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Resolved DVI to hdmi issues
- Thread starter MarkC426
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Dell U2715H has HDMI 1.4 single link input.
It does not support DVI-D dual link input.
It does have a DisplayPort 1.2 input.
Therefore, you can use a Dual Link DVI to DisplayPort 1.2 adapter such as this one from Gefen:
https://www.bhphotovideo.com/c/prod...l_Link_DVI_to_Mini_DisplayPort_Converter.html
Without a Dual Link DVI adapter, you should be able to get lower resolutions like 1920x1080 to work.
What does output from https://github.com/joevt/AllRez say?
It does not support DVI-D dual link input.
It does have a DisplayPort 1.2 input.
Therefore, you can use a Dual Link DVI to DisplayPort 1.2 adapter such as this one from Gefen:
https://www.bhphotovideo.com/c/prod...l_Link_DVI_to_Mini_DisplayPort_Converter.html
Without a Dual Link DVI adapter, you should be able to get lower resolutions like 1920x1080 to work.
What does output from https://github.com/joevt/AllRez say?
Would a single link DVI to HDMI work, I don’t need the screen shared G5 to run at full rez.
It only needs to be connected for occasional direct monitor access (i.e. for shutting down, as this cannot be done from screen sharing, so I can just switch monitor inputs).
It only needs to be connected for occasional direct monitor access (i.e. for shutting down, as this cannot be done from screen sharing, so I can just switch monitor inputs).
It should but you tried that already (you said you used a DVI-D to HDMI cable).
Enable screen sharing in Mac OS X 10.5 or use a VNC Server in Mac OS X 10.4 to see what the system thinks about the display. Maybe it's trying to use an unsupported mode. Choose a lower resolution such as 1920x1080.
The cable I have has the full bank of square pins (technical term…. 🥴), which is a dual link (screen grab above post). I have just ordered a single link with the two banks of nine pins….🤞
Which will make 0 difference as a passive adapter to HDMI will always be single link.
Spec for that is 165MHz newer cards (like late HDxxxx/Rx 2x0) will just blast 300MHz through that (since their DVI port is just a HDMI one with a weird connector).
X1900/1950 can push it to about 210MHz, but that would require the SW side not enabling the 2nd link (at which point you will only see every 2nd pixel).
Short story extra long:
Without a DL_DVI monitor or a DL_DVI capable adaptor anything beyond 1920x1200 will fail. Now why the G5 and monitor don't manage to agree on such a res is the issue.
Is the X1900 a genuine Apple part or some reflashed PC part?
It is the Apple G5 edition (bought new……waaaaaay back).
I will have another look at the weekend, it was a while ago I tried my existing cable (I ended up connecting an old 19” dvi monitor direct which worked fine).
Maybe as @joevt suggests, I need to set a lower resolution (it would have been set at 1920x1200, when last used).
It could be the first cable is not bi-directional, so only works from hdmi GPU to dvi monitor.
The one on it’s way is listed as bi-directional.
I don't think it's possible to make a non-bi-directional DVI to HDMI cable unless you wanted to make something way more expensive than it needs to be.
I suppose an optical cable would be non-bi-directional.
Anyway, I would do as instructed by https://forums.macrumors.com/threads/dvi-to-hdmi-issues.2470269/post-34265244
Success….. 😁
The new cable arrived today.
Connected my old 19” dvi to one port, and the dell 27” to the other.
I was then able to select different resolutions from the 19” for the Dell.
1280x720
1280x1024
1600x1200
1920x1080
2048x1132
I then made the Dell the main display and turned off the 19”.
The new cable arrived today.
Connected my old 19” dvi to one port, and the dell 27” to the other.
I was then able to select different resolutions from the 19” for the Dell.
1280x720
1280x1024
1600x1200
1920x1080
2048x1132
I then made the Dell the main display and turned off the 19”.
This sounds like picking the correct resolution via screen sharing would've also worked on the other cable.
Hello! Can you please tell us what cable you have used?
StarTech.com 3m High Speed HDMI Cable to DVI Digital Video Monitor - M/M Computer Monitor Cable (HDDVIMM3M), Black
The HDDVIMM3M 3 m HDMI to DVI-D cable enables you to connect a DVI-D video card (or other DVI-D output device) to a display that incorporates HDMI technology; the cable supports bi-directional operation that also allows the reverse configuration delivering digital video from an HDMI-enabled outpu...
www.amazon.co.uk
In retrospect, as @Project Alice states above I think my original dual-link cable would have worked.
It was a case of having a second ‘old’ monitor to select the resolution on the newer one.
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