I have registered on this forum while researching some serious Dell U2415 anomalies/ malfunctions reported by user ISAA on Macfreak.nl.
By now I am almost convinced his/her issues with 2 (sic) brand new Dell U2415 monitors in a row are caused by the fact that the Mac Mini video card they were connected to is not Displayport 1.2 (a) capable.
My theory now is that the Dell U2415 connected to a video card only capable of Displayport 1.1 will not impart its EDID correctly, thus causing the connected OS ( Windows, MacOSX, Linux) to fall back to a horrible or impossible "generic non-PNP resolution", random flickering, and black screens.
On Windows computers this may be less obvious if the system is used with only a primary monitor. On Mac and Linux systems, at least very often, I suspect, the issue is obvious to those that can recognise "generic non-PNP resolutions".
If you do get an image, you do not often inquire further...
My point is: if you have a Dell U2415 as a primary and only monitor, connected to a video card only capable of Displayport v. 1.1, chances are that EDID will not be properly communicated, especially on MacOSX and Linux.
I think Dell should give fair warning to users and dealers alike that the fist thing to try with monitor issues with the U24XX series is switching of Displayport v.1.2 capabilities.
Thing is: I am in doubt if Dell is even aware of this issue!
The fact you have reported that EDID is battling if both HDMI and Displayport are used simultaneously also seems a grave issue to me.
If you have both HDMI and DP cables connected between 1 computer and 1 monitor, EDIDs should be identical.
Hi, i just solve the dp MST problem for two Dell U2414H monitors, what i do is simply that remove all the "generic non-PNP resolution" devices。 Now, i can connect with type-c (thunderbolt 3 port) to DP--DP--miniDP. And my laptop is Alienware 13 R2.
Anonymous User
1 Rookie
•
8 Posts
0
April 16th, 2016 22:00
Thank you, dankjewel, Matthijs!
I have registered on this forum while researching some serious Dell U2415 anomalies/ malfunctions reported by user ISAA on Macfreak.nl.
By now I am almost convinced his/her issues with 2 (sic) brand new Dell U2415 monitors in a row are caused by the fact that the Mac Mini video card they were connected to is not Displayport 1.2 (a) capable.
My theory now is that the Dell U2415 connected to a video card only capable of Displayport 1.1 will not impart its EDID correctly, thus causing the connected OS ( Windows, MacOSX, Linux) to fall back to a horrible or impossible "generic non-PNP resolution", random flickering, and black screens.
On Windows computers this may be less obvious if the system is used with only a primary monitor. On Mac and Linux systems, at least very often, I suspect, the issue is obvious to those that can recognise "generic non-PNP resolutions".
If you do get an image, you do not often inquire further...
My point is: if you have a Dell U2415 as a primary and only monitor, connected to a video card only capable of Displayport v. 1.1, chances are that EDID will not be properly communicated, especially on MacOSX and Linux.
I think Dell should give fair warning to users and dealers alike that the fist thing to try with monitor issues with the U24XX series is switching of Displayport v.1.2 capabilities.
Thing is: I am in doubt if Dell is even aware of this issue!
The fact you have reported that EDID is battling if both HDMI and Displayport are used simultaneously also seems a grave issue to me.
If you have both HDMI and DP cables connected between 1 computer and 1 monitor, EDIDs should be identical.
Liamz
1 Message
0
February 23rd, 2017 23:00
Hi, i just solve the dp MST problem for two Dell U2414H monitors, what i do is simply that remove all the "generic non-PNP resolution" devices。 Now, i can connect with type-c (thunderbolt 3 port) to DP--DP--miniDP. And my laptop is Alienware 13 R2.
Here is the photo: