[Bug 99908] [i915] driver crashes with dual 4k monitors on Intel HD 520

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99908

--- Comment #10 from Phil Hord <phil at phord.com> ---
The problem worsened in Ubuntu 17.04 so much that I reverted to 16.10.  My
previous attempts to build drm-tip as requested were so far unsuccessful.

I did attempt to build the drm-tip version of the driver against last month,
but did not succeed.  For safety I tried to build in a clean Ubuntu
installation.  The build ran for a long time before I had to give up and get
back to my real work.

I later tried to finish the build in a VM so I could carry on working in
parallel but ran into too many problems there.

I have been an embedded Linux developer for 9+ years with a bit of experience
in kernel drivers and build systems. I don't usually have to deal with video
displays so many of these external packages (mesa, glx, X, etc.) are foreign to
me. But I find the instructions at
https://01.org/linuxgraphics/documentation/build-guide-0 to be frustratingly
vague in some places and broken in others. I kept a log of errors for a while
hoping I could submit a patch to someone, but ultimately I could not
confidently identify the someone to report it to.  

I managed to muddle through most of the build steps, but it's not clear to me
if all of them are needed or some subset, nor how to proceed with testing
afterward, should I ever reach the end.  

Do I really need to build a replacement kernel, i915 driver, mesa driver, X
server, libdrm middleware, and so on -- the complete stack -- to properly test?
 I suppose so, but this just makes the task that much more daunting. With just
a simple request to "try building from drm-tip" I am left with too many
questions.

On two different attempts to build this system following this guide, I got so
mired in the mud that I gave up.  The .config differences were significant
enough in drm-tip to make me tune out and take all the defaults.  Does it
matter?  I may never know.

In the meantime, I did try a newer release with Ubuntu 17.04 last month.  The
problems there had worsened such that I was unable to start at all with two
monitors connected, even at 30Hz.  I went back to trying to build drm-tip so I
could get useful info for this bug report, but again the build took hours and
lots of babysitting.

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