On Tue, May 30, 2017 at 11:44 AM, Martin Michlmayr <t...@cyrius.com> wrote: > * Fede <be...@ieee.org> [2017-02-25 20:31]: >> I have a Dell XPS 15 9550. I first installed Debian Stretch mid >> January and after installation I could suspend and resume my laptop >> by closing the lid. Since the recent kernel update the laptop >> doesn't resume from suspend. Instead it just reboots. > > Do you still see this problem? > > I saw something similar yesterday with linux-image-4.9.0-3-amd64 > (4.9.25-1) on a Dell XPS 13 9350. Instant reboot after opening the > lid. I booted into Debian, suspended, opened the lid and got a reboot > again. This happened about 2-3 times and then suspend starting > working and is still working so far. > > So while I was able to trigger it reliable 2-3 times, it's working > again (and I never had any problems during the last 2 months).
With kernel versions 4.9.0-2-amd64 and 4.9.0-3-amd64 the laptop (not connected to a docking station) resumes as expected. Unfortunately I still have many problems, but all related to the use of a docking station, a Dell WD15. With kernel 4.9.0-2-amd64 hot-plugging or disconnecting the docking station most of the time results in a kernel freeze. Suspend and resume kind of works, but only if the monitor input is always listening for the port where the docking station is connected. If the monitor switches port (automatic signal lookup) I end up with a blank screen and need to use the power button. With kernel 4.9.0-3-amd64 the use of the docking station is totally impractical as half of the times I try to suspend and resume I get a blank screen and have to use the power button. In fact I reverted to 4.9.0-2-amd64 for the time being. To try to find out if the problems are caused by the kernel or by the docking station firmware (latest available version with BIOS 1.2.25), I tested an Ubuntu 17.04 live image which has a newer kernel of the line 4.10. With it everything works as expected: suspend, resume, hot-plugging and disconnecting (both while active as well as while in suspend mode) and I can switch monitor input without fear. My conclusion is that the problems are caused by the current kernel used in Debian testing. Regards, Fede
