Red Hat Bugzilla – Bug 1303262
Kernel suspend issues on 4.5-rc0 (regression)
Last modified: 2016-02-18 19:37:03 EST
Description of problem:
On a Dell XPS 13 laptop (9350) using the newest kernel 4.5-rc1 (named 4.5.0-0.rc1.git0.2) the laptop will come back immediately from suspend (close the lid, suspends and it comes back after 1 second).
This also creates some issues with bluetooth (can't connect anymore for some misterious reason, not relevant).
It works well using 4.5-rc0
Notes: I'm using Fedora 23 but rawhide kernel, cause my laptop is too new and unsupported on older kernels (at least without tweaks).
I have more infornation!
Last kernel known to work well is: kernel-4.5.0-0.rc0.git1.2.fc24.x86_64
Next kernel that doesn't suspend the computer: kernel-4.5.0-0.rc0.git5.1.fc24.x86_64
I couldn't try any other releases in between since they failed according to koji (http://koji.fedoraproject.org/koji/packageinfo?packageID=8)
I have a dmesg trace, in this trace I send the computer to sleep after second 26 (more or less). Attached.
Created attachment 1121943 [details]
Ok I'm closing this.
After trying to bisect the kernel with little luck (I got inconsistent results with the same commit) and some other hardware madness going on I think it might be connected to the Dell firmware.
After upgrading to BIOS 1.2.3 seems that the problem has gone away. It suspends well with 4.5.0-rc4-git8 or so and it does it way faster than before (regardless of the kernel version) so I guess the Dell guys have fixed some of the bugs there.