On 23-09-2022 00:08, Damien Le Moal wrote: > On 9/21/22 21:38, J.J. Berkhout wrote: >> Hello, >> >> >> >> On 21-09-2022 13:58, Niklas Cassel wrote: >>> Another way do disable lpm is to do: >>> >>> $ ls -al /sys/class/scsi_host/host* >>> >>> Find your device in the list. My device is: >>> /sys/class/scsi_host/host13/ >>> >>> Print the current lpm policy for your device: >>> $ cat /sys/class/scsi_host/host13/link_power_management_policy >>> med_power_with_dipm >>> >>> Anything other than "max_performance" means that you have (a varying degree) >>> of low power modes enabled. >>> >>> $ sudo sh -c "echo max_performance > /sys/class/scsi_host/host13/link_power_management_policy" >>> >>> $ cat /sys/class/scsi_host/host13/link_power_management_policy >>> max_performance >>> >>> Try reading from the optical drive after ensuring that the policy is >>> "max_performance". >>> >> >> Yes, this worked and did the trick! Reading without any errors. I did >> not yet try to write, but will do so today. >> When booting with libata.force=nolpm the link_power_management_policy >> was still med_power_with_dipm and I got the dmesg: >> >> [ 0.291452] ata: failed to parse force parameter "nolpm" (unknown value) > > What kernel version are you running ? This should work with the latest > kernels. Your kernel likely pre-dates the addition of all the ata horkage > flag as boot parameter options, which I think was with 5.18 kernel. Yep, I run Ubuntu 5.15.0-48-generic kernel. I circumvented this by using sysfsutils with class/scsi_host/host0/link_power_management_policy = max_performance in the /etc/sysfs.conf file. As long as I don't mess around with my hardware, the host number should stay the same. Kind regards, Jaap Berkhout
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