dual r9 280x hdmi working but not mini displayport

[macguy54]

i7 6700k
gigabyte r9 280x
gigabyte z170 mx

sytem works okay in hdmi but i can only get 30hz at 4k, when i trying using one of the mini display ports i can see the bios screen but after it get to clover i get a black screen no signal. is there any fix to this?

 

[Fl0r!an]

Is Inject/Ati enabled or disabled? If it's enabled, which FBName did you provide?

 

[macguy54]

Is Inject/Ati enabled or disabled? If it's enabled, which FBName did you provide?

i did not inject anything ,what would i name it as? im assuming i should be doing this in clover configurator

 

[Fl0r!an]

It's usually not necessary, but the correct framebuffer personality for (reference style) 280X's is "Hamachi".

 

[macguy54]

It's usually not necessary, but the correct framebuffer personality for (reference style) 280X's is "Hamachi".

i found this on another site, i just have no idea where to put it


FB patch based on Gigabyte R9 280X 3GB / GV-R928XOC-3GD/F60 (device id - 0x6798)

Personality: Futomaki

00040000040300000001010112040401000400000403000000010201220505020400000014020000000103000000060600080000040200000001040011020103

patch

00020000040200000001000010000406000800000002000000010000110203040004000004030000000100001204010100040000040300000001000022050202

 

[macguy54]

injecting ati and futmaki, disbale hdmi and minidisplay completely, i can only see partial boot up screen then it flickers and shuts of

 

[Fl0r!an]

Futomaki is for HD 7870. As I said, Hamachi is usually the best match for a R9 280X. Might need some minor fixes, but Gigabyte cards are usually very close to reference layout.

 

[macguy54]

your right hamachi works, but im still only getting 4k@30hz if i change my monitor setting to dp1.2 my screen splits into two and still im getting 30hz. ive also noitced if i leave the monitor in dp 1.2 and try restarting the system will reboot after it tries loading el capitan.

 

[Fl0r!an]

Is it an DP 1.2 SST or MST display? The latter can be troublesome in OS X, no sure if it needs some special fixes to work.

 

[macguy54]

Is it an DP 1.2 SST or MST display? The latter can be troublesome in OS X, no sure if it needs some special fixes to work.

yes its a 1.2 mst dell up3214q. going to try some of these system definitions and see what happens,.

This was take from an apple site.


"
Multi-Stream Transport (MST) Displays
These Mac computers support multi-stream transport (MST) displays at 60 Hz:

• MacBook Pro (Retina, 15-inch, Late 2013) and later
• MacBook Pro (Retina, 13-inch, Early 2015) and later
• Mac Pro (Late 2013)
• iMac (Retina 5K, 27-inch, Late 2014) and later

If you use a 60Hz MST display with the MacBook Pro (Retina, 15-inch, Mid 2015) with AMD Radeon R9 M370X graphics card or iMac (Retina 5K, 27-inch, Late 2014), only one additional Thunderbolt display can be supported. Learn more about Thunderbolt ports and displays."