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List: opensuse-factory
Subject: Re: Linux graphics on TW: going full-DRM; retiring fbdev drivers
From: Jogchum Reitsma <j.reitsma () hccnet ! nl>
Date: 2021-12-24 10:37:35
Message-ID: 7c7b38ad-54fc-c6d4-414a-e625d896ddfe () hccnet ! nl
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Op 23-12-2021 om 11:00 schreef Thomas Zimmermann:
> tl;dr: Enable DRM for all graphics output and retire fbdev drivers in TW.
>
> Hi!
>
> For quit a few releases, Linux' DRM stack has been able to provide
> display output from the early boot stages on. Next year, we want to
> modernize Tumbleweed's graphics stack and use DRM for all graphics
> output.
>
> To get graphics output during the early stages of booting, Linux
> still uses fbdev infrastructure and a few HW-independed drivers, such
> as efifb and vesafb.
>
> This functionality is now available in DRM as well. We will switch
> early-boot graphics from fbdev to DRM and retire the related fbdev
> drivers. Fbdev userspace interfaces (i.e., /dev/fb0) will still be
> available via the new driver.
>
> The change has no effect on graphics output of the fully booted
> machine. Just as now, at some point during boot, a hardware-specific
> driver, such as amdgpu, i915, etc., will take over the display.
>
> Why switch? The generic DRM driver provides a fallback for all systems
> without hardware-specific drivers. Even with broken hardware drivers,
> generic DRM can most likely boot and provide graphics output. This
> isn't easily possible with fbdev. Fbdev has been out of date for
> several years. Modern graphics userspace slowly uses the ability to
> run on top of fbdev. Most notably, wayland compositors are affected by
> this. We also have received reports about systems being unable to boot
> because of fbdev.
>
> TW's X11 and userspace should be ready (sans bugs). If you want to
> test, Takashi provides a kernel that has full-DRM enabled at
>
> https://download.opensuse.org/repositories/home:/tiwai:/simpledrm/
>
> If you install and boot the kernel, you should ideally see no
> difference. Once booted the hardware's driver will do the graphics
> output. To test if you booted with generic DRM, do
>
> dmesg | grep drm
Here, this gives
drm...
[ 7.933792] [drm] [nvidia-drm] [GPU ID 0x00004100] Loading driver
[ 8.967538] [drm] Initialized nvidia-drm0.0.0 20160202 for
0000:41:00.0 on minor 0
[269005.669940] [drm:drm_new_set_master [drm]] *ERROR* [nvidia-drm] [GPU
ID 0x00004100] Failed to grab modeset ownership
on
Linux linux-mkay 5.15.7-1-default #1 SMP Wed Dec 8 08:54:39 UTC 2021
(b92986a) x86_64 x86_64 x86_64 GNU/Linux
Despite the error mentioned in the last line I encounter no problems
with my graphics setup. But I don't have the expertise to know what it
means.
regards, Jogchum
>
> on the command line. The output should mention 'simpledrm' somewhere.
> If you want to run your system with the generic driver only, pass
>
> nomodeset
>
> on the kernel command line in Grub. The booted system should run with
> only software rendering, but provide useful output via X11, wayland
> and console.
>
> We welcome bug reports. If you find issues, please leave a comment in
> boo#1193250
>
> https://bugzilla.opensuse.org/show_bug.cgi?id=1193250
>
> Best regards
> Thomas
>
>
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<div class="moz-cite-prefix">Op 23-12-2021 om 11:00 schreef Thomas
Zimmermann:<br>
</div>
<blockquote type="cite"
cite="mid:e9d50740-b5a6-029b-47c2-60d640717804@suse.de">tl;dr:
Enable DRM for all graphics output and retire fbdev drivers in TW.
<br>
<br>
Hi!
<br>
<br>
For quit a few releases, Linux' DRM stack has been able to provide
display output from the early boot stages on. Next year, we want
to modernize Tumbleweed's graphics stack and use DRM for all
graphics output.
<br>
<br>
To get graphics output during the early stages of booting, Linux
<br>
still uses fbdev infrastructure and a few HW-independed drivers,
such as efifb and vesafb.
<br>
<br>
This functionality is now available in DRM as well. We will switch
early-boot graphics from fbdev to DRM and retire the related fbdev
drivers. Fbdev userspace interfaces (i.e., /dev/fb0) will still be
available via the new driver.
<br>
<br>
The change has no effect on graphics output of the fully booted
machine. Just as now, at some point during boot, a
hardware-specific driver, such as amdgpu, i915, etc., will take
over the display.
<br>
<br>
Why switch? The generic DRM driver provides a fallback for all
systems without hardware-specific drivers. Even with broken
hardware drivers, generic DRM can most likely boot and provide
graphics output. This isn't easily possible with fbdev. Fbdev has
been out of date for several years. Modern graphics userspace
slowly uses the ability to run on top of fbdev. Most notably,
wayland compositors are affected by this. We also have received
reports about systems being unable to boot because of fbdev.
<br>
<br>
TW's X11 and userspace should be ready (sans bugs). If you want to
test, Takashi provides a kernel that has full-DRM enabled at
<br>
<br>
<a class="moz-txt-link-freetext" \
href="https://download.opensuse.org/repositories/home:/tiwai:/simpledrm/">https://download.opensuse.org/repositories/home:/tiwai:/simpledrm/</a>
<br>
<br>
If you install and boot the kernel, you should ideally see no
difference. Once booted the hardware's driver will do the graphics
output. To test if you booted with generic DRM, do
<br>
<br>
dmesg | grep drm
<br>
</blockquote>
<p>Here, this gives <br>
</p>
<p><span style="font-family:monospace"><span
style="font-weight:bold;color:#ff5454;background-color:#ffffff;">drm</span><span
style="color:#000000;background-color:#ffffff;">...
</span><br>
[ 7.933792] [<span
style="font-weight:bold;color:#ff5454;background-color:#ffffff;">drm</span><span
style="color:#000000;background-color:#ffffff;">] [nvidia-</span><span
style="font-weight:bold;color:#ff5454;background-color:#ffffff;">drm</span><span
style="color:#000000;background-color:#ffffff;">] [GPU ID
0x00004100] Loading driver
</span><br>
[ 8.967538] [<span
style="font-weight:bold;color:#ff5454;background-color:#ffffff;">drm</span><span
style="color:#000000;background-color:#ffffff;">] Initialized
nvidia-</span><span
style="font-weight:bold;color:#ff5454;background-color:#ffffff;">drm</span><span
style="color:#000000;background-color:#ffffff;"> 0.0.0
20160202 for 0000:41:00.0 on minor 0
</span><br>
[269005.669940] [<span
style="font-weight:bold;color:#ff5454;background-color:#ffffff;">drm</span><span
style="color:#000000;background-color:#ffffff;">:</span><span
style="font-weight:bold;color:#ff5454;background-color:#ffffff;">drm</span><span
style="color:#000000;background-color:#ffffff;">_new_set_master
[</span><span
style="font-weight:bold;color:#ff5454;background-color:#ffffff;">drm</span><span
style="color:#000000;background-color:#ffffff;">]] *ERROR*
[nvidia-</span><span
style="font-weight:bold;color:#ff5454;background-color:#ffffff;">drm</span><span
style="color:#000000;background-color:#ffffff;">] [GPU ID
0x00004100] Failed to grab modeset ownership</span></span></p>
<p><span style="font-family:monospace"><span
style="color:#000000;background-color:#ffffff;">on</span></span></p>
<p><span style="font-family:monospace"><span
style="color:#000000;background-color:#ffffff;"><span
style="font-family:monospace"><span
style="color:#000000;background-color:#ffffff;">Linux
linux-mkay 5.15.7-1-default #1 SMP Wed Dec 8 08:54:39 UTC
2021 (b92986a) x86_64 x86_64 x86_64 GNU/Linux</span><br>
<br>
Despite the error mentioned in the last line I encounter no
problems with my graphics setup. But I don't have the
expertise to know what it means.</span></span></span></p>
<p><span style="font-family:monospace"><span
style="color:#000000;background-color:#ffffff;"><span
style="font-family:monospace">regards, Jogchum<br>
</span></span></span></p>
<blockquote type="cite"
cite="mid:e9d50740-b5a6-029b-47c2-60d640717804@suse.de">
<br>
on the command line. The output should mention 'simpledrm'
somewhere. If you want to run your system with the generic driver
only, pass
<br>
<br>
nomodeset
<br>
<br>
on the kernel command line in Grub. The booted system should run
with only software rendering, but provide useful output via X11,
wayland and console.
<br>
<br>
We welcome bug reports. If you find issues, please leave a comment
in boo#1193250
<br>
<br>
<a class="moz-txt-link-freetext" \
href="https://bugzilla.opensuse.org/show_bug.cgi?id=1193250">https://bugzilla.opensuse.org/show_bug.cgi?id=1193250</a>
<br>
<br>
Best regards
<br>
Thomas
<br>
<br>
<br>
</blockquote>
<p><br>
</p>
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