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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.
Created attachment 814528 [details] gedit screenshot
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