On 1/31/24 20:49, Niklas Cassel wrote: > On Wed, Jan 31, 2024 at 04:38:28PM +0900, Damien Le Moal wrote: >> On 1/31/24 16:29, Dieter Mummenschanz wrote: >>> Damien, >>> so I've applied the patch to 6.8-rc2. Interesting thing is that the behaviour is >>> exactly the same as before (w/o the patch). Besides not >>> honoring CONFIG_SATA_MOBILE_LPM_POLICY=3 after boot my system refuses to >>> transition into lower power states > pc2 after resume even after letting it sit >>> idle for 10 minutes. Transition is only reached after issuing hdparm -Y. So if >>> the patch restores the original behaviour then why did it stop working?! > > Hello Dieter, > > Just to confirm, > while testing Damien's patch on top of 6.8-rc2, > did you still do: > > for foo in /sys/class/scsi_host/host*/link_power_management_policy; > do echo med_power_with_dipm > $foo; > done > > It should be needed until we add (or modify the existing entry, if any) > your PCI vendor and device id to use "board_ahci_low_power" instead of > "board_ahci", see e.g. > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/ata/ahci.c?id=b8b8b4e0c052b2c06e1c4820a8001f4e0f77900f Indeed. What is the AHCI adapter here ? It would be interesting if it is a Tiger Lake :) -- Damien Le Moal Western Digital Research
