Hello, I am developing a video playback application on the Solidrun HummingBoard Pulse (i.MX8M Plus) and have built a Yocto image following the meta-solidrun-arm-imx8 GitHub repository. I am using Weston as the compositor and have added fullscreen-shell.so to my build. I configure my monitor’s reso…

Thanks for looking into this! I just wanted to follow up to see if you made any progress with getting 59.9Hz to work. To include fullscreen-shell.so in my Yocto build, I added this to local.conf: PACKAGECONFIG:append:pn-weston = " shell-fullscreen" Then I built the image with: bitbake imx-image-…

This appears to be a BSP limitation, not a hardware limitation. I am still debugging the full stack to figure out where the failure is.

This is an ongoing clock configuration issue. It is being discussed in mainline kernel mailing list. Re: [PATCH 1/2] clk: imx: clk-imx8mp: Allow LDB serializer clock reconfigure parent rate - Liu Ying

Thanks for looking into this for me, I’ve had a look at the link you sent, and it seems that this problem is known but unresolved. So it seems at present the imx8mp is unable to play at 59.9Hz, I am wondering do you have any workarounds for achieving this in the meantime (whilst the issue is being …

well it is resolved, but requires a mainline patchset and custom device-tree changes. Can I ask is there a specific reason you need 59.9Hz rather than 60Hz? Just because 59.9Hz is kind of a legacy hold over from CRT displays.

Thanks for clarifying, do you think adding this patch is something you be able to assist in? Regarding the use case for 59.9 or more precisely 59.94Hz. All US professional broadcast systems, and the associated cameras used for sports and Broadcast studios, use 59.94Hz as the precise frame rate. Som…

Very interesting and fair enough. Do you only need 59.94 support? If I can provide a fixed clock rate that supports this signal is that enough, or does it need to by dynamic for other output refresh rates?

It will need to be dynamic, the HDMI output is being fed into an HD SDI converter that supports the following refresh rates: Video standard 1080p 60Hz 59.94Hz 50Hz 30Hz 29.97Hz 25Hz 24Hz 23.98Hz 1080i 60Hz 59.94Hz 50Hz 720p 60Hz 59.94Hz 50Hz

Issue Setting 59.9Hz Refresh Rate on Solidrun HummingBoard Pulse (i.MX8M Plus) with Weston

NXP i.MX8M Plus

jnettlet February 5, 2025, 11:17am 2

This should be a supported refresh rate. I will test locally and get back with my findings.

1 Like

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Issue Setting 59.9Hz Refresh Rate on Solidrun HummingBoard Pulse (i.MX8M Plus) with Weston

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