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Date: Fri, 1 May 2026 11:55:42 -0500
From: Bjorn Helgaas <helgaas@kernel.org>
To: Matthias Dittrich <dittrich.m@gmx.net>
Cc: bhelgaas@google.com, linux-pci@vger.kernel.org,
	regressions@lists.linux.dev,
	Ilpo =?utf-8?B?SsOkcnZpbmVu?= <ilpo.jarvinen@linux.intel.com>
Subject: Re: [REGRESSION] PCI BAR allocation/D3cold failure: NVIDIA MX250
 inaccessible since Kernel 6.x on Acer Swift 3 (SF314-56G)
Message-ID: <20260501165542.GA491695@bhelgaas>
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[+cc Ilpo]

On Fri, May 01, 2026 at 10:13:41AM +0200, Matthias Dittrich wrote:
> Dear Kernel Developers,
> 
> I found a regression and did my best to identify the issue and find a
> workaround, but I am not a developer. I also published the regression in the
> NVIDIA Linux Developer Forum, but it appears to be a kernel regression and
> not a driver issue, as the latest drivers work on older kernels (e.g., 5.15)
> but fail on anything 6.x+. I did not perform a git bisect as compiling on
> this i5-8265U - because of its low performance I can only compile one kernel
> over night.
> 
> **Description:**
> The NVIDIA MX250 GPU on Acer Swift 3 (SF314-56G / BIOS 1.14) is inaccessible
> on any Linux distribution using Kernel 6.x or 7.x. The device fails to
> initialize during the driver probe routine.

Thanks for the report.  With the newest kernel available to you, can
you please capture the complete dmesg and output of "sudo lspci -vv"?
Don't filter out things that don't seem relevant; we can easily do
that.

Bjorn