reply #30,
Agree, I think we should add GUI option for user to set it.
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Title:
Some external 4K monitor is not working properly
To manage notif
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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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 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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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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Title:
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 w
Upload the problem edid.
** Attachment added: "edid of the display with problem"
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1890772/+attachment/5399493/+files/edid-problem
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I forgot a display signal doesn't include any alpha channel, so yeah 8
bpc will require less bandwidth than 10 bpc.
The maximum capability of the monitor should be advertised in its EDID.
At least modern monitors do. You can check it using the 'edid-decode'
command and grepping for 'bits per prima
** Description changed:
The bug is originated from,
https://bugs.launchpad.net/somerville/+bug/1887915/
https://bugs.launchpad.net/somerville/+bug/1886778
It has some problem when user connect to external 4K monitor with refresh
rate 60.
The problem can be solved by lower the bpc, or
reply #20
yes, Daniel.
Originally, the display would like to use 10 bpc. but it is failed with some
dongle.
However, we found that, it uses 8bit color depth on Windows. We wonder if
Windows has done some magic for enhancing compatibilty. Maybe we can also
discuss if we can have some implementat
Note also that if you did have a machine that required:
xrandr --output DP-3 --set "max bpc" 8
on a 4K 60Hz display then that may indicate a bandwidth problem. Maybe a
limitation of the cable. Does a max bpc of 10 also work? What values
don't work?
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You received this bug notification becaus
There doesn't seem to be any external monitor connected to this machine,
or any 'DP-3' connector.
Please attach 'xrandr --verbose' info with a monitor connected showing
the problem, or please open a new bug from the affected machine.
** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)
** C
** Also affects: oem-priority
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1890772
Title:
Some external 4K monitor is not working properly
To manage not
apport information
** Tags added: apport-collected focal third-party-packages ubuntu
** Description changed:
The bug is originated from,
https://bugs.launchpad.net/somerville/+bug/1887915/
https://bugs.launchpad.net/somerville/+bug/1886778
It has some problem when user connect to exte
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