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ort xdc 2024 in montreal was another fantastic gathering for the linux graphics community it was again a great time to immerse in the world of graphics development engage in stimulating conversations and learn from inspiring developers many igalia colleagues and i participated in the conference again delivering multiple talks about our work on the linux graphics stack and also organizing the display kms meeting this blog post is a detailed report on the display kms meeting held during this xdc edition short on time catch the lightning talk summarizing the meeting here you can even speed up 2x for a quick written 25 sep 2024 igalia reflections on 2024 linux display next hackfest hey everyone the 2024 linux display next hackfest concluded in may and its outcomes continue to shape the linux display stack igalia hosted this year s event in a coruña spain bringing together leading experts in the field samuel iglesias and i organized this year s edition and this blog post summarizes the experience and its fruits one of the highlights of this year s hackfest was the wide range of backgrounds represented by our 40 participants both on site and remotely developers and experts from various companies and open source projects came together to advance the linux display ecosystem you can find the list 7 may 2024 igalia get ready to 2024 linux display next hackfest in a coruña we re excited to announce the details of our upcoming 2024 linux display next hackfest in the beautiful city of a coruña spain this year s hackfest will be hosted by igalia and will take place from may 14th to 16th it will be a gathering of minds from a diverse range of companies and open source projects all coming together to share learn and collaborate outside the traditional conference format who s joining the fun we re excited to welcome participants from various backgrounds including gpu hardware vendors linux distributions linux desktop environments and compositors color experts researchers and enthusiasts this diverse mix 16 feb 2024 igalia keep an eye out we are preparing the 2024 linux display next hackfest igalia is preparing the 2024 linux display next hackfest and we are thrilled to announce that this year s hackfest will take place from may 14th to 16th at our hq in a coruña spain this unconference style event aims to bring together the most relevant players in the linux display community to tackle current challenges and chart the future of the display stack key goals for the hackfest include releasing the power of collaboration we ll work to remove bottlenecks and pave the way for smoother more performant displays problem solving powerhouse brainstorming sessions and collaborative coding will target issues like hdr color 20 dec 2023 igalia the rainbow treasure map talk advanced color management on linux with amd steam deck last week marked a major milestone for me the amd driver specific color management properties reached the upstream linux next and to celebrate i m happy to share the slides notes from my 2023 xdc talk the rainbow treasure map along with the individual recording that just dropped last week on youtube talk about happy coincidences steam deck rainbow treasure map magic frogs while i may be bubbly and chatty in everyday life the stage isn t exactly my comfort zone hallway talks are more my speed but the journey of developing the amd color management properties was so full of discoveries 13 dec 2023 igalia 15 tips for debugging issues in the amd display kernel driver a self help guide for examining and debugging the amd display driver within the linux kernel drm subsystem it s based on my experience as an external developer working on the driver and are shared with the goal of helping others navigate the driver code acknowledgments these tips were gathered thanks to the countless help received from amd developers during the driver development process the list below was obtained by examining open source code reviewing public documentation playing with tools asking in public forums and also with the help of my former gsoc mentor rodrigo siqueira pre debugging steps before diving into an issue 7 nov 2023 igalia amd driver specific properties for color management on linux part 2 tl dr this blog post explores the color capabilities of amd hardware and how they are exposed to userspace through driver specific properties it discusses the different color blocks in the amd display core next dcn pipeline and their capabilities such as predefined transfer functions 1d and 3d lookup tables luts and color transformation matrices ctms it also highlights the differences in amd hw blocks for pre and post blending adjustments and how these differences are reflected in the available driver specific properties overall this blog post provides a comprehensive overview of the color capabilities of amd hardware and how they can be controlled 21 aug 2023 igalia amd driver specific properties for color management on linux part 1 tl dr color is a visual perception human eyes can detect a broader range of colors than any devices in the graphics chain since each device can generate capture or reproduce a specific subset of colors and tones color management controls color conversion and calibration across devices to ensure a more consistent color reproduction we can expose a gpu accelerated display color management pipeline to support this process and enhance results and this is what we are doing on linux to improve color management on gamescope steamdeck even with the challenges of being external developers we have been working on mapping amd gpu 10 nov 2022 igalia v3d enablement in mainline kernel hey if you enjoy using upstream linux kernel in your raspberry pi system or just want to give a try in the freshest kernel graphics drivers there the good news is that now you can compile and boot the v3d driver from the mainline in your raspberry pi 4 thanks to the work of stefan peter and nicolas 1 2 the v3d enablement reached the linux kernel mainline that means hacking and using new features available in the upstream v3d driver directly from the source however even for those used to compiling and installing a custom kernel in the raspberry 10 may 2022 igalia multiple syncobjs support for v3d v part 2 in the previous post i described how we enable multiple syncobjs capabilities in the v3d kernel driver now i will tell you what was changed on the userspace side where we reworked the v3dv sync mechanisms to use vulkan multiple wait and signal semaphores directly this change represents greater adherence to the vulkan submission framework i was not used to vulkan concepts and the v3dv driver fortunately i counted on the guidance of the igalia s graphics team mainly iago toral thanks to understand the vulkan graphics pipeline sync scopes and submission order therefore we changed the original v3dv implementation for 10 may 2022 igalia multiple syncobjs support for v3d v part 1 as you may already know we at igalia have been working on several improvements to the 3d rendering drivers of broadcom videocore gpu found in raspberry pi 4 devices one of our recent works focused on improving v3d v drivers adherence to vulkan submission and synchronization framework we had to cross various layers from the linux graphics stack to add support for multiple syncobjs to v3d v from the linux drm kernel to the vulkan driver we have delivered bug fixes a generic gate to extend job submission interfaces and a more direct sync mapping of the vulkan framework these changes did not 31 aug 2020 gsoc 2020 gsoc final report hi i haven t said hi for a while when starting a post i think the rush and the whirlwind of things happening during the gsoc made me a little agitated this year my project was the only one accepted for x org foundation and i felt a great responsibility well this is the last week of the project and i m slowing down and breathing this report is a summary of my journey at google summer of code 2020 experience and technical reports can be read in more detail in the 11 blog posts i published during this period date post 28 aug 2020 gsoc 2020 false positive for alpha blending i recently posted about a feature i developed for vkms to consider the alpha channel in the composition of the cursor plane with the primary plane this process took a little longer than expected and now i can identify a few reasons beginner i had little knowledge of computer graphics and its operations maybe cliché i did not consider that in the subsystem itself there was already material to aid coding the unexpected the test cases that checked the composition of a cursor considering the alpha channel were successful even with a defect in the implementation igt gpu tools has 27 aug 2020 gsoc 2020 another day another mistery as a newbie i consider debugging as a study guided during the process i have a goal that leads me to browse the code raise and down various suspicions look at the changes history and perhaps relate changes from other parts of the kernel to the current problem co debugging is even more interesting approaches are discussed we open our mind to more possibilities refine solutions and share knowledges in addition to preventing any uncomplete solution debugging the operation of vkms when composing plans was a very interesting journey all the shared ideas was so dynamic and open that at the 19 aug 2020 gsoc 2020 if a warning remains the job is not finished in the past few weeks i was examining two issues on vkms development of writeback support and alpha blending i try to keep activities in parallel so that one can recover me from any tiredness from the other p alpha blending is a todo 1 of the vkms that possibly could solve the warning 2 triggered in the cursor alpha transparent testcase and you know if you still have a warning you still have work blend blend value at vaddr_src with value at vaddr_dst todo use the alpha value to blend vaddr_src with vaddr_dst instead of overwriting it warning suspicious crc 13 aug 2020 gsoc 2020 the end of an endless debugging of an endless wait after a long debugging process we finally reached an acceptable solution to the problem of running sequential subtests of igt tests involving crc capture using the vkms despite all the time uncertainty and failures this was by far one of the greatest lessons learned in my journey of floss developer with this experience i learned a lot about how vkms works evolved technically experienced different feelings and interacted with people i may never meet in person these people were sharing some of their knowledge with me in open and accessible communication the interactions allowed us to build together a more 17 jul 2020 gsoc 2020 increasing test coverage in vkms max square cursor size in march i inspected the coverage of kms_cursor_crc on vkms to develop my gsoc project proposal using piglit i present the evolution of this coverage so far result gsoc start only accepted patches fixes under development pass 7 22 24 warn 1 0 1 fail 2 3 0 skip 236 221 221 crash 0 0 0 timeout 0 0 0 incomplete 0 0 0 dmesg warn 0 0 0 dmesg fail 0 0 0 changes 0 0 0 fixes 0 0 0 regressions 0 0 0 total 246 246 246 instability in the sequential run of subtests ie although the statistic 6 jul 2020 gsoc 2020 gsoc first phase achievements the first round just passed so fast and what i did the case the igt test kms_cursor_crc being acquainted with a igt test anatomy of the test what study read the code dive into each function and describe its structure steps and functionality to be well aware of the code construction and consequently able to figure out and deal with problems patches to improve test documentation what during the study of the kms_cursor_crc test i realized that the subtests had no description that would help a newcomer to perceive the purpose of that subtest to improve this documentation and some 15 jun 2020 gsoc 2020 status update connected errors i spent the last week investigating the cause of two problems between vkms and igt that i have faced and reported in the development phase of my gsoc project proposal one of the issues was a weird behavior that i described as unstable in the sequential execution of the kms _cursor _crc subtests or running the same subtest twice in a row a subtest that passed in the first run failed in the second and returned to succeed in the third and so on at first it was difficult to determine where was the error because i had a very 3 jun 2020 gsoc 2020 walking in the kms cursor crc test in this post i describe the steps involved in the execution of a kms_cursor_crc subtest in my approach i chose a subtest pipe a cursor alpha transparent as a target and examined the code from the beginning of the test igt main until reaching the target subtest and executing it this is my zero version i plan to incrementally expand this document with evaluation description of the other subtests i will probably also need to fix some misunderstandings as described by igt kms_cursor_crc uses the display crc support to validate cursor plane functionality the test will position the cursor plane either fully onscreen partially onscreen 2 jun 2020 gsoc 2020 status update tie up loose ends before starting as the gsoc coding time officially started this week 01 06 2020 this post is a line between my activities in the period of community bonding and the official development of my project i used the last month to solve issues in my development environment improve the tool that supports my development activity kworflow and study concepts and implementations related to my gsoc project communication besides e mail irc chat and telegram my mentor siqueira and i are meeting every wednesday on jitsi where we also use tmate for terminal sharing we also use together with trevor a spreadsheet to schedule tasks report 20 may 2020 gsoc 2020 everyone makes a script meanwhile in gsoc i took the second week of community bonding to make some improvements in my development environment as i have reported before i use a qemu vm to develop kernel contributions i was initially using an arch vm for development however at the beginning of the year i reconfigured it to use a debian vm since my host is a debian installation fewer context changes in this movement some ends were loose and i did some workarounds well better round it off i also use kworkflow kw to ease most of the no coding tasks included in the 13 may 2020 gsoc 2020 i m in gsoc 2020 x org foundation i submitted a project proposal to participate in this year s google summer of code gsoc as i am curious about the drm subsystem and have already started to work in contributing to it i was looking for an organization that supports this subsystem so i applied to the x org foundation and proposed a project to improve vkms using igt gpu tools luckily in may 4th i received a e mail from gsoc announcing that i was accepted happy happy happy observing a conversation in dri devel channel i realized tha...