4.16.0+ UBUNTU hangs at login (4.16.0-rc7+ did not) on AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx

[m-r-s]

When I boot with the UBUNTU version of the 4.16.0+ kernel my HP envy x360 15-bq102ng hangs before Ubuntu 17.10 can be fully loaded. This is/was not the case with the last RC (4.16.0-rc7+) of the kernel. I am using the current padoka stable ppa (mesa 18.0.0)

[mezcalbert]

I've also had a lot of trouble with padoka ppa (either latest or stable) and amdgpu lately. Could you try with oibaf ppa? And if it's stuck, don't hesitate to go to tty (if possible), and either kill Xwayland, gdm, gnome-session or Xorg, this way I usually manage to login after a couple of tries.

[m-r-s]

Yes, I can try oibaf later. I cannot do anything if it's stuck, only press the power button 4s.

[m-r-s]

With the oibaf ppa I experience exactly the same behavior.

[mezcalbert]

If you purged padoka ppa before trying it, I guess your issue is unrelated to mine then and would need to be solved differently.

[m-r-s]

Yes, I purged the padoka ppa with ppa-purge before using the oibaf one.

[m-r-s]

I upgraded to Bionic (purged all ppas before) and find still the same behavior

[M-Bab]

Do you have any log infos you can provide (like lastlog)?

[CRTX]

Just wanted to confirm in that 4.16+ Ubuntu from this repository also has the same behavior with my 2500U. However, if I use the mainline 4.16 kernel my laptop works perfectly fine...

[m-r-s]

Here is what I found in /var/log/kern.log Can I provide anything else which could be interesting?

kern.log

[m-r-s]

I can confirm that the latest Ubuntu mainline kernel 4.16.0 (drm-next) works for me as well.

marc@snapbug:~$ uname -a Linux snapbug 4.16.0-996-generic #201803282201 SMP Thu Mar 29 02:05:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

[m-r-s]

Kernel 4.16.2+ boots again as expected :)