Well I still can't find the source code to the ubuntu mesa package, but
after having built the older debian version from their git tree, it
didn't fix the problem. I finally decided to power off and cold boot
the system ( instead of just reboot ) and magically the problem went
away. It's still gone after re-upgrading to the current ubuntu version
from the archive so I guess it was just some weird bad state that got
into the gpu and was retained across a warm boot.
** Changed in: mesa (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1378608
Title:
severe performance regression in minecraft
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https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/1378608/+subscriptions
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