KMS Color Management Workshop Report (Melissa Wen)

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A brief summary of the discussions that happened in the KMS Color Management Workshop. (c) X.Org Developer's Conference (XDC) 2023 October 17-19, 2023 A Coruña (Spain) https://indico.freedesktop.org/event/4/

Technology

KMS Color Management Workshop
Report
Melissa Wen
XDC 2023 - A Coruña - Spain

Participants
José Exposito (Red Hat)
Michel Danzer (Red Hat)
Niels De Graef (Red Hat)
Harry Wentland (AMD)
Pekka Paalanen (Collabora)
Liviu Dudau (Arm)
Sebastian Wick (Red Hat)
Vikas Korjani (AMD)
Shashank Sharma (AMD)
KMS Color Management Workshop
Melissa Wen - XDC 2023
Jonas Ådahl (Red Hat)
Uday Kiran (AMD)
Da Xue (Libre Computer)
Hector Martin (Asahi Linux)
Sasha McIntosh (Google)
Daniel Stone (Collabora)
Victoria Brekenfeld (System76)
Simon Ser (SourceHut)
Michał Sawicz (Ubuntu/Canonical)
Melissa Wen (Igalia)
Carlos Soriano (Red Hat)
Alex Goins (NVIDIA)
Jeremy Selan (Valve)
Joshua Ashton (Valve)
Xaver Hugl (KDE/BlueSytems)
Dmitry Baryshkov (Linaro)
Abhinav Kumar (Qualcomm)
Marijn Suijten (Traverse Research)

Shell & Display Next Hackfest
Brno - CZ, 24-26 April inclusive
https://wiki.gnome.org/Hackfests/ShellDisplayNext2023
Agreements:
Short-term plan: AMD driver-speciﬁc color properties
Long-term plan: KMS Generic API
- Prescriptive: A list of available hardware blocks
- Testing: writeback, VKMS, etc.
- New property: color_pipeline
- New KMS object type: COLOROP
KMS Color Management Workshop
Melissa Wen - XDC 2023

Hackfest Follow-Up
[RFC] Plane color pipeline KMS uAPI - Simon Ser
[RFC 00/33] Add Support for Plane Color Pipeline - Uma Shankar
[RFC PATCH 00/10] Color Pipeline API w/ VKMS - Harry Wentland
[PATCH v4 00/32] drm/amd/display: add AMD driver-speciﬁc properties for color mgmt - Melissa Wen
KMS Color Management Workshop
Melissa Wen - XDC 2023

Discussions
- Conﬂicts between existing pre-blending and post-blending color properties
- New generic API implementation on VKMS: lessons learned
- Better testing with a writeback connector
- Variety of capabilities for color transformations and NVIDIA color singularities
- Latency issue when updating 3D LUTs
- Async LUT update
- Benchmarks
- Looking for a general uAPI solution
KMS Color Management Workshop
Melissa Wen - XDC 2023

Discussions
- Precision guarantees
- Hardware speciﬁc implementations: segmented LUT
- Bit-by-bit equality is a lost cause
- Evaluate it throughout each iteration
- Very simple API ﬁrst and a more complex later
- Userspace needs to always be able to fallback to shaders: no implicit assumptions
KMS Color Management Workshop
Melissa Wen - XDC 2023

Next steps
Reference/start point: "[RFC PATCH 00/10] Color Pipeline API w/ VKMS - Harry Wentland"
- Focus on having more vendors build upon that ^^
- Check 3D LUT performance
- Don’t go too deep with VKMS
KMS Color Management Workshop
Melissa Wen - XDC 2023

2024 Display Hackfest
Igalia HQ - A Coruña, Spain - April/May 2024
Melissa Wen :)
mwen<at>igalia.com
KMS Color Management Workshop
Melissa Wen - XDC 2023

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Three things you will take away from the session: • How to run an effective tenant-to-tenant migration • Best practices for before, during, and after migration • Tips for using migration as a springboard to prepare for Copilot in Microsoft 365 Main ideas: Migration Overview: The presentation covers the current reality of cross-tenant migrations, the triggers, phases, best practices, and benefits of a successful tenant migration Considerations: When considering a migration, it is important to consider the migration scope, performance, customization, flexibility, user-friendly interface, automation, monitoring, support, training, scalability, data integrity, data security, cost, and licensing structure Next Wave: The next wave of change includes the launch of Copilot, which requires businesses to be prepared for upcoming changes related to Copilot and the cloud, and to consolidate data and tighten governance ShareGate: ShareGate can help with pre-migration analysis, configurable migration tool, and automated, end-user driven collaborative governance

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1. KMS Color Management Workshop Report Melissa Wen XDC 2023 - A Coruña - Spain

2. Participants José Exposito (Red Hat) Michel Danzer (Red Hat) Niels De Graef (Red Hat) Harry Wentland (AMD) Pekka Paalanen (Collabora) Liviu Dudau (Arm) Sebastian Wick (Red Hat) Vikas Korjani (AMD) Shashank Sharma (AMD) KMS Color Management Workshop Melissa Wen - XDC 2023 Jonas Ådahl (Red Hat) Uday Kiran (AMD) Da Xue (Libre Computer) Hector Martin (Asahi Linux) Sasha McIntosh (Google) Daniel Stone (Collabora) Victoria Brekenfeld (System76) Simon Ser (SourceHut) Michał Sawicz (Ubuntu/Canonical) Melissa Wen (Igalia) Carlos Soriano (Red Hat) Alex Goins (NVIDIA) Jeremy Selan (Valve) Joshua Ashton (Valve) Xaver Hugl (KDE/BlueSytems) Dmitry Baryshkov (Linaro) Abhinav Kumar (Qualcomm) Marijn Suijten (Traverse Research)

3. Shell & Display Next Hackfest Brno - CZ, 24-26 April inclusive https://wiki.gnome.org/Hackfests/ShellDisplayNext2023 Agreements: Short-term plan: AMD driver-speciﬁc color properties Long-term plan: KMS Generic API - Prescriptive: A list of available hardware blocks - Testing: writeback, VKMS, etc. - New property: color_pipeline - New KMS object type: COLOROP KMS Color Management Workshop Melissa Wen - XDC 2023

4. Hackfest Follow-Up [RFC] Plane color pipeline KMS uAPI - Simon Ser [RFC 00/33] Add Support for Plane Color Pipeline - Uma Shankar [RFC PATCH 00/10] Color Pipeline API w/ VKMS - Harry Wentland [PATCH v4 00/32] drm/amd/display: add AMD driver-speciﬁc properties for color mgmt - Melissa Wen KMS Color Management Workshop Melissa Wen - XDC 2023

5. Discussions - Conﬂicts between existing pre-blending and post-blending color properties - New generic API implementation on VKMS: lessons learned - Better testing with a writeback connector - Variety of capabilities for color transformations and NVIDIA color singularities - Latency issue when updating 3D LUTs - Async LUT update - Benchmarks - Looking for a general uAPI solution KMS Color Management Workshop Melissa Wen - XDC 2023

6. Discussions - Precision guarantees - Hardware speciﬁc implementations: segmented LUT - Bit-by-bit equality is a lost cause - Evaluate it throughout each iteration - Very simple API ﬁrst and a more complex later - Userspace needs to always be able to fallback to shaders: no implicit assumptions KMS Color Management Workshop Melissa Wen - XDC 2023

7. Next steps Reference/start point: "[RFC PATCH 00/10] Color Pipeline API w/ VKMS - Harry Wentland" - Focus on having more vendors build upon that ^^ - Check 3D LUT performance - Don’t go too deep with VKMS KMS Color Management Workshop Melissa Wen - XDC 2023

8. 2024 Display Hackfest Igalia HQ - A Coruña, Spain - April/May 2024 Melissa Wen :) mwen<at>igalia.com KMS Color Management Workshop Melissa Wen - XDC 2023

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