Bug 108095 - Window becomes partially transparent for short time
Summary: Window becomes partially transparent for short time
Status: RESOLVED MOVED
Alias: None
Product: Mesa
Classification: Unclassified
Component: GLX (show other bugs)
Version: git
Hardware: Other All
: medium normal
Assignee: mesa-dev
QA Contact: mesa-dev
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2018-09-28 12:50 UTC by Paul Menzel
Modified: 2019-09-18 17:46 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:


Attachments
(manually edited) screenshot showing the problem (301.38 KB, image/png)
2018-09-28 12:50 UTC, Paul Menzel
Details
Linux 4.14.55 messages (72.11 KB, text/plain)
2018-09-28 14:42 UTC, Paul Menzel
Details
/var/log/gdm/:0.log (51.04 KB, text/plain)
2018-09-28 14:43 UTC, Paul Menzel
Details
Output of `glxinfo` (146.69 KB, text/plain)
2018-10-01 09:16 UTC, Paul Menzel
Details

Description Paul Menzel 2018-09-28 12:50:23 UTC
Created attachment 141774 [details]
(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.
Comment 1 Michel Dänzer 2018-09-28 14:18:43 UTC
Please attach the corresponding Xorg log file and the outputs of dmesg and glxinfo.
Comment 2 Paul Menzel 2018-09-28 14:42:57 UTC
Created attachment 141778 [details]
Linux 4.14.55 messages
Comment 3 Paul Menzel 2018-09-28 14:43:53 UTC
Created attachment 141779 [details]
/var/log/gdm/:0.log
Comment 4 Paul Menzel 2018-10-01 09:16:49 UTC
Created attachment 141818 [details]
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
```
Comment 5 Michel Dänzer 2018-10-01 09:24:17 UTC
Does restarting xfwm4 with any of these arguments make a difference?

 xfwm4 --replace --vblank=off
 xfwm4 --replace --vblank=glx
 xfwm4 --replace --vblank=xpresent
Comment 6 Paul Menzel 2018-10-01 14:21:33 UTC
(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?
Comment 7 Michel Dänzer 2018-10-01 14:25:37 UTC
(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.
Comment 8 Paul Menzel 2018-10-05 11:40:33 UTC
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.
Comment 9 Michel Dänzer 2018-10-05 16:12:05 UTC
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.
Comment 10 Michel Dänzer 2018-10-05 16:13:53 UTC
Specifically, with xfwm4, loader_dri3_wait_x() is currently a no-op, because draw->have_fake_front is false.
Comment 11 GitLab Migration User 2019-09-18 17:46:00 UTC
-- 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/mesa/mesa/issues/114.


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