reply #30,
Agree, I think we should add GUI option for user to set it.
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https://bugs.launchpad.net/bugs/1890772
Title:
Some external 4K monitor is not working properly
Yeah the world is full of subtle connection problems. In this particular
case, dropping back to 8bps would fix it. But I'm not sure how we would
detect that, or if it's even the right thing to do in most cases.
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I guess Windows is good at compatibility and defaulting to 8bpc is safe.
But unless we have a GUI that allows users to then select 10bpc,
defaulting to 8bpc is not something we should do.
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Yeah the world is full of subtle connection problems. In this particular
case, dropping back to 8bpc would fix it. But I'm not sure how we would
detect that automatically, or if it's even the right thing to do in most
cases.
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Regaring comment #26, I am using PX UH-1.2MX HDMI 2.0 certified Premium
High Speed cable so the cable's quality should not be a problem.
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My monitor is EDID 1.3 and it has the same problem.
edid-decode (hex):
00 ff ff ff ff ff ff 00 41 0c 8f c1 bd 07 00 00
08 1d 01 03 80 3c 22 78 2a 67 a1 a5 55 4d a2 27
0e 50 54 bf ef 00 d1 c0 b3 00 95 00 81 80 81 40
81 c0 01 01 01 01 4d d0 00 a0 f0 70 3e 80 30 20
35 00 55 50 21 00 00 1a a3 66
Thanks that does seem to be an old EDID v1.3 with no defined bit depth.
But there are some vendor-specific blocks there that do advertise
support for 10bpc and 12bpc.
In this case I think it's correct to try and default to 10bpc or 12bpc.
It's probably only the cable or dongle letting it down. I
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