I’ve been having a couple issues with Compiz:
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the window buttons lose their animations (they remain static even when hovered over or clicked on) on nearly all windows; for some reason, applications like Firefox and Abiword don’t have the issue, but all other windows do
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window focus is inconsistent. Sometimes clicking on a window raises it to the front, but the titlebar remains greyed out; other times, several windows will display active titlebars despite only one window actually being active
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every now and then, programs (like Firefox) stop wanting to draw things to the screen until I minimize and re-open them; e.g. opening a new tab with Ctrl+T shows “new tab” in the titlebar, but nothing changes in the window
I have a hunch that these are partly caused by my using a proprietary AMD driver, but I have a Radeon HD 6850 card that doesn’t work with the open-source driver. I tried switching to it, and I got dropped to a runlevel 3 console when I tried to boot.