linux-kernel - Re: acr: failed to load firmware with Kernel 5.6. Kernel 5.5 works just fine.

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Date:   Sat, 4 Apr 2020 12:12:49 +0200
From:   Zeno Davatz <zdavatz@...il.com>
To:     Ilia Mirkin <imirkin@...m.mit.edu>
Cc:     Ben Skeggs <bskeggs@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        nouveau <nouveau@...ts.freedesktop.org>
Subject: Re: acr: failed to load firmware with Kernel 5.6. Kernel 5.5 works
 just fine.

Dear Ilia

FYI:

On Fri, Apr 3, 2020 at 8:31 PM Ilia Mirkin <imirkin@...m.mit.edu> wrote:

> Depends on distro specifics. Also the firmware has to be available at
> the time that nouveau loads. The corollary to this is:
>
> If it's built into the kernel, then the firmware must also be included
> in the kernel (since this happens before any FS stuff)
> If it's loaded as a module from initrd, then initrd must contain the firmware
>
> If you need help including firmware in the right place, a distro
> support channel is probably your best shot.

https://forums.developer.nvidia.com/t/nvidia-driver-does-not-work-for-kernel-5-6-nvidia-gp107/118413/6

/usr/src/linux> dmesg | grep nvidia
[    3.203080] nvidia: loading out-of-tree module taints kernel.
[    3.203088] nvidia: module license 'NVIDIA' taints kernel.
[    3.218324] nvidia-nvlink: Nvlink Core is being initialized, major
device number 248
[    3.218640] nvidia 0000:05:00.0: vgaarb: changed VGA decodes:
olddecodes=io+mem,decodes=none:owns=io+mem
[    3.431032] nvidia-modeset: Loading NVIDIA Kernel Mode Setting
Driver for UNIX platforms  440.64  Fri Feb 21 00:43:19 UTC 2020
[    3.451954] [drm] [nvidia-drm] [GPU ID 0x00000500] Loading driver
[    3.451956] [drm] Initialized nvidia-drm 0.0.0 20160202 for
0000:05:00.0 on minor 1

Best
Zeno

On Fri, Apr 3, 2020 at 8:31 PM Ilia Mirkin <imirkin@...m.mit.edu> wrote:
>
> On Fri, Apr 3, 2020 at 1:59 PM Zeno Davatz <zdavatz@...il.com> wrote:
> >
> > On Fri, Apr 3, 2020 at 7:23 PM Ilia Mirkin <imirkin@...m.mit.edu> wrote:
> > >
> > > On Fri, Apr 3, 2020 at 1:21 PM Zeno Davatz <zdavatz@...il.com> wrote:
> > > >
> > > > On Fri, Apr 3, 2020 at 6:59 PM Ilia Mirkin <imirkin@...m.mit.edu> wrote:
> > > > >
> > > > > Ben -- probably the ACR changes in 5.6 don't fall back nicely anymore
> > > > > when there's no firmware? The load shouldn't be failed, just GR
> > > > > disabled...
> > > > >
> > > > > Zeno -- if you grab linux-firmware, it should be all better. Not sure
> > > > > if you're missing it on purpose or by accident.
> > > >
> > > > Thank you, Ilia
> > > >
> > > > I will try that on my Gentoo/Funtoo machine now. So far linux-firmware
> > > > was not needed with Kernel 5.5, so it was not installed on my machine.
> > >
> > > It was needed on 5.5 as well. It's just that it fell back gracefully
> > > without firmware, and you didn't get any acceleration features.
> >
> > Do I need any of these enabled for linux-firmware to load properly in
> > Kernel 5.6?
> >
> >  -*- Firmware loading facility
> >   │ │                                      ()    Build named firmware
> > blobs into the kernel binary
> >   │ │                                      [ ]   Enable the firmware
> > sysfs fallback mechanism
> >   │ │                                      [ ]   Enable compressed
> > firmware support
>
> Depends on distro specifics. Also the firmware has to be available at
> the time that nouveau loads. The corollary to this is:
>
> If it's built into the kernel, then the firmware must also be included
> in the kernel (since this happens before any FS stuff)
> If it's loaded as a module from initrd, then initrd must contain the firmware
>
> If you need help including firmware in the right place, a distro
> support channel is probably your best shot.
>
> Cheers,
>
>   -ilia