Bug 982340 - Windows leave traces on wallpaper
Windows leave traces on wallpaper
Product: Fedora
Classification: Fedora
Component: xorg-x11-drv-intel (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Petr Šabata
Fedora Extras Quality Assurance
Depends On:
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Reported: 2013-07-08 14:15 EDT by ojab
Modified: 2015-02-18 08:59 EST (History)
4 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2015-02-18 08:59:16 EST
Type: Bug
Regression: ---
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Documentation: ---
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
Screenshot (125.24 KB, image/png)
2013-07-08 14:15 EDT, ojab
no flags Details

  None (edit)
Description ojab 2013-07-08 14:15:16 EDT
Created attachment 770606 [details]

Description of problem:
Most likely dwm isn't correct pkg, but I don't know what to choose.
In F19 windows leaves traces on wallpaper (see the attaches screenshot) and not only for me (googled http://imgur.com/r/Fedora/SfPneUT for example).
There is no traces on background after `xsetroot -solid black`.

Version-Release number of selected component (if applicable):
Name        : dwm
Arch        : x86_64
Version     : 6.0
Release     : 5.fc19

How reproducible:

Steps to Reproduce:
1. yum install dwm
2. Login to dwm session 
3. Open window
4. Move window

Actual results:
Distorted wallpaper

Expected results:

Additional info:
No traces on wallpaper.
Comment 1 Petr Šabata 2013-07-09 03:34:43 EDT
Weird.  Is this new behaviour compared to f18?
Could you also state what video driver you use and how you set your wallpaper?
Comment 2 Petr Šabata 2013-07-09 04:05:06 EDT
Note: I can't reproduce this with dwm-6.0-5.fc19.x86_64 on Intel (xorg-x11-drv-intel-2.21.8-1.fc19.x86_64).
Comment 3 ojab 2013-07-09 06:31:39 EDT
Aha, reproducible only with SNA enabled, no issues using UXA.
Sorry that I haven't mentioned that I'm using SNA at first, thought that SNA has been default for a while.

I don't know if SNA is supported in F19, feel free to close the bug as WONTFIX.
Comment 4 Chris Wilson 2013-07-10 15:21:03 EDT
The bug is also present with UXA, and has existed for a few years - so I presume a more recent change in dwm configuration was enough to uncover the issue.

The cause is the fbcon preservation hack leaves the root->backgroundState as None (see InitRootWindow()). dwm (and uncomposited metactiy for that matter) do not set a background by default, and so the expose events, caused by window motion and unmapping, upon the root window as handled by miPaintWindow() are no-ops. Once a background has been set, either a solid color or a Pixmap, everything behaves as expected.

I believe the only reasonable way to workaround this is for gdm to set its final presentation buffer as the background pixmap on the root window (XChangeWindowAttrbiutes).
Comment 5 Petr Šabata 2013-07-31 03:24:24 EDT
Our system dwm build hasn't changed in a while so if there were any changes, it must have been caused by ojab's patches.

(In reply to Chris Wilson from comment #4)
> Once a background has been set, either a solid
> color or a Pixmap, everything behaves as expected.

Does it matter what tool sets it?  ojab obviously uses a wallpaper; something had to set it somehow.
Comment 6 Chris Wilson 2013-07-31 03:52:28 EDT
It doesn't matter, who sets the background property on the root window - it is a global property and persists beyond the lifetime of the client who sets it.
Comment 7 Fedora End Of Life 2015-01-09 17:11:26 EST
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Comment 8 Fedora End Of Life 2015-02-18 08:59:16 EST
Fedora 19 changed to end-of-life (EOL) status on 2015-01-06. Fedora 19 is
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