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Date:   Fri, 5 Nov 2021 10:55:39 +0100
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Subject: Re: [PATCH v2 2/2] drm: Move nomodeset kernel parameter to the DRM
 subsystem
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To:     Thomas Zimmermann <tzimmermann@suse.de>,
        linux-kernel@vger.kernel.org
Cc:     =?UTF-8?Q?Michel_D=c3=a4nzer?= <michel@daenzer.net>,
        Daniel Vetter <daniel.vetter@ffwll.ch>,
        Peter Robinson <pbrobinson@gmail.com>,
        Pekka Paalanen <pekka.paalanen@collabora.com>,
        Alex Deucher <alexander.deucher@amd.com>,
        Ben Skeggs <bskeggs@redhat.com>, Chia-I Wu <olvaffe@gmail.com>,
        =?UTF-8?Q?Christian_K=c3=b6nig?= <christian.koenig@amd.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Dave Airlie <airlied@redhat.com>,
        David Airlie <airlied@linux.ie>,
        Gerd Hoffmann <kraxel@redhat.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Gurchetan Singh <gurchetansingh@chromium.org>,
        Hans de Goede <hdegoede@redhat.com>,
        Jani Nikula <jani.nikula@linux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        "Pan, Xinhui" <Xinhui.Pan@amd.com>,
        Rodrigo Vivi <rodrigo.vivi@intel.com>,
        VMware Graphics <linux-graphics-maintainer@vmware.com>,
        Zack Rusin <zackr@vmware.com>, amd-gfx@lists.freedesktop.org,
        dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org,
        linux-fbdev@vger.kernel.org, nouveau@lists.freedesktop.org,
        spice-devel@lists.freedesktop.org,
        virtualization@lists.linux-foundation.org
References: <20211104160707.1407052-1-javierm@redhat.com>
 <20211104160707.1407052-3-javierm@redhat.com>
 <f2c40b22-04bf-e8f2-9839-36d6d26189a1@suse.de>
From:   Javier Martinez Canillas <javierm@redhat.com>
In-Reply-To: <f2c40b22-04bf-e8f2-9839-36d6d26189a1@suse.de>
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On 11/5/21 10:00, Thomas Zimmermann wrote:

[snip]

>> +
>> +static int __init disable_modeset(char *str)
>> +{
>> +	drm_nomodeset = true;
>> +
>> +	pr_warn("You have booted with nomodeset. This means your GPU drivers are DISABLED\n");
>> +	pr_warn("Any video related functionality will be severely degraded, and you may not even be able to suspend the system properly\n");
>> +	pr_warn("Unless you actually understand what nomodeset does, you should reboot without enabling it\n");
> 
> I'd update this text to be less sensational.
>

This is indeed quite sensational. But think we can do it as a follow-up patch.

Since we will have to stick with nomodeset for backward compatibility, I was
planning to add documentation to explain what this parameter is about and what
is the actual effect of setting it.

So I think we can change this as a part of that patch-set.
 
>> +
>> +	return 1;
>> +}
>> +
>> +/* Disable kernel modesetting */
>> +__setup("nomodeset", disable_modeset);
>> diff --git a/drivers/gpu/drm/i915/i915_module.c b/drivers/gpu/drm/i915/i915_module.c
>> index 45cb3e540eff..c890c1ca20c4 100644
>> --- a/drivers/gpu/drm/i915/i915_module.c
>> +++ b/drivers/gpu/drm/i915/i915_module.c
>> @@ -4,8 +4,6 @@
>>    * Copyright © 2021 Intel Corporation
>>    */
>>   
>> -#include <linux/console.h>
>> -
>
> These changes should be in patch 1?
>

Yes, I forgot to move these when changed the order of the patches.

Best regards, -- 
Javier Martinez Canillas
Linux Engineering
Red Hat