Verification:
(initramfs) cd /sys/class/sas_phy/phy-0\:0\:20
(initramfs) 
(initramfs) cat negotiated_linkrate 
12.0 Gbit
(initramfs) echo 0 > enable
[   42.507684] hisi_sas_v3_hw 0000:74:02.0: phydown: phy0 phy_state=0xfe
[   42.558239] hisi_sas_v3_hw 0000:74:02.0: erroneous completion iptt=4048 
task=(____ptrval____) dev id=1 CQ hdr: 0x1103 0x10fd0 0x0 0x20000 Error info: 
0x0 0x4000000 0x0 0x0
[   42.573527] sas: smp_execute_task_sg: task to dev 500e004aaaaaaa1f response: 
0x0 status 0x2
(initramfs) [   42.583264] sas: ex 500e004aaaaaaa1f phy20 change count has 
changed

(initramfs) echo 0 > enable
(initramfs) cat negotiated_linkrate 
Phy disabled


** Tags removed: verification-needed-disco
** Tags added: verification-done-disco

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https://bugs.launchpad.net/bugs/1830435

Title:
  libsas: old linkrate advertised after phy disabled

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