On 201501-16341 Dell Vostro 3458, an I+N hybrid graphic system The display will blink / distort after starting the graphics_stress_test, system will become unusable due to this display issue. Error message that related to i915 could be found in the dmesg output: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
Preliminary debugging shows this might be caused by the very first VT switching test, this could be easily reproduced simply by using "sudo chvt 1" command. ubuntu@201501-16341:~$ uname -a Linux 201501-16341 3.19.0-20-generic #20+bpo1-Ubuntu SMP Mon Jun 1 20:13:08 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux Tested without the nVidia proprietary driver, running on the Intel GPU OpenGL vendor string: Intel Open Source Technology Center OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 5500 (Broadwell GT2) OpenGL version string: 3.0 Mesa 10.5.2 Not software rendered: yes Not blacklisted: yes GLX fbconfig: yes GLX texture from pixmap: yes GL npot or rect textures: yes Compiz supported: yes I remember that there are some Call trace error as well, I will run the stress test again and give update here. ** Attachment added: "dmesg.log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1460674/+attachment/4413675/+files/dmesg.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1460674 Title: [i915_bpo] Rebase driver to 4.2~pre To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1460674/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
