On Tue, May 24, 2022 at 12:05:08PM -0500, Mario Limonciello wrote: > Per AHCI spec v1.3.1, "7.3 Native Hot Plug Support", once LPM is > enabled hotplug support needs to be disabled. > > The LPM code always followed this and disabled the port when no > drives were connected, but as more machines will be exposed to > this code it might be an unexpected behavior to some users. > > Add a note to parameter documentation to explain the new behavior. > > Link: https://bugs.launchpad.net/bugs/1971576 > Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx> > --- > Documentation/admin-guide/kernel-parameters.txt | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt > index 9e6bd212004d..4dcd9a3ba4a5 100644 > --- a/Documentation/admin-guide/kernel-parameters.txt > +++ b/Documentation/admin-guide/kernel-parameters.txt > @@ -279,6 +279,13 @@ > 3 => Medium power with Device Initiated PM enabled > 4 => Minimum power > > + NOTE: Enabling LPM when no drive is connected will disable > + the port which means hotplug will not work. > + > + If hotplug is an important use case, this can be modified This has two overly long lines.
