Bug 1021455 - Font corruption in Xrender apps
Font corruption in Xrender apps
Product: Fedora
Classification: Fedora
Component: libXrender (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Benjamin Tissoires
Fedora Extras Quality Assurance
Depends On:
  Show dependency treegraph
Reported: 2013-10-21 06:40 EDT by Ian Collier
Modified: 2015-02-17 12:46 EST (History)
1 user (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2015-02-17 12:46:16 EST
Type: Bug
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Attachments (Terms of Use)
Firefox screenshot (477.96 KB, image/png)
2013-10-21 06:40 EDT, Ian Collier
no flags Details
gedit screenshot (20.26 KB, image/png)
2013-10-21 06:41 EDT, Ian Collier
no flags Details

  None (edit)
Description Ian Collier 2013-10-21 06:40:44 EDT
Created attachment 814525 [details]
Firefox screenshot

Applications that use Xrender appear to substitute random characters of different fonts for characters that should be displayed.  This affects at least Firefox, Thunderbird, gedit and fontforge.  The attached screenshots in which the problem should be obvious were obtained with:

rm -rf /tmp/ff
mkdir /tmp/ff
HOME=/tmp/ff /usr/bin/firefox &

echo abcdefghijklmnopqrstuvwxyz > alpha.txt
gedit alpha.txt &

I am unsure how to debug this further; however, Firefox has a pref called gfx.xrender.enabled which when toggled to false completely fixes this problem.  I don't know if there is a similar fix for gedit.

The hardware is an Intel Core i5 CPU with "Ivybridge Desktop (GT1)" graphics using xorg-x11-drv-intel-2.21.12-2.  It may be relevant that the AccelMethod for the Intel X11 driver is set to SNA because the default of UXA does not support Zaphod mode, which I use.  So it's possible this is an Intel bug rather than an Xrender bug.
Comment 1 Ian Collier 2013-10-21 06:41:35 EDT
Created attachment 814528 [details]
gedit screenshot
Comment 3 Fedora End Of Life 2015-01-09 15:19:42 EST
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Comment 4 Fedora End Of Life 2015-02-17 12:46:16 EST
Fedora 19 changed to end-of-life (EOL) status on 2015-01-06. Fedora 19 is
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