021 05:32:53 -0800 (PST) X-Google-Smtp-Source: ABdhPJxXhf8o+Hmrcc8jR2g8wf726UvSKzVQSsR1IKzZrdqoEz7h67KIvU9EZPqzf/sK1e/whAJWug== X-Received: by 2002:a05:600c:c1:: with SMTP id u1mr34049692wmm.163.1636723973313; Fri, 12 Nov 2021 05:32:53 -0800 (PST) Received: from minerva.home ([92.176.231.106]) by smtp.gmail.com with ESMTPSA id z12sm5733470wrv.78.2021.11.12.05.32.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Nov 2021 05:32:53 -0800 (PST) From: Javier Martinez Canillas To: linux-kernel@vger.kernel.org Subject: [PATCH v5 5/6] Documentation/admin-guide: Document nomodeset kernel parameter Date: Fri, 12 Nov 2021 14:32:29 +0100 Message-Id: <20211112133230.1595307-6-javierm@redhat.com> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211112133230.1595307-1-javierm@redhat.com> References: <20211112133230.1595307-1-javierm@redhat.com> MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=javierm@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pekka Paalanen , Jani Nikula , Daniel Vetter , =?utf-8?q?Michel_D=C3=A4nzer?= , Javier Martinez Canillas , dri-devel@lists.freedesktop.org, Peter Robinson , Thomas Zimmermann Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The nomodeset kernel command line parameter is not documented. Its name is quite vague and is not intuitive what's the behaviour when it is set. Document in kernel-parameters.txt what actually happens when nomodeset is used. That way, users could know if they want to enable this option. Signed-off-by: Javier Martinez Canillas Acked-by: Thomas Zimmermann Acked-by: Jani Nikula Acked-by: Pekka Paalanen --- (no changes since v4) Changes in v4: - Don't mention the simpledrm driver and instead explain in high level terms what the nomodeset option is about. Documentation/admin-guide/kernel-parameters.txt | 7 +++++++ 1 file changed, 7 insertions(+) diff --git Documentation/admin-guide/kernel-parameters.txt Documentation/admin-guide/kernel-parameters.txt index 91ba391f9b32..f6434aff943d 100644 --- Documentation/admin-guide/kernel-parameters.txt +++ Documentation/admin-guide/kernel-parameters.txt @@ -3521,6 +3521,13 @@ shutdown the other cpus. Instead use the REBOOT_VECTOR irq. + nomodeset Disable kernel modesetting. DRM drivers will not perform + display-mode changes or accelerated rendering. Only the + system framebuffer will be available for use if this was + set-up by the firmware or boot loader. + + Useful as fallback, or for testing and debugging. + nomodule Disable module load nopat [X86] Disable PAT (page attribute table extension of