Bug 92972

Please add drm.debug=14 module parameter and attach dmesg all the way from boot to the problem.

Please try v4.3 or later kernel.

It's likely this has to do with DP->VGA dongles, based on the reports.

Elio,
Could you have a try and provide the log.

I'm trying to reproduce the issue stressing the system, no positive results so far, i will try to stress the system a few hours and see what happen.

I'm not able to reproduce the problem so far, my configuration:

Ubuntu 15.10 with 3.10.26 Kernel

Stressing the system with stress for more than 8 hours:

"stress -c 10 -m1 --vm 2 --vm-bytes 8192M"

All cpus are over 100% 
Memory (7.7 GiB) 100%  Swap(7.9 GiB) 50%

Using a Dell Monitor thourgh VGA with a Mini Display - Vga Dongle.

Brand:  Startech.

I'm just wondering if we can get the dongle brand since it seems to be difference on the setup

I have a NUC5i7, not an i3, and do not suffer from the problem. My hardware does identify itself as i915. Let me know if I can be any use in testing.

I am having the same problem. Here's some info on my configuration.
Let me know if you need more info. The 2nd monitor connected via hdmi is the one that blacks out, not the laptop screen itself.
No, it's not a problem with my hdmi cable or monitor, those both work on with another computer.

uname -a
Linux ravimannan-P34V4 3.19.0-32-generic #37~14.04.1-Ubuntu SMP Thu Oct 22 09:41:40 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
ravimannan@ravimannan-P34V4 /data $ 


ravimannan@ravimannan-P34V4 /data $ sudo inxi -AG -b
System:    Host: ravimannan-P34V4 Kernel: 3.19.0-32-generic x86_64 (64 bit) Desktop: Cinnamon 2.8.6
           Distro: Linux Mint 17.3 Rosa
Machine:   Mobo: GIGABYTE model: P34V4 Bios: American Megatrends v: FB04 date: 07/22/2015
CPU:       Quad core Intel Core i7-5700HQ (-HT-MCP-) speed/max: 2700/3500 MHz
Graphics:  Card: Intel Broadwell-U Integrated Graphics
           Display Server: X.org 1.17.1 drivers: intel (unloaded: fbdev,vesa)
           tty size: 122x61 Advanced Data: N/A for root
Audio:     Card-1 Intel Broadwell-U Audio Controller driver: snd_hda_intel Sound: ALSA v: k3.19.0-32-generic
           Card-2 Intel Device 8ca0 driver: snd_hda_intel
Network:   Card-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller driver: r8169
           Card-2: Intel Wireless 7260 driver: iwlwifi
Drives:    HDD Total Size: 1128.2GB (0.7% used)
Info:      Processes: 234 Uptime: 4:27 Memory: 1777.3/7895.9MB Client: Shell (sudo) inxi: 2.2.28 


ravimannan@ravimannan-P34V4 /data $ xrandr
Screen 0: minimum 8 x 8, current 5360 x 1440, maximum 32767 x 32767
eDP1 connected 1920x1080+0+16 (normal left inverted right x axis y axis) 309mm x 175mm
   1920x1080      60.0*+   59.9  
   1680x1050      60.0     59.9  
   1600x1024      60.2  
   1400x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x960       60.0  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected primary 3440x1440+1920+0 (normal left inverted right x axis y axis) 800mm x 335mm
   3440x1440      50.0*+   30.0  
   2560x1080      60.0  
   1920x1080      60.0     60.0     59.9  
   1680x1050      59.9  
   1600x900       60.0  
   1280x1024      60.0  
   1280x800       59.9  
   1152x864       60.0  
   1280x720       60.0     59.9  
   1024x768       60.0  
   800x600        60.3  
   720x480        60.0     59.9  
   640x480        60.0     59.9  
HDMI2 disconnected (normal left inverted right x axis y axis)
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

I have a dual boots system. I've been using Windows 10 and I am not seeing this problem. It is not the cable , hdmi port or monitor.

It doesn't seem to be happening at a lower resolution of    2560x1080:

HDMI1 connected 2560x1080+1920+0 800mm x 335mm
   3440x1440      50.0 +   30.0  
   2560x1080      60.0*

Created attachment 124638 [details]
dmesg on a NUC DN2820FYK with drm.debug=14

Seeing the same issue with a 4.6+ kernel, NUC DN2820FYK. I'm using a HDMI/DVI dongle.

Please try drm-intel-nightly branch of [1] and report back.

[1] http://cgit.freedesktop.org/drm-intel

Created attachment 124641 [details]
dmesg running drm-intel-nightly

HEAD: 9d436e8b52d869ff27f49185e865f8e7d36fa4d7

(In reply to Aristeu Rozanski from comment #12)
> Created attachment 124641 [details]
> dmesg running drm-intel-nightly
> 
> HEAD: 9d436e8b52d869ff27f49185e865f8e7d36fa4d7

So is that working or not?

No, same behavior.

(In reply to Aristeu Rozanski from comment #14)
> No, same behavior.

Hello Aristeu,

I was trying to replicate the issue in my nuc here, but i wanst possible, could you share all the hardware configuration that you are using? I'm loosing something important.

Currently i was able to setup this platform with 3 monitors, 1 of them 4k. 

It should be great if you can post all your hardware in order to dismiss cables/monitors. etc.

I just forgot to say that i was trying to reproduce the issue with Kernel 4.8.0