On Sun, 24 Dec 2017, Adam Bennett wrote: > Alan, > > I have a Dell Precision 7520 with an Samsung SSD in addition to an NVMe > drive. I'm currently running 4.14.8 but have seen the below problem > since I moved from 4.9 to 4.13. > > When I boot without AC plugged in, the SSD is stopped almost immediately > in the boot process, not allowing the boot to continue. > > I can boot on fine on AC. When I unplug the cord, I see the "Stopping > disk" message, and the system is unresponsive until I plug the AC back in. > > I initially thought the problem was in user-space, but I set up > laptop-mode-tools to keep "control" as "on", and the problem still > persists. Also, I don't see the issue in 4.9. It's entirely possible that the problem does lie in userspace, during boot-up. Don't forget that your initramfs image could be causing this; have you tried to rebuild it with the new laptop settings? > I have temporarily worked around the problem by returning from > sd_suspend_runtime without calling sd_suspend_common in sd.c (obviously > not the true fix). > > I have tried a number of searches, and couldn't find any bug reports of > this nature, but I'm not that in-tune with the linux development process > to have searched all the correct places. This should be sent to the linux-pm and linux-scsi mailing lists (CC'ed). > I'd like to help track this problem down, do you have any suggestions or > is there some additional details I could provide? You can try bisecting between the 4.9 and 4.13 kernels to find the commit which first caused the problem. Alan Stern
