559068 – energy saving mode does not work when using DisplayPort-cable

Bug 559068 - energy saving mode does not work when using DisplayPort-cable

Summary: energy saving mode does not work when using DisplayPort-cable

Status:	RESOLVED DUPLICATE of bug 560774

Alias:	None

Product:	Gentoo Linux
Classification:	Unclassified
Component:	[OLD] Unspecified (show other bugs)
Hardware:	AMD64 Linux

Importance:	Normal normal (vote)
Assignee:	Gentoo Linux bug wranglers

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Depends on:
Blocks:

Reported:	2015-08-29 08:46 UTC by Mario Bachmann
Modified:	2015-09-26 20:54 UTC (History)
CC List:	1 user (show)

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Runtime testing required:	---

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Description Mario Bachmann 2015-08-29 08:46:41 UTC

I iiyama_ProLite_XB2776QShave absolutely no idea for that behaviour. 

I have to following combination:
iiyama ProLite XB2776QS
MSI GeForce GTX 980 Gaming 4G (GM204)
nvidia driver 355.06

When I use DVI-cable, that the display goes into energy saving mode after a while.

When I use a DisplayPort-cable, the display is always in on-mode. When triggering suspend mode with "xset dpms force suspend", the display shows a black screen. 

I check the mode of the display with its power indicator (LED): blue means on, orange means power saving mode. 



Reproducible: Always

Steps to Reproduce:
1. use a DisplayPort cable instead of DVI
2. try getting display into power saving mode


Expected Results:  
Energy Saving modes (suspand, standby, ...) should work with all kind of digital cable connection. 

Modern graphic cards tend to offer more and more DisplayPorts (or Mini) only. I a multi monitor setup I could use my working DVI, but for the second display I have to use DisplayPort. HDMI ist no real Option, because combination of resolution and refresh rate seems to be limited to FullHD/60Hz.

Comment 1 Alex Xu (Hello71) 2015-09-20 16:05:39 UTC

guessing source to be nvidia-drivers.

Comment 2 Alex Xu (Hello71) 2015-09-20 19:08:21 UTC

jer: what info exactly is required?

Comment 3 Mario Bachmann 2015-09-20 19:32:25 UTC

What does the status "RESOLVED NEEDINFO" mean? Sounds like a joke. 

Do you even own a nvidia graphics card? Did You try the the described steps to reproduce the bug? 

This was my last bug report. Greetings.

Comment 4 Alex Xu (Hello71) 2015-09-26 20:54:17 UTC


*** This bug has been marked as a duplicate of bug 560774 ***