Comment # 5
on bug 105534
from Alex Deucher
(In reply to Christian König from comment #3) > What you can use is either an active DP to dual DVI converter (probably > rather expensive if such a thing even exists) or native DP/HDMI (if the > monitor has connectors for that). They are actually relatively common for just these sorts of scenarios. Not sure about cost however. (In reply to philipmorant from comment #4) > Thanks for replies. My monitor is DVI DL only. > > My old Haswell i5 4670 with HD4600 graphics was also single link DVI only > (https://communities.intel.com/thread/44135), and it worked at 60Hz. Could > somebody please explain why haswell can do it but raven can't ? I'm not sure how the intel hw is designed. I can't comment on exactly what is happening. I suspect what is happening is that the intel driver is not validating the link requirements and treating the DVI port like HDMI and sending the high bandwidth mode over a single TMDS link. The monitor just happens to accept it. > > Otherwise I find myself assuming that the hardware is capable of DL DVI, > just that the manufacturers aren't validating for it, ergo fixable in > software. No. DL DVI requires two digital transmitters, one for each TMDS link. We only wire a single transmitter to each physical connector. For DL DVI, you need two transmitters connected to the physical connector. > > I understand if AMD object to coding for something that hasn't been > validated (I'd do the same myself). Would it be possible alternatively to > provide hints in log output or code comments or on a wiki somewhere, such > that people in my position can hack the source themselves ? You could try hacking the driver to treat the monitor as HDMI even through it's DL DVI. Maybe your monitor will accept the timing over a single TMDS link. > > Secondly, even accepting the single link limitation, shouldn't it be > possible to run at 33 refresh rate ? I tried at 30 and got nothing. > It depends on the hardware and the panel in the monitor. The monitor hardware may not like 30 Hz refresh rates. > Thirdly, why does amdgpu refer to the connection as HDMI-A-3 ? There's no > HDMI in the setup at all. The display connectors are read from a table in the bios and are determined by the OEM that designs the board. It our case the OEM seems to have set it up as 3 HDMI connectors and a DP connector. What physical connectors are actually on the board?
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