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Ubuntu 15.10 Intel-NUC video doesn't recover when input is switched

idata
Employee
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I purchased an Intel-NUC to hide behind a display (Dell U3014) that I typically use with a MacBook Pro (Runs Linux mostly, but dual boots Windows 7 Windows 10). The NUC is using a Mini-DP to DP connector and the MBP is using a DP to Mini-DP. (DisplayPort 1.2 support on the monitor is annoyingly turned off. I would love it if MST worked with Intel graphics ON LINUX, but that is another issue.)

For the record I have the same issue with Ubuntu 15.04 or 14...

Intel NUC Kit NUC5i7RYH

(has dedicated Samsung 850 (M.2) for Kubuntu and dedicated Samsung 840 (SATA) for Windows)

uname -a

Linux erniee-nuc 4.2.0-16-generic # 19-Ubuntu SMP Thu Oct 8 15:35:06 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

 

lspci -s 02 -k

 

00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09)

 

Subsystem: Intel Corporation Device 2057

 

Kernel driver in use: i915

 

When I turn the display off, switch inputs, or otherwise lose the signal to the display the Linux driver/TTY7 will NOT recover. This is beyond annoying if I have left things in a state that I need to work with. Yeah, I also could run Linux in a VM on the MBP (and do) but that isn't the point. I can Ctrl+Alt+F1 (1-6) to use any of the other FB tty's, but haven't found a way to recover the display.

 

Is there a solution to this? I really don't know who to 'blame', but I DO NOT have the same issue (on other systems, will ask related, but different questions about those) with the Intel drivers disabled and NVidia hosted displays under Ubuntu/Linux (sometimes Debian in the past).

 

If I leave the system connected to the display at all times, then I don't have issues.

 

 

 

 

 

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Allan_J_Intel1
Employee
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Intel does not test and validate Intel® NUC on Linux; however, we know that a lot of NUC owners are using it successfully on many different Linux distros.

Intel suggests you check your Linux distro's website and forums at http://ubuntuforums.org/ Ubuntu Forums for peer assistance with this issue.

Allan.

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sb12
Beginner
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I'm also experiencing a lot of trouble with that grafic card... until now I was always buying Intel Hardware, because of its good compatibility with linux, but I will have to reconsider this...

 

I tried that hardware on fedora, ubuntu and a few other, with kernel 3.x , 4.2, 4.3, 4.4, and I have always troubles with multiple displays and recover from standby.
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Allan_J_Intel1
Employee
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This page might have just the information or drivers you are looking for: https://01.org/linuxgraphics Intel® Graphics for Linux* | 01.org

Allan.

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