* Re: [PATCH] video/console/vgacon: Print big fat warning with nomodeset
@ 2018-07-03 7:34 ` Daniel Vetter
0 siblings, 0 replies; 11+ messages in thread
From: Daniel Vetter @ 2018-07-03 7:34 UTC (permalink / raw)
To: Lyude Paul
Cc: dri-devel, linux-fbdev, Kees Cook, Bartlomiej Zolnierkiewicz,
Jan H. Schönherr, linux-kernel, Bjorn Helgaas
On Mon, Jul 02, 2018 at 05:04:40PM -0400, Lyude Paul wrote:
> It's been a pretty good while since kernel modesetting was introduced.
> It has almost entirely replaced previous solutions which required
> userspace modesetting, and I can't even recall any drivers off the top
> of my head for modern day hardware that don't only support one or the
> other. Even nvidia's ugly blob does not require the use of nomodeset,
> and only requires that nouveau be blacklisted.
>
> Effectively, the only thing nomodeset does in the year 2018 is disable
> your graphics drivers. Since VESA is a thing, this will give many users
> the false impression that they've actually fixed an issue they were
> having with their machine simply because the laptop will boot up to a
> degraded GUI. This of course, is never actually the case.
>
> Things get even worse when you consider that there's still an enormous
> amount of tutorials users find on the internet that still suggest adding
> nomodeset, along with various users who have been around long enough to
> still suggest it.
>
> There really isn't any legitimate reason I can see for this to be an
> option that's used by anyone else other then developers, or properly
> informed users. So, let's end the confusion and start printing warnings
> whenever it's enabled.
>
> Signed-off-by: Lyude Paul <lyude@redhat.com>
Yeah makes tons of sense. I think we should also perhaps mark the option
as a tainting one, but I think that's only wired up for module option.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> ---
> drivers/video/console/vgacon.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
> index f09e17b60e45..09731b2f6815 100644
> --- a/drivers/video/console/vgacon.c
> +++ b/drivers/video/console/vgacon.c
> @@ -112,6 +112,11 @@ EXPORT_SYMBOL(vgacon_text_force);
> static int __init text_mode(char *str)
> {
> vgacon_text_mode_force = true;
> +
> + pr_warning("You have booted with nomodeset. This means your GPU drivers are DISABLED\n");
> + pr_warning("Any video related functionality will be severely degraded, and you may not even be able to suspend the system properly\n");
> + pr_warning("Unless you actually understand what nomodeset does, you should reboot without enabling it\n");
> +
> return 1;
> }
>
> --
> 2.17.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [PATCH] video/console/vgacon: Print big fat warning with nomodeset
@ 2018-07-03 7:34 ` Daniel Vetter
0 siblings, 0 replies; 11+ messages in thread
From: Daniel Vetter @ 2018-07-03 7:34 UTC (permalink / raw)
To: Lyude Paul
Cc: linux-fbdev, Kees Cook, Bartlomiej Zolnierkiewicz,
Jan H. Schönherr, linux-kernel, dri-devel, Bjorn Helgaas
On Mon, Jul 02, 2018 at 05:04:40PM -0400, Lyude Paul wrote:
> It's been a pretty good while since kernel modesetting was introduced.
> It has almost entirely replaced previous solutions which required
> userspace modesetting, and I can't even recall any drivers off the top
> of my head for modern day hardware that don't only support one or the
> other. Even nvidia's ugly blob does not require the use of nomodeset,
> and only requires that nouveau be blacklisted.
>
> Effectively, the only thing nomodeset does in the year 2018 is disable
> your graphics drivers. Since VESA is a thing, this will give many users
> the false impression that they've actually fixed an issue they were
> having with their machine simply because the laptop will boot up to a
> degraded GUI. This of course, is never actually the case.
>
> Things get even worse when you consider that there's still an enormous
> amount of tutorials users find on the internet that still suggest adding
> nomodeset, along with various users who have been around long enough to
> still suggest it.
>
> There really isn't any legitimate reason I can see for this to be an
> option that's used by anyone else other then developers, or properly
> informed users. So, let's end the confusion and start printing warnings
> whenever it's enabled.
>
> Signed-off-by: Lyude Paul <lyude@redhat.com>
Yeah makes tons of sense. I think we should also perhaps mark the option
as a tainting one, but I think that's only wired up for module option.
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> ---
> drivers/video/console/vgacon.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
> index f09e17b60e45..09731b2f6815 100644
> --- a/drivers/video/console/vgacon.c
> +++ b/drivers/video/console/vgacon.c
> @@ -112,6 +112,11 @@ EXPORT_SYMBOL(vgacon_text_force);
> static int __init text_mode(char *str)
> {
> vgacon_text_mode_force = true;
> +
> + pr_warning("You have booted with nomodeset. This means your GPU drivers are DISABLED\n");
> + pr_warning("Any video related functionality will be severely degraded, and you may not even be able to suspend the system properly\n");
> + pr_warning("Unless you actually understand what nomodeset does, you should reboot without enabling it\n");
> +
> return 1;
> }
>
> --
> 2.17.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [PATCH] video/console/vgacon: Print big fat warning with nomodeset
2018-07-03 7:34 ` Daniel Vetter
(?)
@ 2018-07-03 11:57 ` Jani Nikula
-1 siblings, 0 replies; 11+ messages in thread
From: Jani Nikula @ 2018-07-03 11:57 UTC (permalink / raw)
To: Daniel Vetter, Lyude Paul
Cc: linux-fbdev, Kees Cook, Bartlomiej Zolnierkiewicz,
Jan H. Schönherr, linux-kernel, dri-devel, Bjorn Helgaas
On Tue, 03 Jul 2018, Daniel Vetter <daniel@ffwll.ch> wrote:
> On Mon, Jul 02, 2018 at 05:04:40PM -0400, Lyude Paul wrote:
>> It's been a pretty good while since kernel modesetting was introduced.
>> It has almost entirely replaced previous solutions which required
>> userspace modesetting, and I can't even recall any drivers off the top
>> of my head for modern day hardware that don't only support one or the
>> other. Even nvidia's ugly blob does not require the use of nomodeset,
>> and only requires that nouveau be blacklisted.
>>
>> Effectively, the only thing nomodeset does in the year 2018 is disable
>> your graphics drivers. Since VESA is a thing, this will give many users
>> the false impression that they've actually fixed an issue they were
>> having with their machine simply because the laptop will boot up to a
>> degraded GUI. This of course, is never actually the case.
>>
>> Things get even worse when you consider that there's still an enormous
>> amount of tutorials users find on the internet that still suggest adding
>> nomodeset, along with various users who have been around long enough to
>> still suggest it.
>>
>> There really isn't any legitimate reason I can see for this to be an
>> option that's used by anyone else other then developers, or properly
>> informed users. So, let's end the confusion and start printing warnings
>> whenever it's enabled.
>>
>> Signed-off-by: Lyude Paul <lyude@redhat.com>
>
> Yeah makes tons of sense. I think we should also perhaps mark the option
> as a tainting one, but I think that's only wired up for module option.
You could do that by adding
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
in text_mode(). If you do that, you should probably amend the warning
message accordingly.
Either way,
Acked-by: Jani Nikula <jani.nikula@intel.com>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>
>> ---
>> drivers/video/console/vgacon.c | 5 +++++
>> 1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
>> index f09e17b60e45..09731b2f6815 100644
>> --- a/drivers/video/console/vgacon.c
>> +++ b/drivers/video/console/vgacon.c
>> @@ -112,6 +112,11 @@ EXPORT_SYMBOL(vgacon_text_force);
>> static int __init text_mode(char *str)
>> {
>> vgacon_text_mode_force = true;
>> +
>> + pr_warning("You have booted with nomodeset. This means your GPU drivers are DISABLED\n");
>> + pr_warning("Any video related functionality will be severely degraded, and you may not even be able to suspend the system properly\n");
>> + pr_warning("Unless you actually understand what nomodeset does, you should reboot without enabling it\n");
>> +
>> return 1;
>> }
>>
>> --
>> 2.17.1
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Jani Nikula, Intel Open Source Graphics Center
^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [PATCH] video/console/vgacon: Print big fat warning with nomodeset
@ 2018-07-03 11:57 ` Jani Nikula
0 siblings, 0 replies; 11+ messages in thread
From: Jani Nikula @ 2018-07-03 11:57 UTC (permalink / raw)
To: Daniel Vetter, Lyude Paul
Cc: linux-fbdev, Kees Cook, Bartlomiej Zolnierkiewicz,
Jan H. Schönherr, linux-kernel, dri-devel, Bjorn Helgaas
On Tue, 03 Jul 2018, Daniel Vetter <daniel@ffwll.ch> wrote:
> On Mon, Jul 02, 2018 at 05:04:40PM -0400, Lyude Paul wrote:
>> It's been a pretty good while since kernel modesetting was introduced.
>> It has almost entirely replaced previous solutions which required
>> userspace modesetting, and I can't even recall any drivers off the top
>> of my head for modern day hardware that don't only support one or the
>> other. Even nvidia's ugly blob does not require the use of nomodeset,
>> and only requires that nouveau be blacklisted.
>>
>> Effectively, the only thing nomodeset does in the year 2018 is disable
>> your graphics drivers. Since VESA is a thing, this will give many users
>> the false impression that they've actually fixed an issue they were
>> having with their machine simply because the laptop will boot up to a
>> degraded GUI. This of course, is never actually the case.
>>
>> Things get even worse when you consider that there's still an enormous
>> amount of tutorials users find on the internet that still suggest adding
>> nomodeset, along with various users who have been around long enough to
>> still suggest it.
>>
>> There really isn't any legitimate reason I can see for this to be an
>> option that's used by anyone else other then developers, or properly
>> informed users. So, let's end the confusion and start printing warnings
>> whenever it's enabled.
>>
>> Signed-off-by: Lyude Paul <lyude@redhat.com>
>
> Yeah makes tons of sense. I think we should also perhaps mark the option
> as a tainting one, but I think that's only wired up for module option.
You could do that by adding
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
in text_mode(). If you do that, you should probably amend the warning
message accordingly.
Either way,
Acked-by: Jani Nikula <jani.nikula@intel.com>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>
>> ---
>> drivers/video/console/vgacon.c | 5 +++++
>> 1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
>> index f09e17b60e45..09731b2f6815 100644
>> --- a/drivers/video/console/vgacon.c
>> +++ b/drivers/video/console/vgacon.c
>> @@ -112,6 +112,11 @@ EXPORT_SYMBOL(vgacon_text_force);
>> static int __init text_mode(char *str)
>> {
>> vgacon_text_mode_force = true;
>> +
>> + pr_warning("You have booted with nomodeset. This means your GPU drivers are DISABLED\n");
>> + pr_warning("Any video related functionality will be severely degraded, and you may not even be able to suspend the system properly\n");
>> + pr_warning("Unless you actually understand what nomodeset does, you should reboot without enabling it\n");
>> +
>> return 1;
>> }
>>
>> --
>> 2.17.1
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Jani Nikula, Intel Open Source Graphics Center
^ permalink raw reply [flat|nested] 11+ messages in thread* Re: [PATCH] video/console/vgacon: Print big fat warning with nomodeset
@ 2018-07-03 11:57 ` Jani Nikula
0 siblings, 0 replies; 11+ messages in thread
From: Jani Nikula @ 2018-07-03 11:57 UTC (permalink / raw)
To: Daniel Vetter, Lyude Paul
Cc: linux-fbdev, Kees Cook, Bartlomiej Zolnierkiewicz,
Jan H. Schönherr, linux-kernel, dri-devel, Bjorn Helgaas
On Tue, 03 Jul 2018, Daniel Vetter <daniel@ffwll.ch> wrote:
> On Mon, Jul 02, 2018 at 05:04:40PM -0400, Lyude Paul wrote:
>> It's been a pretty good while since kernel modesetting was introduced.
>> It has almost entirely replaced previous solutions which required
>> userspace modesetting, and I can't even recall any drivers off the top
>> of my head for modern day hardware that don't only support one or the
>> other. Even nvidia's ugly blob does not require the use of nomodeset,
>> and only requires that nouveau be blacklisted.
>>
>> Effectively, the only thing nomodeset does in the year 2018 is disable
>> your graphics drivers. Since VESA is a thing, this will give many users
>> the false impression that they've actually fixed an issue they were
>> having with their machine simply because the laptop will boot up to a
>> degraded GUI. This of course, is never actually the case.
>>
>> Things get even worse when you consider that there's still an enormous
>> amount of tutorials users find on the internet that still suggest adding
>> nomodeset, along with various users who have been around long enough to
>> still suggest it.
>>
>> There really isn't any legitimate reason I can see for this to be an
>> option that's used by anyone else other then developers, or properly
>> informed users. So, let's end the confusion and start printing warnings
>> whenever it's enabled.
>>
>> Signed-off-by: Lyude Paul <lyude@redhat.com>
>
> Yeah makes tons of sense. I think we should also perhaps mark the option
> as a tainting one, but I think that's only wired up for module option.
You could do that by adding
add_taint(TAINT_USER, LOCKDEP_STILL_OK);
in text_mode(). If you do that, you should probably amend the warning
message accordingly.
Either way,
Acked-by: Jani Nikula <jani.nikula@intel.com>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>
>> ---
>> drivers/video/console/vgacon.c | 5 +++++
>> 1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
>> index f09e17b60e45..09731b2f6815 100644
>> --- a/drivers/video/console/vgacon.c
>> +++ b/drivers/video/console/vgacon.c
>> @@ -112,6 +112,11 @@ EXPORT_SYMBOL(vgacon_text_force);
>> static int __init text_mode(char *str)
>> {
>> vgacon_text_mode_force = true;
>> +
>> + pr_warning("You have booted with nomodeset. This means your GPU drivers are DISABLED\n");
>> + pr_warning("Any video related functionality will be severely degraded, and you may not even be able to suspend the system properly\n");
>> + pr_warning("Unless you actually understand what nomodeset does, you should reboot without enabling it\n");
>> +
>> return 1;
>> }
>>
>> --
>> 2.17.1
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Jani Nikula, Intel Open Source Graphics Center
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 11+ messages in thread