Mac Pro Late 2013 and Samsung 4k monitor problem

I heard disabling vsync @ 30hz can help, mind trying? http://www.tonymacx86.com/customization/92201-beamsyncdropper-tool-disable-beams ync-permanently.html

Yeah, read one more thing that explained that just after I posted the reply. Still need to test with video etc, but I've just come off the crappiest little monitor you've ever seen that I was using as a stand in, so I'll let it sink in first before I make full judgement. I use a wacom tablet, so mouse lag isn't really something I'm concered about but with the magic mouse, yeah I guess so.

I thought the new Mac Pro was going to be the chosen one... it is in fact... Darth Vader.

thehesiod wrote:

I heard disabling vsync @ 30hz can help, mind trying? http://www.tonymacx86.com/customization/92201-beamsyncdropper-tool-disable-beams ync-permanently.html

Not at the office with the Mac Pro at the moment, but I'll give it a go tomorrow and report back.

Hey guys, appreciate all the info on here but you're all way more advanced than I. I have a 2012 macbook pro and was looking to get a monitor anywhere from 27-40' range. The samsung 4k caught my eye, but i'm assuming my machine might be too old even with any new software updates that come out. any recommendations on what might be a great alternative? thanks in advance.

Has anyone tried running under 10.9.4 to see if its imporved?

both 10.9.4 and 10.10 are not improved.

Also just found out that you sometimes have to unplug the power cable to get the screen working after booting up... under the desk I go... that's a pile of c-rap! Anyone else get that?

Try sleep-and wake your Mac instead.

Will do, shame to have to find work-arounds... I shut down my computer at night normally anyway. I'll see if the same problem comes up in sleep... I have disabled eco power, off timer and 'power led' is set to stand by.

Hi thanks for your posts

"2560x1440 looks fine"

how do you get a clean image on your samsung with display port and 2560x1440

i get the same multi image problem, as in 4k

thanks

Check the EDID of the monitor to make sure it supports a 2560x1440 timing mode, then use SwitchResX to create that timing mode (you'll have to figure out if the mode is GTF or CVT or CVT-RB). This should override the scaled mode that is automatically created by the Mac graphics driver.

I do this on my Apple 30" Cinema HD Display to enable the non-scaled 1280 x 800 mode that it supports (native resolution is 2560 x 1600).

Could you elaborate on how one Checks and/or compensates for the EDID? Or provide a link to an article on the subject for Macs?

Most readers have never had to look at any of this stuff. it used to "just work".

SwitchResX has an option to save the EDID of the display to a text file. The text file will list the limits of the monitor, and the standard resolutions it supports. Then use SwitchResX to add the timings that you want and restart your Mac. SwitchResX will tell you if the new timing was accepted.

I think 2560 x 1440 should look like this:

say, that is pretty cool.

SwitchRes is an old friend of Mac Users.

Do you know if it also fix the RGB problem some users are having with certain Dell 4K displays EDID-ing as TV sets, and getting wrong colors etc (they have needed a Ruby Script to force RGB mode).?

I haven't heard about that problem with the RGB mode.

SwitchResX is only useful for creating/enabling/disabling timings and scaled modes and for viewing the EDID plus some other features (menus, applications, etc). The problem might be fixable by editing the EDID. There may be many color parameters in the EDID that can be changed or added (I don't know which). Maybe this is what the Ruby script is doing? Where is the Ruby script? It would help to know what the fix does...

To create a custom timing or scaled resolution, SwitchResX edits or creates an override file in the /System/Library/Displays/Overrides folder. The override file can also override the EDID of the display. In fact, Apple includes files for some 4K displays that override their EDID. In 10.9.3, the following override files were added or modified:

DisplayVendorID-4d10/DisplayProductID-21dd // PN-K321

DisplayVendorID-4dd9/DisplayProductID-2503 // SONY TV *07

DisplayVendorID-469/DisplayProductID-32a3 // ASUS PQ321

DisplayVendorID-10ac/DisplayProductID-4093 // DELL UP3214Q

DisplayVendorID-10ac/DisplayProductID-409c // DELL UP2414Q

I don't know if SwitchResX shows the EDID of the override file or the original from the monitor. You may want to try removing the override file temporarily to see the original EDID (probably needs a restart for each change). Or maybe the original EDID is stored in the IORegistry? Here's a command to look for EDIDs in the IORegistry:

ioreg -w 0 -l | grep EDID

If all the EDIDs are not the same then you have more than one kind of display, or else one EDID might be the original and the other might be an override.

You need an EDID editor to edit the EDID binary. I think there are EDID editors for Windows that could work or you could edit it directly if you know the format. Then you can use the Property List Editor to paste it into the override file (the "xxd -p" command can be used to convert a binary file into text representation of the hex, and "xxd -p -r" can go from text hex to binary).