[Bug 105149] New: Broadcast RGB defaults to using Limited 16:235 ouput
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Sat Feb 17 21:10:17 UTC 2018
https://bugs.freedesktop.org/show_bug.cgi?id=105149
Bug ID: 105149
Summary: Broadcast RGB defaults to using Limited 16:235 ouput
Product: DRI
Version: XOrg git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: DRM/Intel
Assignee: intel-gfx-bugs at lists.freedesktop.org
Reporter: kurt at roeckx.be
QA Contact: intel-gfx-bugs at lists.freedesktop.org
CC: intel-gfx-bugs at lists.freedesktop.org
I just got myself a new screen, an iiyama XB2483HSU-B3 connected over HDMI.
When I plugged it in, I was very surprised to see a grey background that is
supposed to be black since it's supposed to have a 3000:1 contrast ratio. I
tried to change the default refresh rate from 60 to 75 and then I actually got
black.
After some digging, I found that it might be related to the "Broadcast RGB"
property. The output from xrandr --prop by default is:
HDMI-3 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 527mm
x 296mm
_ICC_PROFILE: 0 0 14 148 97 114 103 108 2 32 0 0 109 110 116 114
82 71 66 32 88 89 90 32 7 226 0 2 0 15 0 22
0 35 0 24 97 99 115 112 42 110 105 120 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 1 0 0 246 214 0 1 0 0 0 0 211 45
97 114 103 108 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 13 100 101 115 99 0 0 1 32 0 0 0 101
99 112 114 116 0 0 1 136 0 0 0 47 108 117 109 105
0 0 1 184 0 0 0 20 119 116 112 116 0 0 1 204
0 0 0 20 98 107 112 116 0 0 1 224 0 0 0 20
118 99 103 116 0 0 1 244 0 0 6 18 114 88 89 90
0 0 8 8 0 0 0 20 103 88 89 90 0 0 8 28
0 0 0 20 98 88 89 90 0 0 8 48 0 0 0 20
114 84 82 67 0 0 8 68 0 0 2 12 103 84 82 67
0 0 10 80 0 0 2 12 98 84 82 67 0 0 12 92
0 0 2 12 97 114 116 115 0 0 14 104 0 0 0 44
100 101 115 99 0 0 0 0 0 0 0 11 105 105 121 97
109 97 46 105 99 99 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 116 101 120 116 0 0 0 0
EDID:
00ffffffffffff0026cd2861b6080000
321b010380351e782aa1a5a755529f27
125054a56b80710081408180a940b300
9500d1c00101023a801871382d40582c
45000f282100001e000000ff00313135
36343735303232323330000000fd0037
4c1e5312000a202020202020000000fc
0058323438332f323438310a20200176
020322f14f9005040302011112131406
0715161f230907018301000065030c00
1000023a801871382d40582c45000f28
2100001f011d80d0721c1620102c2580
0f282100009e011d00bc52d01e20b828
55400f282100001e2a4480a070382740
302035000f282100001a023a80d07238
2d40102c45800f282100001e00000017
aspect ratio: Automatic
supported: Automatic, 4:3, 16:9
Broadcast RGB: Automatic
supported: Automatic, Full, Limited 16:235
audio: auto
supported: force-dvi, off, auto, on
link-status: Good
supported: Good, Bad
1920x1080 60.00*+ 74.97 50.00 59.94
1920x1080i 60.00 50.00 59.94
1600x1200 60.00
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 59.90
1280x960 60.00
1152x864 75.00
1280x720 60.00 50.00 59.94
1152x720 59.97
1024x768 75.03 60.00
832x624 74.55
800x600 75.00 60.32
720x576 50.00
720x576i 50.00
720x480 60.00 59.94
720x480i 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
But if I do this: xrandr --output HDMI-3 --set "Broadcast RGB" "Full"
The black becomes black. So it seems that by default it's doing "Limited
16:235" for some reason.
The only other way I could get proper black was using 1920x1080 at 75.
I'm running Debian's 4.14.13-1 kernel. I have an intel i5-2500
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