Nouveau - May 2017 - [Bug 101191] New: [NVC3] Vsync stops working after mode changes in nouveau DDX

https://bugs.freedesktop.org/show_bug.cgi?id=101191

            Bug ID: 101191
           Summary: [NVC3] Vsync stops working after mode changes in
                    nouveau DDX
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: z411 at omaera.org
        QA Contact: xorg-team at lists.x.org

Hello,

I've encountered this weird issue where Vsync suddenly stops working after I
manipulate modes on the fly in some situations.

I could reproduce it in 4 different situations, and I've attached logs
respectively:

(1) Only 1 monitor connected to DVI. Any mode change (resolution or refresh
rate) will trigger the issue. (term_1.txt / xorg_1.txt)
(2) 2 monitors connected (DVI+HDMI TV). Turning off the DVI monitor will
immediately trigger the issue. (term_2.txt / xorg_2.txt)
(3) 2 monitors connected (DVI+HDMI TV). Mode changes in DVI monitor won't
trigger the issue anymore. But after turning off the HDMI monitor, mode changes
in the DVI one will start triggering the issue again. (term_3.txt / xorg_3.txt)
(4) 2 monitors connected (DVI+HDMI TV). Mode changes in HDMI monitor
immediately trigger the issue. Note how Vsync is still working in the DVI one,
though. (term_4.txt / xorg_4.txt)

Needless to say, this will cause issues (for example) in mpv video player,
where it'll suffer tearing and complain about inconsistent timing, both in
opengl and vdpau modes.

Distribution Debian Sid
Linux 4.9.25
xorg 7.7 (server 1.19.3)
xf86-video-nouveau 1.0.15
libdrm 2.4.74

This only happens with the nouveau DDX driver, as this issue doesn't occur
with
the modesetting one, therefore I assume it's a nouveau DDX bug (rather than
mesa).

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<https://lists.freedesktop.org/archives/nouveau/attachments/20170525/15dc9a5f/attachment.html>

https://bugs.freedesktop.org/show_bug.cgi?id=101191

--- Comment #1 from z411 at omaera.org ---
Created attachment 131513
  --> https://bugs.freedesktop.org/attachment.cgi?id=131513&action=edit
dmesg

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<https://lists.freedesktop.org/archives/nouveau/attachments/20170525/dcebe7d0/attachment.html>

https://bugs.freedesktop.org/show_bug.cgi?id=101191

--- Comment #2 from z411 at omaera.org ---
Created attachment 131514
  --> https://bugs.freedesktop.org/attachment.cgi?id=131514&action=edit
Terminal logs of 4 situations

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<https://lists.freedesktop.org/archives/nouveau/attachments/20170525/8428a3ed/attachment.html>

https://bugs.freedesktop.org/show_bug.cgi?id=101191

--- Comment #3 from z411 at omaera.org ---
Created attachment 131515
  --> https://bugs.freedesktop.org/attachment.cgi?id=131515&action=edit
xorg log

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<https://lists.freedesktop.org/archives/nouveau/attachments/20170525/b0e09352/attachment.html>

https://bugs.freedesktop.org/show_bug.cgi?id=101191

Eric Engestrom <fdo-bugs at engestrom.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|                            |102003


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=102003
[Bug 102003] Mesa demos doesn't compile due to gles1
-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<https://lists.freedesktop.org/archives/nouveau/attachments/20170801/03820205/attachment.html>

https://bugs.freedesktop.org/show_bug.cgi?id=101191

Eric Engestrom <fdo-bugs at engestrom.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Depends on|102003                      |


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=102003
[Bug 102003] Mesa demos doesn't compile due to gles1
-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<https://lists.freedesktop.org/archives/nouveau/attachments/20170801/47abdb25/attachment.html>

https://bugs.freedesktop.org/show_bug.cgi?id=101191

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

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

--- Comment #4 from Martin Peres <martin.peres at free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance:
https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/issues/349.

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<https://lists.freedesktop.org/archives/nouveau/attachments/20191204/b9a538b4/attachment.html>