This is a bug in the intel dri driver and occurred for me while using flightgear, but looks like can happen in libreoffice as well.
https://bugs.freedesktop.org/show_bug.cgi?format=multiple&id=70441 Building mesa 10.2.7 from source and installing fixes the issue : intel core gpu (ironlake), ubuntu 14.04 64 bit wget ftp://ftp.freedesktop.org/pub/mesa/10.2.7/MesaLib-10.2.7.tar.bz2 tar jxvf MesaLib<tab> cd MesaLib<tab> sudo apt-get install build-essential sudo apt-get build-dep mesa ./configure --prefix=/usr --enable-gles1 --enable-gles2 --enable-xa --enable-opencl-icd --with-dri-drivers=i915,i965 --enable-glx-tls --with-dri-driverdir=/usr/lib/x86_64-linux-gnu/dri --with-egl-platforms='drm x11' --with-gallium-drivers="" make -j sudo make install ** Bug watch added: freedesktop.org Bugzilla #70441 https://bugs.freedesktop.org/show_bug.cgi?id=70441 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1313952 Title: octave-cli: ../../../../../../../src/mesa/drivers/dri/i965/brw_eu_emit.c:267: validate_reg: Assertion `execsize >= width' failed. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/octave/+bug/1313952/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
