Hi All,

I'm sending this to the fedora-kernel and -devel lists both to get the kernel team aware of this and because it is not entirely clear to me how to best deal with this.

I guess we should get this added to the release-notes / common-bugs page for F28, but I'm not sure what the procedure is for that ?

I've just become aware that at least for some users the use of SATA LPM in F28 causes the Lenovo 50 series laptops (confirmed X250, T450s G50-80) freeze/ hang hard under certain conditions when using SATA LPM, independent of the disk used (*).

This is currently being tracked in: https://bugzilla.redhat.com/show_bug.cgi?id=1571330

A known workaround is to add: "ahci.mobile_lpm_policy=0" to the kernel boot command line.

Can someone help me to get this documented? Once we've figured out what is going on I hope to be able to fix this with a kernel update, but people may still need the workaround to install Fedora 28.

Also if people are using Fedora 28 on a 50 series Lenovo laptop without issues, please let me know. 3 independent reports points to a common problem, but maybe there is some other factor in play.

Regards,

Hans

*) So blacklisting disks by their model string which is the normal way to workaround LPM issues does not work.