Regression on >=gentoo-sources-6.17.0

[stefan11111]

Full title too long: Regression on >=gentoo-sources-6.17.0 regarding laptop_mode

On kernels >=gentoo-sources-6.17.0, laptop mode fails like this:

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# rc-service laptop_mode restart
 * Stopping laptop_mode ...
which: no logger in (/usr/libexec/rc/sbin:/usr/libexec/rc/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/opt/bin:/usr/lib/llvm/20/bin:/bin:/sbin:/usr/bin:/usr/sbin)
No logger command available
/usr/sbin/laptop_mode: line 172: [: too many arguments
/usr/share/laptop-mode-tools/modules/intel-sata-powermgmt: line 46: echo: write error: Operation not supported
/usr/share/laptop-mode-tools/modules/intel-sata-powermgmt: line 46: echo: write error: Operation not supported                                                                                                                           [ ok ]
 * Starting laptop_mode ...
which: no logger in (/usr/libexec/rc/sbin:/usr/libexec/rc/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:/opt/bin:/usr/lib/llvm/20/bin:/bin:/sbin:/usr/bin:/usr/sbin)
No logger command available
/usr/sbin/laptop_mode: line 172: [: too many arguments
/usr/share/laptop-mode-tools/modules/intel-sata-powermgmt: line 46: echo: write error: Operation not supported
/usr/share/laptop-mode-tools/modules/intel-sata-powermgmt: line 46: echo: write error: Operation not supported

The relevant part is

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/usr/share/laptop-mode-tools/modules/intel-sata-powermgmt: line 46: echo: write error: Operation not supported

This happens because writing to /sys/class/scsi_host/hostX/link_power_management_policy fails on kernels >=6.17.0
All the files are where they should be, and they have the proper contents, but they can't be written to:

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# ls -l /sys/class/scsi_host/*/link_power_management_policy
-rw-r--r-- 1 root root 4096 Nov  3 02:29 /sys/class/scsi_host/host0/link_power_management_policy
-rw-r--r-- 1 root root 4096 Nov  3 02:28 /sys/class/scsi_host/host1/link_power_management_policy
-rw-r--r-- 1 root root 4096 Nov  3 02:28 /sys/class/scsi_host/host2/link_power_management_policy

# cat /sys/class/scsi_host/*/link_power_management_policy
max_performance
max_performance
max_performance

# echo min_power > /sys/class/scsi_host/host0/link_power_management_policy
bash: echo: write error: Operation not supported

# echo max_performance > /sys/class/scsi_host/host0/link_power_management_policy
bash: echo: write error: Operation not supported

This is only a problem with kernels >= 6.17.0
This works properly on 6.16.12 and bellow.

6.16.12 config: http://0x0.st/KLWk.txt
6.17.0 config: http://0x0.st/KLWd.txt

[stefan11111]

Opened bug too: https://bugs.gentoo.org/965512