NOTE: This hackfest is currently a (n advanced) proposal awaiting from budget approval from Red Hat and availability of key attendees from outside Red Hat.

Shell & Display Next hackfest

Brno, First two weeks of November, currently proposed: 7th - 9th November

Primary contact: Carlos Soriano Sanchez <>
Secondary contact: Tomas Popela <>

Relevant GNOME team

Shell & mutter, possibly Design. Teams outside of GNOME will be key too, for KMS/DRM, Mesa, etc.


Planning and development of the technical infrastructure for various features for display-next technologies, specifically those that need GNOME Shell to work in tandem with the GPU stack. One of the main examples of this is HDR support.

This hackfest intends to put together engineers across the display/GPU stack, including folks from freedesktop and the upstream kernel. It's a great opportunity for GNOMErs to meet and collaborate with members of other communities.

The proposed length of the hackfest is 2 full days and a third day for wrapping up during the morning and doing some local activity during the afternoon.

Agenda, goals

Goals The main goal is to plan the next 1-2 years of work and direction in how to support HDR, VRR and other new GPU and graphics technologies that are exposed to the final user through Mutter and Shell.

In addition, the second main goal is to discuss, plan and agree on how to improve KMS and Wayland APIs to better accommodate user space needs for these technologies, specially necessary for HDR.

The third main but optional goal is for the UXD team to discuss the next iteration of Shell designs, and expose their needs to the GPU, graphics and Shell/Mutter engineers to gather feedback on what's feasible and what APIs would be necessary.


  • HDR - Leads: Jonas, Sebastian, Benjamin
    • State of the art
    • Roadmap
    • Addressing needs and pains from KMS
  • VRR - Leads: Michel
    • State of the art
    • Addressing apps bogging down Mutter
  • KMS properties – Leads: $ANYONE?
    • Kind of overlaps with the HDR part
    • Maybe also if something needs to be integrated with Hans De Goede’s recent rework
  • Direct scanout on non-compositing GPUs - Leads: Michel, Jonas
    • NVIDIA Advanced Optimus equivalency
    • Use cases and possible gains
    • Missing pieces - KMS APIs, Mutter, driver support, etc.
    • Coming up with a roadmap
  • UXD - Leads: AllanDay, JakubSteiner, TobiasBernard

    • Optional, potential separate track to the rest of the event
    • We have a number of shell design topics on the backlog, though whether we’ll be in a position to tackle these in the autumn is unclear

Code of Conduct

As for all GNOME-related events, the GNOME Events Code of Conduct and CodeOfConduct/PhotographyPolicy apply.

Any violations of either should be submitted to the event organizers (see above) or the GNOME Code of Conduct Committee


  • 6th November: attendees arrive
  • 7th November: plan work
  • 8th November: do work
  • 9th November: wrap up during the morning, sponsored activity (TBD) by Red Hat during the afternoon.


Red Hat will sponsor the Venue and Red Hatters accommodation and travel attending. Additionally, Red Hat will sponsor a small activity (TBD) during the afternoon of the last day for everyone attending.


(!) <list of attendees and their interests, you may want to include where attendees are staying>


Relevant contribution/aim

Arrives on

Departs on

Staying at

Michel Daenzer

full GPU stack: drm/kms, VRR, Mesa

Niels de Graef

Red Hat GPU team PO for HDR

Hans de Goede

Kernel client development

Sebastian Wick

HDR full stack developer

Jonas Adahl

Mutter maintainer

Carlos Soriano

logistics and Red Hat GPU team coordination

Allan Day


Benjamin Otte

GTK GL/color mgmt work with Sebastian, synchronizing client and compositor-side needs and technologies

Carlos Garnacho

Mutter maintainer

Florian Muellner

Shell maintainer

Identified possible key attendees (add your name in the table above for confirming attendance and edit your relevant contribution)


Relevant contribution/aim

Ville Syrjala

Intel kernel display developer

Pekka Paalanen (pq)

Wayland maintainer

Daniel Vetter

Intel DRM maintainer

Harry Wentland

AMD - exposing per plane color

Dor Askayo

VRR contributor

Robert Mader

YUV support and firefox graphics related work

Georges Basiel Stavracas Neto

Mutter/GNOME Shell maintainer

Uma Shankar

Intel - exposing per plane color

Melissa Wen

Igalia - KMS CRTC 3D LUT

Marco Trevisan

Canonical - Shell and Mutter contributor

Costs - €70 night

Flights from EU around €200 to either Vienna or Prague. Then Student Agency train from any of those cities to Brno around €12.

How to get there

From Europe or faraway places

  • Fly to Vienna or Prague airport
  • Direct bus from the airport bus stations to Brno through Reservation required in advance through that website.

  • Alternatively, train from those cities to Brno through too.

    • From Vienna airport, you will need to take a regular train to Vienna hbf (main train station a.k.a. hauptbahnhof). The regular train goes every 20 min aprox and tickets can be bought in the Vienna airport machines directly and takes around 30 min travel. Then you can take the Student Agency train to Brno from VIenna hbf.
    • From Prague, you can take a bus to the main train station (a.k.a. Hlavni Nadrazi) through regular city buses in the Prague airport. A ticket can be bought in the yellow colored machines directly in the bus stations of the airport (Czech crown coins required I believe).


Brno VUT Red Hat Lab.,+Brno+University+of+Technology/@49.2263222,16.5953662,19.62z/data=!4m5!3m4!1s0x471294099dc06bbb:0xbfcf161b01a48b0d!8m2!3d49.2264571!4d16.5959257

You can get to the venue by tram number 1 or 6 in tram stop Semilasso. You can use the PubTram android and ios app to get times for the trams (every 7 min).

Accommodation and food


3 monkeys (U 3 opic) - - variety of food at reasonable price and quality.

Pad Thai - - Reasonable quality and priced Thai food, including vegetarian options.

Forky's - - Excellent modern vegan restaurant in the center. 20 min tram trip from the Venue.

Accomodation - - best is tram number 1 or 6 to tram stop Hrnčířská, then walk down 5 minutes to the hotel, total 19 min. Alternatively, Bus 67 from bus stop Slovanské náměstí to bus stop Sportovní gets you just in front of the hotel in 24 min.

Previous discussions, organization threads, drafts, relevant links, etc

(!) <list of any resource like mailing lists, forums, wiki pages, etc where this has been discussed so far>

(!) Note to organizers
it is expected that you have contacted relevant teams or groups for your hackfest prior to proposing it, for example if you plan to do an Art hackfest, contact the Art team for ideas.


Hackfests/ShellDisplayNext2022 (last edited 2022-06-27 12:32:34 by JonasAdahl)