1 Solution
I believe this issue may have been resolved! As posted by fsadough in this post, the 19.Q2 driver released on May 8, is working just as described with 10 bpc enabled at 4K@60Hz in RGB 4:4:4 Pixel Format mode! Fantastic! I am so thrilled! Thanks to fsadough and the development team at AMD for bringing this fix to us!
I noticed only an oddity in the driver settings panel, and they are underlined in red. But it appears to have no functional impact so far, which is great. If I recall correctly, I've seen the same artifact in previous Radeon Pro drivers when the 10-bit Pixel Format advanced setting is enabled, though I thought that it had been fixed (The reason I've enabled the setting is because Photoshop requires it in order to use the 10 bpc functionality).
Now the last step can be completed -- FINALLY to calibrate my monitors using this new driver! Calibration worked on older drivers (I believe 18.Q1), but failed on 19.Q1.1, though I'm not sure why. BenQ's calibration software seems a bit sensitive, especially with dual monitor setups. Here's hoping!
Thanks fsadough!
David
I also learned that the Advanced Settings 10-bit pixel format support is NOT required to enable 10-bit color depth -- something that is not clear from AMD. The dialog box is the old style Catalyst format and looks like this:
It's the checkbox in the middle of the dialog. For a while I assumed this had to be checked for 10-bit depth to work. Apparently not I guess. Too bad there's no manual that makes it clear how to use the settings like this! I asked AMD for one.
Glad you got it working! 
This is useful. I notice at least one difference between our setups (aside from driver version). I have 2 identical BenQ monitors running in extended desktop mode to allow me to use one monitor for viewing the full photograph and the other for the interface for Lightroom or Photoshop. I'm also running both monitors at 4K resolution (3840x2160). How does this compare to your setup? I'm wondering if 17.8.2 will work for me. Of course currently I have 18.20.24 working in 10-bit color mode albeit in the 4:2:2 mode as you see below:
I also noticed that the heading for your settings dialog box says "Radeon Settings" and mine says "Radeon Pro and FirePro Settings". Makes me wonder if they are two different drivers. Seems likely that they are. I don't recall seeing the Vega card in the list of board supported by my driver -- they were all WX?100 boards, like WX5100 (mine), WX7100, WX8100, etc. 
Just wondering what version of the BenQ SW320 monitor driver you are using? Recently I downloaded mine from BenQ’s support page for the monitor. The sw320.cat file was dated 11/9/2017 and Windows Device Manager reports 9/9/2016 and version 1.0.0.0. Driver Details shows the files monitor.sys (a Windows file) and sw320.icm (color management). So I’m not sure what file is the driver from BenQ.
m0reilly wrote:
Could you post your hex dump EDID for the BenQ SW320? I would like to compare it to mine to see if there is anything that stands out to me. It may help me understand where the problem is with enabling 10 bpc. I could also use it to emulate your monitor with my WX5100 to see what it reports.
TIA,
David
Thanks for posting this EDID.
I loaded it into the AMD driver on port 3 as an emulation and the driver reported only 8 bpc capability as seen in the screenshot below.
I don't understand this because this is the same monitor that demonstrated 10 bpc at Full RGB 4:4:4 according to your screenshot post earlier in February. I was expecting it to show 10 bpc at RGB 4:4:4 Pixel Format, 4K@60Hz. I guess I don't understand EDIDs and how they work. But thanks for posting it.
here is a shot from this evening:
I got some odd results from using your EDID in emulation.
Note that in my dual monitor configuration, port 1 and port 2 on the WX 5100 are connected to the two BenQ SW320s. Port 3 and port 4 are not used. So I used port 3 for emulating your BenQ SW320 using the EDID you posted above.
Odd Results (fsadough if you're reading this, your input would be appreciated)
- Starting point: No emulation; both monitors set to 10 bpc, YCbCr 4:2:2 pixel format with monitors at 60Hz.
I loaded the EDID into port 3 from a text file that I created from your post. I changed the default bit rate from 2.7GHz to 5.4GHz. Ports 1 & 2 remained as they were. The emulated monitor on port 3 showed 8 bpc, and it would revert back to 8 bpc when I attempted to change it to 10 bpc. But tried this experiment a second time to capture the screenshots and I got a different result: - Starting point: No emulation; both monitors set to 8 bpc, RGB 4:4:4 pixel format, monitors at 60Hz.
I loaded your monitor EDID into port 3 as before and changed the Bit Rate to 5.4GHz.
All 3 ports switched to 10 bpc and the physical monitor refresh rates were changed to 30Hz. When I removed the emulation, both physical monitors reverted to 60Hz at 8 bpc, RGB 4:4:4. But I've gotten inconsistent results with this set of changes. On another try with the same starting point, when I applied emulation on port 3 the physical monitor settings were not changed, and port 3 used 8 bpc. And upon changing port 3 setting to 10 bpc, it reverted back to 8 bpc. - Starting point: No emulation; both monitors set to 10 bpc, RGB 4:4:4 pixel format, monitors at 30Hz
I load your EDID into port 3, set the bit rate to 5.4GHz. Ports 1, 2 and 3 are using 10 bpc, RGB 4:4:4 @ 30Hz - When I remove an emulated port, the refresh rate for both physical monitors sometimes gets changed automatically by the AMD driver.
- None of my efforts produced an emulated monitor on port 3 that uses 10 bpc, RGB 4:4:4 pixel format at 60Hz refresh
fsadough has said that the WX 5100 uses the EDID to determine the monitor capabilities, and then offer appropriate options in the driver. Since m0reilly's EDID currently enables 10 bpc on his BenQ SW320, but his EDID will not enable 10 bpc in emulation with my WX 5100, I wonder what conclusion can I draw from that. Does it mean my WX 5100 is defective? Or is emulation mode not a good method to determine this? Not sure what to think. But I would really appreciate finding a way to determine where the issue is, whether with the graphics card or with both monitors, because I don't want to ask BenQ to send me two new monitors and still have the same technical problem with the same dilemma for determining which hardware (or software?) is the issue. I need help! TIA
You can also get a text dump of the EDID from the Advanced Settings panel by hovering over the right edge of the Connection 1 line -- then 3 icons will appear and the middle one allows you to save the export to txt.
