[Bug 93373] New: sometimes hickup with persistent garbaby

[Bug 93373] New: sometimes hickup with persistent garbaby

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=93373

            Bug ID: 93373
           Summary: sometimes hickup with persistent garbaby
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: minor
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: blade-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Created attachment 120498
  --> https://bugs.freedesktop.org/attachment.cgi?id=120498&action=edit
Screenshot just after the hickup

Version:

ii  xserver-xorg-v 1:1.0.12-1   amd64        X.Org X server -- Nouveau display

See attached screenshot. How it happens? Everything works normal (except for
some minor glitches like the substring "www." displayed in black-on-black
Terminator resp. Gnome Terminal).

But sometimes (once a week to every couple of days) and usually when Firefox is
in front, the screen suddenly displays lots of garbage. There are no errors in
Xorg.0.log. Usually the fonts in the main HTML area get weird or dots on them
and this stays even when the window is scrolled. Some page areas with other
fonts are sometimes also affected and they look even worse (covered in
stripes). The same applies to the GTK controls. (Note: I use thinice Gtk theme,
this fact might be related).

Anyhow, making Gtk redraw the controls (hover or click blindly) makes them
appear normal but not so with the fonts. Even when I restart Firefox, some tabs
still have areas (randomly!) with garbled letters.

Note: I had a similar issue with the previous version too but it was worse, it
also affected Terminator (Gnome Terminal renderer). Now Terminator seems to
stay unaffected, at least for now.

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[Bug 93373] sometimes hickup with persistent garbaby

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=93373

Eduard Bloch <blade-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #120498|text/plain                  |image/png
          mime type|                            |
 Attachment #120498|Screenshot just after the   |Screenshot right after the
        description|hickup                      |hickup

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[Bug 93373] sometimes hickup with persistent garbaby

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https://bugs.freedesktop.org/show_bug.cgi?id=93373

--- Comment #1 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
Please include dmesg and xorg log. Even if they don't contain errors, they will
contain information about your setup.

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[Bug 93373] sometimes hickup with persistent garbaby

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https://bugs.freedesktop.org/show_bug.cgi?id=93373

--- Comment #2 from Eduard Bloch <blade-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org> ---
Created attachment 120499
  --> https://bugs.freedesktop.org/attachment.cgi?id=120499&action=edit
dmesg

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[Bug 93373] sometimes hickup with persistent garbaby

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https://bugs.freedesktop.org/show_bug.cgi?id=93373

--- Comment #3 from Eduard Bloch <blade-8fiUuRrzOP0dnm+yROfE0A@public.gmane.org> ---
Created attachment 120500
  --> https://bugs.freedesktop.org/attachment.cgi?id=120500&action=edit
Xorg log

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[Bug 93373] GLAMOR triggers visual artifacts with nouveau GL backend

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https://bugs.freedesktop.org/show_bug.cgi?id=93373

Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|sometimes hickup with       |GLAMOR triggers visual
                   |persistent garbaby          |artifacts with nouveau GL
                   |                            |backend

--- Comment #4 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
OK, you're using a GM107, which means that you're *not* using
xf86-video-nouveau 1.0.12 since we dropped our GLAMOR integration (since it was
buggy). You're now using xf86-video-modesetting, which has a functioning GLAMOR
integration.

Unfortunately GLAMOR does something which makes nouveau very sad. I've found a
solution, but it's roughly equivalent to pouring cement into the piping. If
you'd like, you can patch your mesa build with

diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_vbo.c
b/src/gallium/drivers/nouveau/nvc0/nvc0_vbo.c
index c464904..b3b6627 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_vbo.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_vbo.c
@@ -976,6 +976,7 @@ nvc0_draw_vbo(struct pipe_context *pipe, const struct
pipe_draw_info *info)
    nvc0_update_prim_restart(nvc0, info->primitive_restart,
info->restart_index);

    if (nvc0->base.vbo_dirty) {
+      IMMED_NVC0(push, SUBC_3D(NV10_SUBCHAN_REF_CNT), 0);
       if (nvc0->screen->eng3d->oclass < GM107_3D_CLASS)
          IMMED_NVC0(push, NVC0_3D(VERTEX_ARRAY_FLUSH), 0);
       nvc0->base.vbo_dirty = false;

But I haven't the faintest clue why this helps. (I actually haven't tested on
Maxwell, but it helped on Kepler.)

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[Bug 93373] GLAMOR triggers visual artifacts with nouveau GL backend

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https://bugs.freedesktop.org/show_bug.cgi?id=93373

Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> changed:

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

--- Comment #5 from Martin Peres <martin.peres-GANU6spQydw@public.gmane.org> ---
-- 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/245.

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