“*ERROR* pipe is still busy with an old pageflip”

I’ve been hitting an occasional display freeze that matches this description <http://forums.gentoo.org/viewtopic-p-7675146.html>. Looks like a known problem with the 3.16 kernel. I thought things had got better with a system update I did 11 days ago, but this afternoon the freeze recurred. Unlike the previous times, killing all my user processes succeeded in unfreezing the display, so I was able to log in again without rebooting.

Back in January, I wrote:
I’ve been hitting an occasional display freeze that matches this description <http://forums.gentoo.org/viewtopic-p-7675146.html>. Looks like a known problem with the 3.16 kernel. I thought things had got better with a system update I did 11 days ago, but this afternoon the freeze recurred.
Now that Debian Stable 8.0 has been released, Debian Unstable can go back to adding new kernels again. After today’s dist-upgrade, I am now running a 4.0 kernel, so we’ll see if that helps.
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Lawrence D'Oliveiro