linux-kernel - Re: Regression from "ACPI: OSI: Remove Linux-Dell-Video _OSI string"? (was: Re: Bug#1036530: linux-signed-amd64: Hard lock up of system)

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Date:   Thu, 1 Jun 2023 18:33:07 +0200
From:   Karol Herbst <kherbst@...hat.com>
To:     "Limonciello, Mario" <mario.limonciello@....com>
Cc:     Nick Hastings <nicholaschastings@...il.com>,
        Lyude Paul <lyude@...hat.com>, Lukas Wunner <lukas@...ner.de>,
        Salvatore Bonaccorso <carnil@...ian.org>,
        1036530@...s.debian.org, "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: Regression from "ACPI: OSI: Remove Linux-Dell-Video _OSI string"?
 (was: Re: Bug#1036530: linux-signed-amd64: Hard lock up of system)

On Thu, Jun 1, 2023 at 6:18 PM Limonciello, Mario
<mario.limonciello@....com> wrote:
>
> +Lyude, Lukas, Karol
>
> On 5/31/2023 6:40 PM, Nick Hastings wrote:
> > Hi,
> >
> > * Nick Hastings <nicholaschastings@...il.com> [230530 16:01]:
> >> * Mario Limonciello <mario.limonciello@....com> [230530 13:00]:
> > <snip>
> >>> As you're actually loading nouveau, can you please try nouveau.runpm=0 on
> >>> the kernel command line?
> >> I'm not intentionally loading it. This machine also has intel graphics
> >> which is what I prefer. Checking my
> >> /etc/modprobe.d/blacklist-nvidia-nouveau.conf
> >> I see:
> >>
> >> blacklist nvidia
> >> blacklist nvidia-drm
> >> blacklist nvidia-modeset
> >> blacklist nvidia-uvm
> >> blacklist ipmi_msghandler
> >> blacklist ipmi_devintf
> >>
> >> So I thought I had blacklisted it but it seems I did not. Since I do not
> >> want to use it maybe it is better to check if the lock up occurs with
> >> nouveau blacklisted. I will try that now.
> > I blacklisted nouveau and booted into a 6.1 kernel:
> > % uname -a
> > Linux xps 6.1.0-9-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.27-1 (2023-05-08) x86_64 GNU/Linux
> >
> > It has been running without problems for nearly two days now:
> > % uptime
> >   08:34:48 up 1 day, 16:22,  2 users,  load average: 1.33, 1.26, 1.27
> >
> > Regards,
> >
> > Nick.
>
> Thanks, that makes a lot more sense now.
>
> Nick, Can you please test if nouveau works with runtime PM in the
> latest 6.4-rc?
>
> If it works in 6.4-rc, there are probably nouveau commits that need
> to be backported to 6.1 LTS.
>
> If it's still broken in 6.4-rc, I believe you should file a bug:
>
> https://gitlab.freedesktop.org/drm/nouveau/
>
>
> Lyude, Lukas, Karol
>
> This thread is in relation to this commit:
>
> 24867516f06d ("ACPI: OSI: Remove Linux-Dell-Video _OSI string")
>
> Nick has found that runtime PM is *not* working for nouveau.
>

keep in mind we have a list of PCIe controllers where we apply a
workaround: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/nouveau/nouveau_drm.c?h=v6.4-rc4#n682

And I suspect there might be one or two more IDs we'll have to add
there. Do we have any logs? And could anybody test if adding the
controller in play here does resolve the problem?

> If you recall we did 24867516f06d because 5775b843a619 was
> supposed to have fixed it.
>