Viewing topic How to enable full RGB color range (HDMI) with RX 5700 XT

How to enable full RGB color range (HDMI) with RX 5700 XT

Nonjuffo Dec 15, 2019

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I recently got a RX5700 XT and did a fresh install of Manjaro KDE edition (Kernel 5.4.2, Mesa 19.2.7). For some reason it outputs limited color range RGB to my secondary monitor (TV) through HDMI. I didn't have this problem with GTX 970. My main monitor is also fine. Here's a dump from xrandr:

HDMI-A-0 connected 3840x2160+1920+0 (0x78) normal (normal left inverted right x axis y axis) 1218mm x 685mm

        Identifier: 0x58

        Timestamp:  1574132

        Subpixel:   unknown

        Gamma:      1.0:1.0:1.0

        Brightness: 1.0

        Clones:    

        CRTC:       1

        CRTCs:      0 1 2 3 4 5

        Transform:  1.000000 0.000000 0.000000

                    0.000000 1.000000 0.000000

                    0.000000 0.000000 1.000000

                   filter: 

        EDID: 

                00ffffffffffff004dd903f901010101

                011b0103807a44780a0dc9a057479827

                12484c2108008180a9c0714fb3000101

                01010101010108e80030f2705a80b058

                8a00c2ad4200001e023a801871382d40

                582c4500c2ad4200001e000000fc0053

                4f4e5920545620202a30300a000000fd

                00173e0e883c000a2020202020200168

                020359f05b61605d5e5f621f10140513

                0420223c3e1216030711150206016566

                2c0d7f071507503d07bc570400830f00

                006e030c002000b83c2f008001020304

                67d85dc401788001e200cbe305ff01e5

                0f03000006e3060d01011d007251d01e

                206e285500c2ad4200001e0000000000

                000000000000000000000000000000e5

        GAMMA_LUT_SIZE: 4096 

                range: (0, -1)

        DEGAMMA_LUT_SIZE: 4096 

                range: (0, -1)

        GAMMA_LUT: 0 

                range: (0, 65535)

        CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 

                0 1 

        DEGAMMA_LUT: 0 

                range: (0, 65535)

        TearFree: auto 

                supported: off, on, auto

        vrr_capable: 0 

                range: (0, 1)

        max bpc: 8 

                range: (8, 16)

        underscan vborder: 0 

                range: (0, 128)

        underscan hborder: 0 

                range: (0, 128)

        underscan: off 

                supported: off, on, auto

        scaling mode: None 

                supported: None, Full, Center, Full aspect

        link-status: Good 

                supported: Good, Bad

        CONNECTOR_ID: 87 

                supported: 87

        non-desktop: 0 

                range: (0, 1)

  3840x2160 (0x78) 594.000MHz +HSync +VSync *current +preferred

        h: width  3840 start 4016 end 4104 total 4400 skew    0 clock 135.00KHz

        v: height 2160 start 2168 end 2178 total 2250           clock  60.00Hz

-snip-

I don't see any parameters that I could change like output_csc that was mentioned somewhere. Is there something I could do to enable RGB full range? Is there a GUI for this stuff in KDE (probably not)?

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tuubi Dec 15, 2019

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Quoting: NonjuffoI recently got a RX5700 XT and did a fresh install of Manjaro KDE edition (Kernel 5.4.2, Mesa 19.2.7). For some reason it outputs limited color range RGB to my secondary monitor (TV) through HDMI.

You mean you want 10 bits per colour? You could try updating to the latest stable Mesa to see if it's a driver issue. And even if it isn't. 19.3. came with a lot of fixes for Navi 10.

I'd test, but none of my screens support anything above 8bpc.

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Nonjuffo Dec 15, 2019

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Quoting: tuubiYou mean you want 10 bits per colour? You could try updating to the latest stable Mesa to see if it's a driver issue. And even if it isn't. 19.3. came with a lot of fixes for Navi 10.

I'd test, but none of my screens support anything above 8bpc.

No. I want the full 8 bits (0...255), not the limited range of 16...235.

I can wait until Manjaro updates its repo with Mesa 19.3 and see if it helps. Should be very soon. Somehow I doubt it will help, because people have had somewhat related problems with older GPUs. All attempts to change color settings seemed to fail there.

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tuubi Dec 15, 2019

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Okay. And how do you figure your GPU isn't using the full eight bit RGB range? I don't see anything in your xrandr output to that effect.

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Nonjuffo Dec 15, 2019

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Quoting: tuubiOkay. And how do you figure your GPU isn't using the full eight bit RGB range? I don't see anything in your xrandr output to that effect.

TV's input was initially set to "full range" and supposedly black screen looked grey. When I switched the input to "limited range" the picture was black again.

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Shmerl Dec 15, 2019

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That's the reason I avoid HDMI. It's awful with color and always has been for me. DP works a lot better. But HDMI cartel refuses to support DP in TVs, so it's a problem for those who use such devices.

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tuubi Dec 15, 2019

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Quoting: Nonjuffo
Quoting: tuubiOkay. And how do you figure your GPU isn't using the full eight bit RGB range? I don't see anything in your xrandr output to that effect.

TV's input was initially set to "full range" and supposedly black screen looked grey. When I switched the input to "limited range" the picture was black again.

Right. Well, this doesn't help you but my RX5700 XT doesn't seem to have that problem. My TV is connected via HDMI, it is set to "wide color space" (full 8 bit RGB range), and black is as black as it can do. Switching the TV to limited range doesn't make it any darker.

Last edited by tuubi on 15 December 2019 at 6:12 pm UTC

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Nonjuffo Dec 15, 2019

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Quoting: tuubiRight. Well, this doesn't help you but my RX5700 XT doesn't seem to have that problem. My TV is connected via HDMI, it is set to "wide color space" (full 8 bit RGB range), and black is as black as it can do. Switching the TV to limited range doesn't make it any darker.

So you are on Mesa 19.3? I wonder if this could be due to some OEM specific firmware differences (unlikely).

I could also try to update the TV's firmware, but that could introduce some unwanted crap I don't want to deal with. Maybe a last resort would be getting an active DP to HDMI converter, but I probably wont go that far with this.

Last edited by Nonjuffo on 15 December 2019 at 6:35 pm UTC

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Nonjuffo Dec 15, 2019

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Quoting: ShmerlThat's the reason I avoid HDMI. It's awful with color and always has been for me. DP works a lot better. But HDMI cartel refuses to support DP in TVs, so it's a problem for those who use such devices.

Yeah, unfortunately the price of proper big monitors is hard to rationalize beyond professional use.

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Shmerl Dec 15, 2019

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How big of a screen do you need?

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Nonjuffo Dec 16, 2019

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Quoting: ShmerlHow big of a screen do you need?

I'm not going to change the screen I have if that's what you're going after. It's quite nice and fine for the couch entertainment function. The only true fault is that it lacks DisplayPort, but I can live with that.

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