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OESF Portables Forum _ Gemini PDA - Linux _ HDMI output with linux

Posted by: ixido Feb 11 2019, 08:32 AM

Has anyone here managed to get HDMI output working on Linux?

I am using the original Gemini USB-c to HDMI adapter. I successfully get a mirrored screen in android, but with the stock debian install I get nothing - the display isn't recognized.

Posted by: Eric BF Feb 11 2019, 08:41 AM

Cannot help you except to reassure you that you are not alone in this: I have not managed to have my Gemini recognised by any HDMI device I have tried. Annoying because using my Gemini to give presentations was one of my key use cases. I only use Debian.

Posted by: mithrandir Feb 11 2019, 11:15 AM

QUOTE(ixido @ Feb 11 2019, 08:32 AM) *
Has anyone here managed to get HDMI output working on Linux?

I am using the original Gemini USB-c to HDMI adapter. I successfully get a mirrored screen in android, but with the stock debian install I get nothing - the display isn't recognized.


I think, currently this is not possible. Probably some changes to hwcomposer are required to get this to work. Maybe NotKit can enlighten us if this is true.

Posted by: TheKit Feb 11 2019, 12:28 PM

QUOTE(mithrandir @ Feb 11 2019, 10:15 PM) *
I think, currently this is not possible. Probably some changes to hwcomposer are required to get this to work. Maybe NotKit can enlighten us if this is true.

Yeah, that's problematic as current xf86-video-hwcomposer driver is built around assuming single screen. I had been able to get test_hwcomposer from libhybris to render on two screens (see https://paste.ubuntu.com/p/nMd8R6Krxh/ + https://paste.ubuntu.com/p/J9SQWNMVBB/ to enable HDMI on Gemini PDA in particular), but that is not integrated in driver. If anyone wants to help, I can explain on IRC what could be done.

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