[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

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https://bugs.freedesktop.org/show_bug.cgi?id=106199

            Bug ID: 106199
           Summary: Cannot get back into DM after logoff (Linux 4.16.2+)
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: mabo@elbmurf.de

Created attachment 139031
  --> https://bugs.freedesktop.org/attachment.cgi?id=139031&action=edit
LightDM ant soccer

Starting with Linux 4.16.2, when I logoff from KDE Plasma, I don’t get back
into SDDM (just a black screen) or back into LightDM (wild random blocky
screen, see attachment).
I have a RX 580, DC is on. Same result on Linux 4.17rc2. Distro is
Antergos/Arch. Monitor is connected via DP.
Using SDDM, I can press ctrl + alt + F1 etc. to theoretically get to a tty
prompt but the screen does stay black. But then, after pressing ctrl + alt +
del numerous times, at least my system does a proper reboot. In LightDM, this
does not work and I have to use the reset button. Worked with Linux 4.16.1
before.

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[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

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https://bugs.freedesktop.org/show_bug.cgi?id=106199

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Does https://patchwork.freedesktop.org/patch/217764/ help?

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[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

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https://bugs.freedesktop.org/show_bug.cgi?id=106199

--- Comment #2 from Maximilian Böhm <mabo@elbmurf.de> ---
Applied the patch to Linux 4.17rc2, same problem.

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[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

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https://bugs.freedesktop.org/show_bug.cgi?id=106199

Konrad Wojtoń <kondzik.w@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kondzik.w@gmail.com

--- Comment #3 from Konrad Wojtoń <kondzik.w@gmail.com> ---
Created attachment 139145
  --> https://bugs.freedesktop.org/attachment.cgi?id=139145&action=edit
Xorg.0.log after crash

I have exactly the same blocky screen after logoff in SDDM with kernel 4.16.4
and RX 460. Xorg.0.log.amdgpu_logoff_crash contains xorg logs after crash.
Distro is gentoo, I have 3 screens connected to RX 460 - all get blocky screen.

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[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

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https://bugs.freedesktop.org/show_bug.cgi?id=106199

--- Comment #4 from Öyvind Saether <oyvinds@everdot.org> ---
I have the exact same problem on Fedora 28 with kernels 4.16.4 and 4.17rc2 and
amdgpu.dc=1 on who different systems, one with a RX 560 and one with a RX 580.
Both use DP.
>start computer, get lightdm, login to XFCE
>logout
>computer frozen
My solution as of now is to use amdgpu.dc=0 which doesn't have this problem.

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[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

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https://bugs.freedesktop.org/show_bug.cgi?id=106199

--- Comment #5 from Öyvind Saether <oyvinds@everdot.org> ---
Created attachment 139195
  --> https://bugs.freedesktop.org/attachment.cgi?id=139195&action=edit
some kind of modern art by amdgpu.dc=1 upon logging out back into lightdm

Tried again on the RX580 box with amdgpu.dc=1. Computer did NOT freeze but
display did turn into some modern art project. ssh in shows this in the xorg
log
[   748.979] (EE) modeset(0): failed to set mode: Invalid argument
[   749.548] (II) modeset(0): Disabling kernel dirty updates, not required.
and nothing in dmesg.

interestingly service lightdm restart did bring it back up normally. logging
out again after that produced another pretty artistic ant-hive picture.

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[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

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https://bugs.freedesktop.org/show_bug.cgi?id=106199

--- Comment #6 from Öyvind Saether <oyvinds@everdot.org> ---
two more notes.

a) my desktop with rx 470 and 3x4k monitors (HDMI/DP/DP) does not have this
problem with amdgpu.dc=1 and kernel 4.16.4.

b) my htpc with 2400g and rx 560 and one screen connected with DP totally has
this problem with both 4.16.4 and 4.17rc2, logging out from xfce does not load
lightdm correctly; instead screen turns into some sort of modern art. When this
happens I can't switch to terminal with ctrl-alt-f2 BUT if I 1) turn the screen
off 2) turn it on again then I can get to a terminal by ctrl-alt-f2 and go back
to lightdm with ctrl-alt-f1 and it shows correctly and normally instead of
modern art.

c) I tried attaching another monitor to the rx 560 and both monitors turned
into modern art upon logout. I just tried this to see if number of monitors
matters. There's some reason one box with rx470 works fine and two with rx560
and rx580 have this problem.

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[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

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https://bugs.freedesktop.org/show_bug.cgi?id=106199

Öyvind Saether <oyvinds@everdot.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |WORKSFORME

--- Comment #7 from Öyvind Saether <oyvinds@everdot.org> ---
I don't seem to have this problem with
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git from 20
minutes ago. Booted with that git and no problem logging in and out again.
Rebooted with 4.17rc2, problem. Rebooted again with git, no problem.

I'm guessing it's this that fixed it,
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0f940fac655d5a728bc5ef6204d2ec4c3b3ea6c3

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[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

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https://bugs.freedesktop.org/show_bug.cgi?id=106199

--- Comment #8 from Maximilian Böhm <mabo@elbmurf.de> ---
I can confirm, works again on Linux 4.17 RC3.
But label this bug RESOLVED WORKSFORME is the wrong attitude. It needs to get
fixed in 4.16 too.

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[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

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https://bugs.freedesktop.org/show_bug.cgi?id=106199

--- Comment #9 from Maximilian Böhm <mabo@elbmurf.de> ---
BTW, 4.17 RC3 does not bring back my DP monitor after I have turned it off, so
this situation is by far not hunky-dory.

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[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

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https://bugs.freedesktop.org/show_bug.cgi?id=106199

--- Comment #10 from Harry Wentland <harry.wentland@amd.com> ---
A fix should land in 4.16 stable soon:
https://www.spinics.net/lists/stable-commits/msg86375.html

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[Bug 106199] Cannot get back into DM after logoff (Linux 4.16.2+)

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https://bugs.freedesktop.org/show_bug.cgi?id=106199

--- Comment #11 from Konrad Wojtoń <kondzik.w@gmail.com> ---
Linux 4.16.7 fixed issue for me.

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