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amdgpu in kernel 4.15: HDMI monitor stuck in YPbPr
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Ant P.
Watchman
Watchman


Joined: 18 Apr 2009
Posts: 5008

PostPosted: Mon Feb 19, 2018 1:28 am    Post subject: amdgpu in kernel 4.15: HDMI monitor stuck in YPbPr Reply with quote

I'm using an RX550, kernel 4.15.4, with the amdgpu DC kernel option enabled and amdgpu.audio=1.

After upgrading to 4.15 I've found my video card is mangling HDMI output. I have a dual-monitor arrangement and my main one (attached via DisplayPort) looks fine, but the HDMI-connected second one has visible colour sub-sampling artifacts - red text on a dark terminal looks particularly awful and shimmers when I drag the window on that screen.

I remember there used to be an xrandr property to switch the colour format between rgb/ypbpr/tv_rgb, but I just checked and it's not there any more:
Code:
 ~ $ xrandr --verbose
Screen 0: minimum 320 x 200, current 5760 x 2160, maximum 16384 x 16384
DisplayPort-0 connected primary 3840x2160+0+0 (0x58) normal (normal left inverted right x axis y axis) 600mm x 340mm
        Identifier: 0x54
        Timestamp:  2297116
        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:
                00ffffffffffff001e6d095bd95f0800
                [...]
                000000000000000000000000000000c8
        TearFree: on
                supported: off, on, auto
        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
        non-desktop: 0
                range: (0, 1)
        link-status: Good
                supported: Good, Bad
  3840x2160 (0x58) 533.250MHz +HSync -VSync *current +preferred
        h: width  3840 start 3888 end 3920 total 4000 skew    0 clock 133.31KHz
        v: height 2160 start 2214 end 2219 total 2222           clock  60.00Hz
  [...]
  640x480 (0x6c) 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
HDMI-A-0 connected 1920x1200+3840+0 (0x6d) normal (normal left inverted right x
axis y axis) 518mm x 324mm
        Identifier: 0x55
        Timestamp:  2297116
        Subpixel:   unknown
        Gamma:      1.0:1.0:1.0
        Brightness: 1.0
        Clones:
        CRTC:       1
        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:
                00ffffffffffff0010ac16f04c4c3441
                [...]
                1800000000000000000000000000003e
        TearFree: on
                supported: off, on, auto
        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
        non-desktop: 0
                range: (0, 1)
        link-status: Good
                supported: Good, Bad
  1920x1200 (0x6d) 154.000MHz +HSync -VSync *current +preferred
        h: width  1920 start 1968 end 2000 total 2080 skew    0 clock  74.04KHz
        v: height 1200 start 1203 end 1209 total 1235           clock  59.95Hz
  [...]


There's nothing odd in dmesg or Xorg.0.log; X sees the display supports RGB 4:4:4 but isn't using it. I can't see anything DRM-related in /sys/ that'd let me change it either.

I've had similar problems with the radeon driver and HDMI in the past, but this is a new one to me.
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