melissawen/2024linuxdisplayhackfest

2024linuxdisplayhackfest's Issues

Hackfest schedule: feedback/suggestions

Slot distributions proposal (Central European Summer Time - CEST):

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Timeline

Tue, May 14 (CEST)

• 09:00 - 9:30: Walk to Igalia HQ
• 9:30 - 10:10: Welcome! (Igalia HQ)
• 10:10 - 11:40: Introduction (Participants & Topics)
• 11:40 - 12:00: 20-min break & chat
• 12:00 - 13:30: #6
• 13:30 - 14:30: Lunch time at HQ
• 14:30 - 16:00: #2
• 16:00 - 16:20: 20-min break & chat
• 16:20 - 18:30: #1
• 20:30: Hackfest Dinner (sponsored by Igalia)

Wed, May 15 (CEST)

• 09:00 - 9:30: Walk to Igalia HQ
• 9:30 - 10:10: Recap Previous Day (planning)
• 10:10 - 11:40: #5
• 11:40 - 12:00: 20-min break & chat
• 12:00 - 13:30: #4
• 13:30 - 14:30: Lunch time at HQ
• 14:30 - 16:00: #3
• 16:00 - 16:20: 20-min break & chat
• 16:20 - 18:30: #9

Thu, May 16 (CEST)

• 09:00 - 9:30: Walk to Igalia HQ
• 9:30 - 10:10: Recap Previous Day (planning)
• 10:10 - 11:40: #7 | #8
• 11:40 - 12:00: 20-min break & chat
• 12:00 - 13:30: #6 | #10
• 13:30 - 14:30: Lunch time at HQ
• 14:30 - 15:10: Wrapping-up
• 15:10 - 18:00: Social Activity

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Feel free to report here any clashes or time constraints or better ideas or whatever you think we can organize/do better.
Agenda: https://github.com/melissawen/2024linuxdisplayhackfest/wiki/Topics-&-Talks

Session: HDR & Color Management (Use-cases/Testing)

• HDR gainmap images and how should we think of HDR (Christopher Cameron - Google)
• VKMS/Testing/CI status-update and future work (Melissa - Igalia)

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Time: Tue 16:20-18:30 (CEST)
Lead(s): Christopher, Melissa
Possible topics:

• HDR gainmap images are amazing (and are a model of how we should think of HDR in general)
• Enabling HDR images and video on ChromeOS: Pain points and wish lists
• VKMS status-update and future plans
• Chamelium boards, video capture

Session: Strategy for video and gaming use-cases

• Multiplane support in compositors (Leo Li - AMD)
• HDR video in ChromeOS and how to (would like to) use overlays (Miguel Casas - Google)

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Time: Wed 16:20-18:30 (CEST)
Lead(s): Leo
Possible Topics:

• Multiplane support in compositors:
  • Underlay, overlay, or mixed strategy for video and gaming use-cases;
  • KMS Plane UAPI to simplify the plane arrangement problem;
  • Shared plane arrangement algorithm desired;
• Hardware overlays for HDR video

Session: HDR & Color Management (userspace)

Scope: user-space

• Linux Color Handling and Management (Sebastian Wick - Red Hat)

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Time: Wed 14:30-16:00 CEST
Lead(s): Sebastian
Possible topics:

• Wayland
  • color-management protocol status-update;
  • color-representation and video playback.

Session: HDR & Color Management (kernel)

Scope: kernel space

• AMD status update (Harry - AMD)
• Intel status-update (Uma - Intel)
• NVIDIA status-update (Alex G - NVIDIA)

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Time: Tue 14:30-16:00 (CEST)
Lead(s): Harry
Possible topics:

• Proposal with new DRM object type:
  • Presentation of GPU-vendors features;
  • Status-update of plane color management pipeline per vendor on Linux;
• Post-blending color pipeline

Session: Display Control

• Session Introduction (Sebastian - RedHat)

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Time: Thu 10:10-11:40 (CEST)
Lead(s): Sebastian
Possible Topics:

• HDR signalling status-update
• backlight status-update
• EDID and DDC/CI

Session: Power Savings vs Color/Latency

• Session Introduction (Mario - AMD)

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Time: Wed 12:00-13:30 CEST
Lead(s): Mario
Possible Topics:

• ABM (adaptive backlight management)
• PSR1 latencies
• How do we let drivers optimize for (a significant amount of) power, while being able to conserve color accuracy or latency requirements of the compositor?

Session: Content-Adaptive Scaling & Sharpening

• Session introduction (Harry - AMD)
• Status-update on Intel (Uma - Intel)

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Time: Thu 12:00-13:30 (CEST)
Leads: Harry, Uma
Possible topics:

• Content Adaptive Scalers on display hardware;
• New drm_colorop for content adaptive scaling;
• Proprietary algorithms.

Session: VRR & Frame timing

• Session Introduction: Xaver (BlueSystems/KDE)

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Time:

• Session 1: Tue 12:00-13:30 (CEST)
• Session 2: Thu 12:00-13:30 (CEST)

Lead(s): Xaver
Possible Topics:

• Frame timing:
  • Limitations of uAPI;
  • Current user space solutions;
  • Brainstorm better uAPI;
• Cursor/overlay plane updates with VRR;
• KMS commit and buffer-readiness deadlines;

Session: Display Mux

• Session Introduction (Mario - AMD)

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Time: Thu 10:10-11:40 (CEST)
Lead(s): Mario
Possible Topics:

• Laptop muxes for switching of the embedded panel between the integrated GPU and the discrete GPU;
• Seamless/atomic hand-off between drivers on Linux desktops.

Session: Real time scheduling & async KMS API

• Session Introduction: Xaver (BlueSystems/KDE)

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Time: Wed 10:10-11:40 (CEST)
Lead(s): Xaver
Possible topics:

• Using real time scheduling for handling KMS update scheduling opens up many possibilities, e.g. lower latency input feedback, potentially better VRR handling, buffer synchronization before handing to KMS
• Biggest hurdle right now is "async" uAPI usage sometimes block for a substantial amount of time (10+ frames) which in the worst case causes SIGKILL
• Drivers ideally should try hard to avoid blocking on async calls, or otherwise mark the process as waiting, when waiting for something