Re: [bug report] ata: ahci: IO error with the default med_power_with_dipm

[Niklas Cassel <cassel@kernel.org>]

On Fri, Nov 21, 2025 at 03:35:02PM +0800, Yihang Li wrote:
> Hello Mario, Damien,
> 
> After commit 5433f0e7427ae ("ata: Kconfig: Update SATA_MOBILE_LPM_POLICY
> default to med_power_with_dipm") from linux v6.11, I am seeing the error,
> and eventually, my file system became read-only and could no longer
> be used. Please help check whether this is reasonable and how to resolve
> this issue?
> 
> I am using an standard AHCI controller, connected to a SATA disk, and
> using this disk as the system drive.
> 
> # lsblk
> NAME               MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTS
> sda                  8:0    0 447.1G  0 disk 
> ├─sda1               8:1    0   600M  0 part /boot/efi
> ├─sda2               8:2    0     1G  0 part /boot
> └─sda3               8:3    0 445.5G  0 part 
>   ├─openeuler-root 252:0    0    70G  0 lvm  /
>   ├─openeuler-swap 252:1    0     4G  0 lvm  [SWAP]
>   └─openeuler-home 252:2    0 371.5G  0 lvm  /home
> 
> Any suggestions on the problem are welcome.

Hello Yihang Li,

As far as we can tell, it appears that a lot of vendors have not
implemented LPM properly, or have issues with LPM in their firmware.

The way we solve it is to quirk these broken devices, see e.g.:
https://github.com/torvalds/linux/blob/v6.18-rc6/drivers/ata/libata-core.c#L4209-L4213


Please tell us which the model of your drive:

$ lsblk -o MODEL /dev/sdX

and the firmware version
$ lsblk -o REV /dev/sdX


So we can create a quirk.


It would also be helpful if you could share which AHCI adapter you are using:
$ lspci -nn | grep -i ahci
$ lspci -nn | grep -i sata


If you want to verify that disabling LPM works for your drive, you can add:

libata.force=nolpm on the kernel command line.


Kind regards,
Niklas