Created attachment 117425 [details]
dmesg dump

dmesg with drm.debug=0x06

Created attachment 117426 [details]
Xorg.0.log

When playing video, the video will run a couple of seconds, then randomly turn completely black and stay that way until I move the video player's window. When moving the window the image will alternate rapidly between black and correct. If I stop moving the window when the video is showing, it will remain stable for a couple of seconds and then turn black again.

The video will also turn black consistently when I focus another window.

This is on Linux Mint 17.2 (based on ubuntu trusty).
with kernel: 3.19.0-25-generic #26~14.04.1-Ubuntu
running the xorg-edgers ppa with
xserver-xorg-video-intel 2.99.917.git20150723.a29e765e

What command do you to play the video? Do you recall if there was a time when everything worked?

I'm using vlc. I'll have to check whether other players show the same problem. I don't have the video problem with the stock trusty driver(2.99.910 ) but  that version has other probmsle

To be clear, trusty -intel-2.99.910 + current kernel is ok?

Sorry. I have to correct: video works nicely with totem both with 2.99.910 and 2.99.917.git The described behaviour only occurs with vlc both with 2.99.910 and 2.99.917 git. So I don't know whether vlc worked with any driver version.

Hrm. Still, there is something wonky going on. Some jpg files also display completely black with eye of gnome (eog). While they load normally in firefox or other image viewers (mirage).

Can you try running xtrace (http://xtrace.alioth.debian.org/ maybe packaged as x11trace) on vlc and eog so that I can see what method they are trying to use to display?

Created attachment 117447 [details]
eog xtrace dump

Created attachment 117448 [details]
vlc xtrace dump

Hmm, eog looks like it should be ok. I'll track down a 855gm and see if I can get set up. Can you point me at a failing image?

Created attachment 117449 [details]
failing image

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This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/xorg/driver/xf86-video-intel/issues/63.