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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1460674

Title:
  [i915_bpo] Rebase driver to 4.2~pre

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Vivid:
  In Progress

Bug description:
  Upstream i915 code has been feature-frozen for drm-next, and rebasing
  i915_bpo to it is fairly simple. We need all the drm_atomic* changes
  to date though, in order to avoid oopses loading the driver.
  Thankfully i915_bpo is the only driver that uses them (besides msm),
  so there's no chance of regressing other drivers that we care about.

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