From: Bjorn Helgaas <helgaas@kernel.org>
To: Mario Limonciello <mario.limonciello@amd.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
"open list:PCI SUBSYSTEM" <linux-pci@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>,
"Rafael J . Wysocki" <rafael@kernel.org>,
Lukas Wunner <lukas@wunner.de>,
linux-pm@vger.kernel.org
Subject: Re: [PATCH] PCI/ASPM: Enable L0s/L1 for removable devices when BIOS didn't configure ASPM
Date: Tue, 5 May 2026 11:05:25 -0500 [thread overview]
Message-ID: <20260505160525.GA733339@bhelgaas> (raw)
In-Reply-To: <20260504225246.480921-1-mario.limonciello@amd.com>
On Mon, May 04, 2026 at 05:52:46PM -0500, Mario Limonciello wrote:
> When comparing lspci output between Windows and Linux for hotplugged
> Thunderbolt 5 eGPU devices, Windows enables ASPM L1 but Linux doesn't:
>
> Windows: LnkCtl: ASPM L1 Enabled
> Linux: LnkCtl: ASPM Disabled
>
> This difference in ASPM configuration can cause behavioral differences
> between the two operating systems for the same hardware.
A tangent, not a comment on the patch itself, but what sort of
behavioral differences are these? If ASPM is working correctly, the
only differences *should* be in power consumption and performance.
next prev parent reply other threads:[~2026-05-05 16:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-04 22:52 [PATCH] PCI/ASPM: Enable L0s/L1 for removable devices when BIOS didn't configure ASPM Mario Limonciello
2026-05-05 16:05 ` Bjorn Helgaas [this message]
2026-05-05 16:08 ` Mario Limonciello
2026-05-05 21:42 ` Bjorn Helgaas
2026-05-06 3:36 ` Mario Limonciello
2026-05-05 18:09 ` Rafael J. Wysocki
2026-05-06 4:53 ` Mika Westerberg
2026-05-06 15:10 ` Mario Limonciello
2026-05-06 15:27 ` Bjorn Helgaas
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