On 17/11/2024 12:48, Will McDonald wrote:
On Sun, 17 Nov 2024 at 11:10, lejeczek via users
<users@lists.fedoraproject.org> wrote:
It's been a while and I've changed my hardware setup -
which now makes it even more puzzling.
Now I have two "identical" Dell monitors - P2418D -
and colors are different, one has whites cooler
whereas the second's whites (thus other colors) are
warmer.
I've been playing with 'colormgr' but am unable to
make screens to look the same.
I've also done simple "factory reset" within monitors.
Perhaps that "warmth" is something else and 'colormgr'
cannot fix it - would anybody know?
Or hardware calibration - event though it's the same
monitor - is the only "fix" here?
Probably an obvious thing, but if you have 2 identical
displays with wildly different colour balances, have you
checked each display's "Color Preset Modes" in the OSD?
https://dl.dell.com/manuals/all-products/esuprt_electronics_accessories/esuprt_electronics_accessories_monitors/dell-p2418d-monitor_user's-guide_en-us.pdf
See page 38/39 of this PDF.
If this is set the same in each, then are you driving them
over different standards? e.g. HDMI for one and
DisplayPort for the other? Or one via a dock and one
direct from the laptop? That /might/ account for differences?
Color's "Preset Modes" was where I started - none of them
matched.
The closest match is - one with cooler whites: standard, the
one with warmer whites: Cool - but still visibly different.
Both monitors are directly connected to the same one Radeon
6600 and both via Display Ports.
-> $ colormgr get-devices
....
Object Path:
/org/freedesktop/ColorManager/devices/xrandr_Dell_Inc__DELL_P2418D_MY3ND81M0CST_pe243_1000
Owner: pe243
Created: November 17 2024, 10:40:19 AM
Modified: November 17 2024, 10:40:20 AM
Type: display
Enabled: Yes
Embedded: No
Model: DELL P2418D
Vendor: Dell
Serial: MY3ND81M0CST
Scope: temp
Colorspace: rgb
Device ID: xrandr-Dell Inc.-DELL P2418D-MY3ND81M0CST
Profile 1: icc-8586e1692cb7849ce289090f324d3c8d
/var/lib/colord/icc/edid-ea0cc21be9f6da7186ec375d96563ba7.icc
Profile 2: icc-c03f76b40d67c9ba8f4d14672e1fc643
/home/pe243/.local/share/icc/edid-729bf8a5cd20f6d444982f9769ee6954.icc
Metadata: OutputEdidMd5=729bf8a5cd20f6d444982f9769ee6954
Metadata: OutputPriority=primary
Metadata: XRANDR_name=DP-1
Object Path:
/org/freedesktop/ColorManager/devices/xrandr_Dell_Inc__DELL_P2418D_MY3ND82N1C2T_pe243_1000
Owner: pe243
Created: November 17 2024, 10:40:19 AM
Modified: November 17 2024, 10:40:20 AM
Type: display
Enabled: Yes
Embedded: No
Model: DELL P2418D
Vendor: Dell
Serial: MY3ND82N1C2T
Scope: temp
Colorspace: rgb
Device ID: xrandr-Dell Inc.-DELL P2418D-MY3ND82N1C2T
Profile 1: icc-8586e1692cb7849ce289090f324d3c8d
/var/lib/colord/icc/edid-ea0cc21be9f6da7186ec375d96563ba7.icc
Profile 2: icc-442decd6245bb35a867a0e455f1e6149
/home/pe243/.local/share/icc/edid-ea0cc21be9f6da7186ec375d96563ba7.icc
Metadata: OutputEdidMd5=ea0cc21be9f6da7186ec375d96563ba7
Metadata: OutputPriority=secondary
Metadata: XRANDR_name=DP-2
default profile, for both, is '
icc-8586e1692cb7849ce289090f324d3c8d' - which persists
across reboots.
I understand that Gnome/Wayland, regardless, creates
automatically, temporary profiles (which are different after
each OS boot) - is that true?
I'd like to think that I'm missing something obvious/trivial
- otherwise it is quite a puzzle to me.
thanks, L.
--
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