I found https://wiki.ubuntu.com/X/Troubleshooting/HighCPU
$ glxinfo |grep render
direct rendering: Yes
OpenGL renderer string: Mesa DRI Intel(R) Sandybridge Mobile
GL_NV_conditional_render, GL_AMD_draw_buffers_blend,
killing applications one-by-one is not really an option since I cannot
rep
I wish there were a less disruptive workaround than `killall Xorg`
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https://bugs.launchpad.net/bugs/1182156
Title:
Xorg is pegged constantly redrawing the panel
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