linux-kernel - Re: Regression from 7627a0edef54 ("ata: ahci: Drop low power policy board type") on reboot (but not cold boot)

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Message-ID: <5fe0557a-b9ec-4600-a10f-20c494aa2339@grabatoulnz.fr>
Date: Tue, 18 Mar 2025 01:04:48 +0100
From: Eric <eric.4.debian@...batoulnz.fr>
To: Niklas Cassel <cassel@...nel.org>, Hans de Goede <hdegoede@...hat.com>
Cc: Salvatore Bonaccorso <carnil@...ian.org>,
 Mario Limonciello <mario.limonciello@....com>,
 Christoph Hellwig <hch@...radead.org>,
 Mika Westerberg <mika.westerberg@...ux.intel.com>,
 Damien Le Moal <dlemoal@...nel.org>, Jian-Hong Pan <jhp@...lessos.org>,
 regressions@...ts.linux.dev, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org, linux-ide@...r.kernel.org,
 Dieter Mummenschanz <dmummenschanz@....de>
Subject: Re: Regression from 7627a0edef54 ("ata: ahci: Drop low power policy
 board type") on reboot (but not cold boot)

Hi Niklas, hi Hans,

Le 17/03/2025 à 20:15, Eric a écrit :
> Hi Niklas,
>
> Le 17/03/2025 à 18:09, Niklas Cassel a écrit :
>>
>> I sent a patch that implements your original suggestion here:
>> https://lore.kernel.org/linux-ide/20250317170348.1748671-2-cassel@kernel.org/ 
>>
>>
>> I forgot to add your Suggested-by tag.
>> If the patch solves Eric's problem, I could add the tag when applying.
> I'll report back when the kernel with your proposed patch is built and 
> tested on my system.

The test is a success as far as I am concerned. With this new patch, 
DIPM is disabled on the Samsung SSD, but not the Maxtor disk on the same 
controller :


(trixieUSB)eric@...ihir:~$ sudo hdparm -I 
/dev/disk/by-id/ata-Samsung_SSD_870_QVO_2TB_S5RPNF0T419459E | grep 
"interface power management"
             Device-initiated interface power management
(trixieUSB)eric@...ihir:~$ sudo hdparm -I 
/dev/disk/by-id/ata-MAXTOR_STM3250310AS_6RY2WB82 | grep "interface power 
management"
        *    Device-initiated interface power management


and the SSD is successfully detected at reboot by both the UEFI and the 
linux kernel.

>>
>> Kind regards,
>> Niklas

Kind regards

Eric