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Date:   Thu, 1 Jun 2023 11:18:02 -0500
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Subject: Re: Regression from "ACPI: OSI: Remove Linux-Dell-Video _OSI string"?
 (was: Re: Bug#1036530: linux-signed-amd64: Hard lock up of system)
To:     Nick Hastings <nicholaschastings@gmail.com>,
        Lyude Paul <lyude@redhat.com>, Lukas Wunner <lukas@wunner.de>,
        kherbst@redhat.com
Cc:     Salvatore Bonaccorso <carnil@debian.org>, 1036530@bugs.debian.org,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Len Brown <lenb@kernel.org>, linux-acpi@vger.kernel.org,
        linux-kernel@vger.kernel.org, regressions@lists.linux.dev
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From:   "Limonciello, Mario" <mario.limonciello@amd.com>
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+Lyude, Lukas, Karol

On 5/31/2023 6:40 PM, Nick Hastings wrote:
> Hi,
>
> * Nick Hastings <nicholaschastings@gmail.com> [230530 16:01]:
>> * Mario Limonciello <mario.limonciello@amd.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.

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