[BUG] how to get full RGB hdmi output on amd videocards with LE

rix81 · Mar 23rd 2019

Hello,

I have 2 amd videcards, AMD RX 460, and AMD Vega 200GE (integrated). With both of them LE outputs YCbcr limited.

How can I change it to full RGB 4:4:4 ?

Im trying to find solution for a long of time, but still nothing. My linux undesrtanding is highly limited. Could someone help pls?

Here's what xrandr --verbose does show, doesn't seem to have necessary option

Code

HDMI-A-0 connected 3840x2160+0+0 (0x58) normal (normal left inverted right x axi                                                                                                                                                             s y axis) 1872mm x 1053mm
        Identifier: 0x55
        Timestamp:  7192
        Subpixel:   unknown
        Gamma:      1.0:1.0:1.0
        Brightness: 1.0
        Clones:
        CRTC:       0
        CRTCs:      0 1 2 3 4
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter:
        EDID:
                00ffffffffffff004c2df70d000e0001
                011b0103806f3e780a23ada4544d9926
                0f474abdef80714f81c0810081809500
                a9c0b300010108e80030f2705a80b058
                8a00501d7400001e023a801871382d40
                582c4500501d7400001e000000fd0018
                4b0f873c000a202020202020000000fc
                0053414d53554e470a20202020200175
                020359f05761101f041305142021225d
                5e5f606566626364071603122c090707
                1507503d04c057070083010000e2000f
                e305c3016e030c002000b83c20008001
                02030467d85dc401788003e3060d01e3
                0f01e0e5018b849001011d80d0721c16
                20102c2580501d7400009e662156aa51
                001e30468f3300501d7400001e0000c3
        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: 59
                supported: 59
        non-desktop: 0
                range: (0, 1)

Display More

So far ive tried this https://openelec.tv/documentat…m-xorg-conf#color-space-1

xorg fails to run with this conf file.

sorry for my english

**Da Flex** · Mar 23rd 2019

I bet it's a monitor problem. I just did a "xrandr --verbose" at my Ubuntu Linux, and the output shows all available resolutions of my connected monitor. Those entries appear after your last output lines ("non-desktop: 0, range: (0, 1)"). And I get an additional RGB entry:

Code

Broadcast RGB: Automatic 
                supported: Automatic, Full, Limited 16:235

So, I think your LE and graphic cards work alright, but your monitor doesn't give the necessary response to activate RGB mode.

rix81 · Mar 23rd 2019

I think TV is not a problem here, because these amd videocards in windows10 output Full RGB without problems. Don't know why I don't have entries you mentioned.

Ive tried to conect tv not directly, but via dvi-hdmi adapter. That also limits hdmi version to 1.4. And i got Full RGB by default, without changing anything.

To check if it depends on hdmi version I've also installed pretty old AMD radeon 5450 videocard that has only hdmi 1.4. And it outputs Full RGB.

So probably it's kind of bug related to hdmi versions.

Any ideas how to workaround it?

**Da Flex** · Mar 23rd 2019

OK, you use exactly the same hardware (incl. DVI cable, which is sometimes a trouble maker), and RGB works on Windows 10, but doesn't works on LE, right? In that case it could be a DVI bug inside LE.

Using a DVI -> HDMI adapter sounds like the perfect workaround. Why don't you stay with it?

rix81 · Mar 24th 2019

yes, cables etc are the same.

DVI>HDMI adapter limits resolution to 1080p so can't be workaround.

**Da Flex** · Mar 24th 2019

Quote from rix81

yes, cables etc are the same.

DVI>HDMI adapter limits resolution to 1080p so can't be workaround.

Thank you. I think HDMI connection is more tested by developers, compared to DVI. It really could be a bug, and a developer should have a look at this. If you want to help to fix it, you could deliver the output of "xrandr --verbose" when using the DVI -> HDMI adapter. That should show some comparable differences.

rix81 · Mar 25th 2019

i think it's bug because color space and range should not depend on hdmi version

here's output

Code

DVI-D-0 connected 1920x1080+0+0 (0x64) normal (normal left inverted right x axis                                                                                                                                                              y axis) 1872mm x 1053mm
        Identifier: 0x56
        Timestamp:  48041
        Subpixel:   unknown
        Gamma:      1.0:1.0:1.0
        Brightness: 1.0
        Clones:
        CRTC:       0
        CRTCs:      0 1 2 3 4
        Transform:  1.000000 0.000000 0.000000
                    0.000000 1.000000 0.000000
                    0.000000 0.000000 1.000000
                   filter:
        EDID:
                00ffffffffffff004c2df70d000e0001
                011b0103806f3e780a23ada4544d9926
                0f474abdef80714f81c0810081809500
                a9c0b300010108e80030f2705a80b058
                8a00501d7400001e023a801871382d40
                582c4500501d7400001e000000fd0018
                4b0f873c000a202020202020000000fc
                0053414d53554e470a20202020200175
                020359f05761101f041305142021225d
                5e5f606566626364071603122c090707
                1507503d04c057070083010000e2000f
                e305c3016e030c002000b83c20008001
                02030467d85dc401788003e3060d01e3
                0f01e0e5018b849001011d80d0721c16
                20102c2580501d7400009e662156aa51
                001e30468f3300501d7400001e0000c3
        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
        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: 62
                supported: 62
        non-desktop: 0
                range: (0, 1)
  4096x2160 (0x58) 297.000MHz +HSync +VSync
        h: width  4096 start 4184 end 4272 total 4400 skew    0 clock  67.50KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  30.00Hz
  4096x2160 (0x59) 297.000MHz +HSync +VSync
        h: width  4096 start 5064 end 5152 total 5280 skew    0 clock  56.25KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  25.00Hz
  4096x2160 (0x5a) 297.000MHz +HSync +VSync
        h: width  4096 start 5116 end 5204 total 5500 skew    0 clock  54.00KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  24.00Hz
  4096x2160 (0x5b) 296.703MHz +HSync +VSync
        h: width  4096 start 4184 end 4272 total 4400 skew    0 clock  67.43KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  29.97Hz
  4096x2160 (0x5c) 296.703MHz +HSync +VSync
        h: width  4096 start 5116 end 5204 total 5500 skew    0 clock  53.95KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  23.98Hz
  3840x2160 (0x5d) 297.000MHz +HSync +VSync
        h: width  3840 start 4016 end 4104 total 4400 skew    0 clock  67.50KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  30.00Hz
  3840x2160 (0x5e) 297.000MHz +HSync +VSync
        h: width  3840 start 4896 end 4984 total 5280 skew    0 clock  56.25KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  25.00Hz
  3840x2160 (0x5f) 297.000MHz +HSync +VSync
        h: width  3840 start 5116 end 5204 total 5500 skew    0 clock  54.00KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  24.00Hz
  3840x2160 (0x60) 296.703MHz +HSync +VSync
        h: width  3840 start 4016 end 4104 total 4400 skew    0 clock  67.43KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  29.97Hz
  3840x2160 (0x61) 296.703MHz +HSync +VSync
        h: width  3840 start 5116 end 5204 total 5500 skew    0 clock  53.95KHz
        v: height 2160 start 2168 end 2178 total 2250           clock  23.98Hz
  1920x1080 (0x62) 148.500MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  67.50KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  60.00Hz
  1920x1080 (0x63) 148.500MHz +HSync +VSync
        h: width  1920 start 2448 end 2492 total 2640 skew    0 clock  56.25KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  50.00Hz
  1920x1080 (0x64) 148.352MHz +HSync +VSync *current
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  67.43KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  59.94Hz
  1920x1080 (0x65) 74.250MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  33.75KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  30.00Hz
  1920x1080 (0x66) 74.250MHz +HSync +VSync
        h: width  1920 start 2448 end 2492 total 2640 skew    0 clock  28.12KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  25.00Hz
  1920x1080 (0x67) 74.250MHz +HSync +VSync
        h: width  1920 start 2558 end 2602 total 2750 skew    0 clock  27.00KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  24.00Hz
  1920x1080 (0x68) 74.176MHz +HSync +VSync
        h: width  1920 start 2008 end 2052 total 2200 skew    0 clock  33.72KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  29.97Hz
  1920x1080 (0x69) 74.176MHz +HSync +VSync
        h: width  1920 start 2558 end 2602 total 2750 skew    0 clock  26.97KHz
        v: height 1080 start 1084 end 1089 total 1125           clock  23.98Hz
  1680x1050 (0x6a) 119.000MHz +HSync -VSync
        h: width  1680 start 1728 end 1760 total 1840 skew    0 clock  64.67KHz
        v: height 1050 start 1053 end 1059 total 1080           clock  59.88Hz
  1600x900 (0x6b) 108.000MHz +HSync +VSync
        h: width  1600 start 1624 end 1704 total 1800 skew    0 clock  60.00KHz
        v: height  900 start  901 end  904 total 1000           clock  60.00Hz
  1280x1024 (0x6c) 135.000MHz +HSync +VSync
        h: width  1280 start 1296 end 1440 total 1688 skew    0 clock  79.98KHz
        v: height 1024 start 1025 end 1028 total 1066           clock  75.02Hz
  1280x1024 (0x6d) 108.000MHz +HSync +VSync
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock  63.98KHz
        v: height 1024 start 1025 end 1028 total 1066           clock  60.02Hz
  1440x900 (0x6e) 88.750MHz +HSync -VSync
        h: width  1440 start 1488 end 1520 total 1600 skew    0 clock  55.47KHz
        v: height  900 start  903 end  909 total  926           clock  59.90Hz
  1366x768 (0x6f) 85.500MHz +HSync +VSync
        h: width  1366 start 1436 end 1579 total 1792 skew    0 clock  47.71KHz
        v: height  768 start  771 end  774 total  798           clock  59.79Hz
  1280x800 (0x70) 71.000MHz +HSync -VSync
        h: width  1280 start 1328 end 1360 total 1440 skew    0 clock  49.31KHz
        v: height  800 start  803 end  809 total  823           clock  59.91Hz
  1152x864 (0x71) 108.000MHz +HSync +VSync
        h: width  1152 start 1216 end 1344 total 1600 skew    0 clock  67.50KHz
        v: height  864 start  865 end  868 total  900           clock  75.00Hz
  1280x720 (0x72) 74.250MHz +HSync +VSync
        h: width  1280 start 1390 end 1430 total 1650 skew    0 clock  45.00KHz
        v: height  720 start  725 end  730 total  750           clock  60.00Hz
  1280x720 (0x73) 74.250MHz +HSync +VSync
        h: width  1280 start 1720 end 1760 total 1980 skew    0 clock  37.50KHz
        v: height  720 start  725 end  730 total  750           clock  50.00Hz
  1280x720 (0x74) 74.176MHz +HSync +VSync
        h: width  1280 start 1390 end 1430 total 1650 skew    0 clock  44.96KHz
        v: height  720 start  725 end  730 total  750           clock  59.94Hz
  1024x768 (0x75) 78.750MHz +HSync +VSync
        h: width  1024 start 1040 end 1136 total 1312 skew    0 clock  60.02KHz
        v: height  768 start  769 end  772 total  800           clock  75.03Hz
  1024x768 (0x76) 75.000MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1328 skew    0 clock  56.48KHz
        v: height  768 start  771 end  777 total  806           clock  70.07Hz
  1024x768 (0x77) 65.000MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock  48.36KHz
        v: height  768 start  771 end  777 total  806           clock  60.00Hz
  832x624 (0x78) 57.284MHz -HSync -VSync
        h: width   832 start  864 end  928 total 1152 skew    0 clock  49.73KHz
        v: height  624 start  625 end  628 total  667           clock  74.55Hz
  800x600 (0x79) 50.000MHz +HSync +VSync
        h: width   800 start  856 end  976 total 1040 skew    0 clock  48.08KHz
        v: height  600 start  637 end  643 total  666           clock  72.19Hz
  800x600 (0x7a) 49.500MHz +HSync +VSync
        h: width   800 start  816 end  896 total 1056 skew    0 clock  46.88KHz
        v: height  600 start  601 end  604 total  625           clock  75.00Hz
  800x600 (0x7b) 40.000MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock  37.88KHz
        v: height  600 start  601 end  605 total  628           clock  60.32Hz
  720x576 (0x7c) 27.000MHz -HSync -VSync
        h: width   720 start  732 end  796 total  864 skew    0 clock  31.25KHz
        v: height  576 start  581 end  586 total  625           clock  50.00Hz
  720x480 (0x7d) 27.027MHz -HSync -VSync
        h: width   720 start  736 end  798 total  858 skew    0 clock  31.50KHz
        v: height  480 start  489 end  495 total  525           clock  60.00Hz
  720x480 (0x7e) 27.000MHz -HSync -VSync
        h: width   720 start  736 end  798 total  858 skew    0 clock  31.47KHz
        v: height  480 start  489 end  495 total  525           clock  59.94Hz
  640x480 (0x7f) 31.500MHz -HSync -VSync
        h: width   640 start  656 end  720 total  840 skew    0 clock  37.50KHz
        v: height  480 start  481 end  484 total  500           clock  75.00Hz
  640x480 (0x80) 31.500MHz -HSync -VSync
        h: width   640 start  664 end  704 total  832 skew    0 clock  37.86KHz
        v: height  480 start  489 end  492 total  520           clock  72.81Hz
  640x480 (0x81) 30.240MHz -HSync -VSync
        h: width   640 start  704 end  768 total  864 skew    0 clock  35.00KHz
        v: height  480 start  483 end  486 total  525           clock  66.67Hz
  640x480 (0x82) 25.200MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock  31.50KHz
        v: height  480 start  490 end  492 total  525           clock  60.00Hz
  640x480 (0x83) 25.175MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock  31.47KHz
        v: height  480 start  490 end  492 total  525           clock  59.94Hz
  720x400 (0x84) 28.320MHz -HSync +VSync
        h: width   720 start  738 end  846 total  900 skew    0 clock  31.47KHz
        v: height  400 start  412 end  414 total  449           clock  70.08Hz

Display More

btw, its odd that it shows 4096x2160 available , because highest resolution supported via this adapter is 1080p. Possibly another bug, but it's not important for me.

**Da Flex** · Mar 25th 2019

The new output looks much better. Yes, color space is independent of HDMI or DVI mode. All resolutions of the target device do appear. That's no bug, because the adapter transmits the complete abilities of the target device without filtering.

I was unable to send a developer a PM, because the function is blocked from his side. But you can still change thread title, and mark it as [BUG] to get developer attention. If that doesn't lead to any response, you can start a new thread in the "Bug Report" sub-forum.

rix81 · Apr 30th 2020

after 1 year, still looking for solution. Any help would be appreciated

**Da Flex** · May 1st 2020

After reading the thread again, I found a point we haven't discussed yet. Can you please verify that your HDMI cable is HDMI 2.0 or 2.1 standard? It's weird that a DVI -> HDMI adapter limits the resolution. Maybe actually the cable limits data transfer speed, resulting in a reduced color space.

smp · May 1st 2020

This is not configurable from userspace. If the display's EDID report YCbCr 4:4:4 support - AMD driver will use that instead of RGB. If for whatever reason you want to force RGB then make changes to the AMDGPU source code or use a custom EDID.

rix81 · May 1st 2020

at last.......... finally managed to do it! thank you for help and suggestion to use custom EDID

Ive used this guide (on bottom) to get edid.bin from libreelec

then disabled YCbCr with EEditGold software in windows

then copy back edid.bin to libreelec and continue with guide

thank you