[Bug 108095] Window becomes partially transparent for short time

[Bug 108095] Window becomes partially transparent for short time

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=108095

            Bug ID: 108095
           Summary: Window becomes partially transparent for short time
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: pmenzel+bugs.freedesktop@molgen.mpg.de

Created attachment 141774
  --> https://bugs.freedesktop.org/attachment.cgi?id=141774&action=edit
(manually edited) screenshot showing the problem

With Linux 4.14.55 and 4.19-rc5 (drm-tip), Xfce 4.13 and the Radeon device
below, a user reports, that sometimes parts of the terminal window (Xfce and
GNOME Terminal) get transparent.

    $ lspci -nn -s 65:00.0
    65:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Lexa XT [Radeon PRO WX 3100] [1002:6985]

After one or two seconds the problem fixes itself. Nothing is in the Linux logs
regarding this issue.

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[Bug 108095] Window becomes partially transparent for short time

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https://bugs.freedesktop.org/show_bug.cgi?id=108095

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Please attach the corresponding Xorg log file and the outputs of dmesg and
glxinfo.

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[Bug 108095] Window becomes partially transparent for short time

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https://bugs.freedesktop.org/show_bug.cgi?id=108095

--- Comment #2 from Paul Menzel <pmenzel+bugs.freedesktop@molgen.mpg.de> ---
Created attachment 141778
  --> https://bugs.freedesktop.org/attachment.cgi?id=141778&action=edit
Linux 4.14.55 messages

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[Bug 108095] Window becomes partially transparent for short time

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https://bugs.freedesktop.org/show_bug.cgi?id=108095

--- Comment #3 from Paul Menzel <pmenzel+bugs.freedesktop@molgen.mpg.de> ---
Created attachment 141779
  --> https://bugs.freedesktop.org/attachment.cgi?id=141779&action=edit
/var/log/gdm/:0.log

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[Bug 108095] Window becomes partially transparent for short time

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https://bugs.freedesktop.org/show_bug.cgi?id=108095

--- Comment #4 from Paul Menzel <pmenzel+bugs.freedesktop@molgen.mpg.de> ---
Created attachment 141818
  --> https://bugs.freedesktop.org/attachment.cgi?id=141818&action=edit
Output of `glxinfo`

Please find the output of `glxinfo` attached. Here is an excerpt.

```
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: X.Org (0x1002)
    Device: AMD Radeon Pro WX3100 (POLARIS12, DRM 3.19.0, 4.14.55.mx64.224,
LLVM 6.0.1) (0x6985)
    Version: 18.1.6
    Accelerated: yes
    Video memory: 4096MB
    Unified memory: no
    Preferred profile: core (0x1)
    Max core profile version: 4.5
    Max compat profile version: 3.1
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.1
```

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[Bug 108095] Window becomes partially transparent for short time

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https://bugs.freedesktop.org/show_bug.cgi?id=108095

--- Comment #5 from Michel Dänzer <michel@daenzer.net> ---
Does restarting xfwm4 with any of these arguments make a difference?

 xfwm4 --replace --vblank=off
 xfwm4 --replace --vblank=glx
 xfwm4 --replace --vblank=xpresent

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[Bug 108095] Window becomes partially transparent for short time

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https://bugs.freedesktop.org/show_bug.cgi?id=108095

--- Comment #6 from Paul Menzel <pmenzel+bugs.freedesktop@molgen.mpg.de> ---
(In reply to Michel Dänzer from comment #5)
> Does restarting xfwm4 with any of these arguments make a difference?
> 
>  xfwm4 --replace --vblank=off
>  xfwm4 --replace --vblank=glx
>  xfwm4 --replace --vblank=xpresent

The user wasn’t able to reproduce the problem with `xfwm4 --replace
--vblank=off` yet. Should he also test the other suggestions nevertheless?

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[Bug 108095] Window becomes partially transparent for short time

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https://bugs.freedesktop.org/show_bug.cgi?id=108095

--- Comment #7 from Michel Dänzer <michel@daenzer.net> ---
(In reply to Paul Menzel from comment #6)
> The user wasn’t able to reproduce the problem with `xfwm4 --replace
> --vblank=off` yet. Should he also test the other suggestions nevertheless?

Yes, please. It'll be valuable to know if it happens with both of the other
ones, or only one of them.

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[Bug 108095] Window becomes partially transparent for short time

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https://bugs.freedesktop.org/show_bug.cgi?id=108095

--- Comment #8 from Paul Menzel <pmenzel+bugs.freedesktop.org@molgen.mpg.de> ---
libXpresent was not installed here, so xfwm didn’t have support for it.

```
$ xfwm4 --version
        This is xfwm4 version 4.13.1 (revision 942156e4) for Xfce 4.12
        Released under the terms of the GNU General Public License.
        Compiled against GTK+-3.22.30, using GTK+-3.22.30.

        Build configuration and supported features:
        - Startup notification support:                 Yes
        - XSync support:                                Yes
        - Render support:                               Yes
        - Xrandr support:                               Yes
        - Xpresent support:                             No
        - Embedded compositor:                          Yes
        - Epoxy support:                                Yes
        - KDE systray proxy (deprecated):               No
```

Installing libXpresent and rebuilding xfwm, the report that everything works
now.

As I do not know the dependencies between all components, I cannot say, that
it’s really no driver bug.

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[Bug 108095] Window becomes partially transparent for short time

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https://bugs.freedesktop.org/show_bug.cgi?id=108095

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|DRI git                     |git
            Product|DRI                         |Mesa
          Component|DRM/AMDgpu                  |GLX
         QA Contact|                            |mesa-dev@lists.freedesktop.
                   |                            |org
           Assignee|dri-devel@lists.freedesktop |mesa-dev@lists.freedesktop.
                   |.org                        |org

--- Comment #9 from Michel Dänzer <michel@daenzer.net> ---
I think this is because the glXWaitX implementation in Mesa isn't reliable.
xfwm4 relies on it to synchronize between X11 protocol drawing to a pixmap and
sampling from an OpenGL texture bound to the corresponding GLXPixmap via
GLX_EXT_texture_from_pixmap.

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