Nouveau - Sep 2016 - [Bug 97588] New: Disconnecting/Reconnecting monitor results in 'laggy' graphics and disappearing mouse cursor

https://bugs.freedesktop.org/show_bug.cgi?id=97588

            Bug ID: 97588
           Summary: Disconnecting/Reconnecting monitor results in
'laggy'
                    graphics and disappearing mouse cursor
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: rik at mief.nl
        QA Contact: xorg-team at lists.x.org

Created attachment 126188
  --> https://bugs.freedesktop.org/attachment.cgi?id=126188&action=edit
kernel_log

Overview:
Whenever I disconnect or reconnect my monitor via HDMI or switch systems with
my HDMI switcher, the screen seems to be laggy and my mouse cursor won't
move.
There seems to be input from the mouse as I can use the 'hidden' cursor
to log
out and log back in which resolves the issue.

I can only describe the effect as being extremely laggy. In chrome I can see
that tabs change, however content won't show. I can type in the terminal but
only see some letters appearing (really slowly and random).

Steps to Reproduce:

1) Disconnect HDMI cable
2) Reconnect

Actual Results:
Slow and unusable screen

Expected Results:
Usable screen

Hardware:
NVIDIA Corporation GM206 [GeForce GTX 960]

Software:
Fedora 24
Kernel 4.7.2-201.fc24.x86_64

X.Org X Server 1.18.4
Release Date: 2016-07-19
X Protocol Version 11, Revision 0
Build Operating System:  4.6.4-301.fc24.x86_64 
Current Operating System: Linux ElGuapo 4.7.2-201.fc24.x86_64 #1 SMP Fri Aug 26
15:58:40 UTC 2016 x86_64
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.7.2-201.fc24.x86_64
root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap
rhgb quiet log_buf_len=1M
Build Date: 25 August 2016  05:27:31PM
Build ID: xorg-x11-server 1.18.4-4.fc24 
Current version of pixman: 0.34.0

xorg-x11-drv-nouveau
Version     : 1.0.12
Release     : 4.fc24

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--- Comment #1 from rik at mief.nl ---
Created attachment 126189
  --> https://bugs.freedesktop.org/attachment.cgi?id=126189&action=edit
Xorg.0.log

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--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Can you see if your interrupt rate goes through the roof? You can see in
/proc/interrupts. Is the attached kernel log from after the issue happens?

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--- Comment #3 from rik at mief.nl ---
Created attachment 126192
  --> https://bugs.freedesktop.org/attachment.cgi?id=126192&action=edit
interrupts_before

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--- Comment #4 from rik at mief.nl ---
Created attachment 126193
  --> https://bugs.freedesktop.org/attachment.cgi?id=126193&action=edit
interrupts after

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--- Comment #5 from rik at mief.nl ---
The log is indeed after the issue occurred. I have added a cat of the
interrupts before and after.

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--- Comment #6 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Hm, 300 interrupts is hardly what I call a storm. Maybe with 3 or 4 more 0's
on
it...

Try booting with

nouveau.debug=debug drm.debug=14

and see if that reveals anything interesting.

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--- Comment #7 from rik at mief.nl ---
Created attachment 126194
  --> https://bugs.freedesktop.org/attachment.cgi?id=126194&action=edit
kernel_log with debugging

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--- Comment #8 from rik at mief.nl ---
Created attachment 126195
  --> https://bugs.freedesktop.org/attachment.cgi?id=126195&action=edit
Xorg.0.log debug

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--- Comment #9 from rik at mief.nl ---
I am now booted with debugging on and attached the dmesg output and Xorg.0.log
after I have unplugged and reconnected the monitor.

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--- Comment #10 from Ilia Mirkin <imirkin at alum.mit.edu> ---
And no messages are constantly repeating in "steady state"? If not, I
got
nothing. Otherwise we're not properly clearing some interrupt state. I do
see

nouveau 0000:01:00.0: disp: DAC1 sense: 80100000

a whole bunch. Which reminds me - there was some userspace application that
kept polling and repolling connector state and messing things up. Perhaps the
unplug/plug activates it in your desktop environment?

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--- Comment #11 from rik at mief.nl ---
I am not sure how I can check for messages that are constantly repeating in
"steady state". I can provide a list of running apps if that helps at
all. But
it is a pretty clean installation (or at least I think so :P ).

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--- Comment #12 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Once you get to a messed up state, ssh in from another machine and run

dmesg -w

And see if new messages keep appearing. If they do, I'd be curious which
ones.

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--- Comment #13 from rik at mief.nl ---
There does not seem to be any new messages popping up with dmesg -w.

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--- Comment #14 from rik at mief.nl ---
Ok cool, I have a horrible work around! I installed Arandr, now if I disconnect
the monitor and reconnect, the graphics are screwed up (laggy and does not seem
to be updated).

If I then just do a ctrl-return in Arandr (apply settings) all is back to
normal.

Does this maybe give a clue of what happens? I wonder if there is a way of
connecting a script to the reconnect event to do this underwater. It ain't
pretty but at least it is somewhat workable.

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--- Comment #15 from Karol Herbst <karolherbst at gmail.com> ---
uhh I remember. At work on a xfce4 machine we also have troubles with a laptop
+ 2 external monitors on an AMD gpu. After login all screens are black and
sometimes when reconnecting screens we have really bad artefacts on one of
them.

Maybe this is a xfce4 issue?

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--- Comment #16 from rik at mief.nl ---
Hmm, it does start to look like this is a XFCE bug instead of nouveau. I'll
try
and see what happens with another DE. Thanks for all the responses so far, I
actually learned a lot.

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--- Comment #17 from rik at mief.nl ---
I think this can be closed as it does seem to be a XFCE bug rather than
nouveau. I have confirmed that KDE/openbox do work when switching or
disconnecting the monitor. 

For future reference, when people have the same issue I would recommend
creating a keyboard shortcut that loads an Arandr script. (mine is at
win+alt+pause). Thanks for the responses and help figuring this out.

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--- Comment #18 from poma <pomidorabelisima at gmail.com> ---
(In reply to Karol Herbst from comment #15)
> uhh I remember. At work on a xfce4 machine we also have troubles with a
> laptop + 2 external monitors on an AMD gpu. After login all screens are
> black and sometimes when reconnecting screens we have really bad artefacts
> on one of them.
> 
> Maybe this is a xfce4 issue?
Have you considered the possibility to report the issue here:
https://bugzilla.xfce.org/buglist.cgi?component=Display%20Settings&product=Xfce4-settings

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Martin Peres <martin.peres at free.fr> changed:

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

--- Comment #19 from Martin Peres <martin.peres at free.fr> ---
-- GitLab Migration Automatic Message --

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