Post 9xcTlXAtxBU7ctUIPg by amosbatto@social.librem.one
(DIR) More posts by amosbatto@social.librem.one
(DIR) Post #9xcFc5l37ZgQd5zzrk by agx@social.librem.one
2020-07-30T14:37:17Z
0 likes, 5 repeats
@purism Glimpse of a #librem5 driving an external screen via usb-c's #dp-alt-mode:
(DIR) Post #9xcK8vGFZIx7RnVGFc by johnhamelink@mastodon.scot
2020-07-30T16:31:03Z
0 likes, 1 repeats
@agx @purism can't wait to get my hands on this :)
(DIR) Post #9xcTlXAtxBU7ctUIPg by amosbatto@social.librem.one
2020-07-30T18:17:03Z
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Awesome to see DisplayPort Alt Mode mode working and in 3D! I noticed that the i.MX 8M Quad documentation shows a DRM blob for using HDMI, so I was wondering if you found a way around that using DCSS or will we be limiited to DisplayPort Alt Mode?
(DIR) Post #9xcTlXQqzsFGQMx2HI by dos@social.librem.one
2020-07-30T18:18:58Z
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@amosbatto DisplayPort alt-mode is in fact how most USB-C to HDMI adapters work. HDMI alt-mode, although it exists, is rather rare and not supported that well across various hardware.
(DIR) Post #9xcc1ekWMIrjNvLZZo by amosbatto@social.librem.one
2020-07-30T19:51:33Z
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@dos, OK, that makes sense, but if DisplayPort Alt Mode is carrying an HDMI signal, we still have the same question for RYF certification. Does the DCSS driver for the iMX8MQ no longer require the HDMI DRM blob or is the video being converted to HDMI outside the iMX8MQ?
(DIR) Post #9xcg6D593J4YqBQ8bA by dos@social.librem.one
2020-07-30T20:37:12Z
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@amosbatto DisplayPort alt-mode is carrying a DisplayPort signal, not HDMI. It's usually the adapter that converts it to HDMI.
(DIR) Post #9xcl5iKXsy9xElCtCi by amosbatto@social.librem.one
2020-07-30T21:33:08Z
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@dos, Oh I assumed that DP alt-mode was like normal DP, but I Googled it and found that there is no DP Dual Mode (DP++) over DP alt-mode, so it isn't possible to send an HDMI signal over DP alt-mode. We will need an active adapter to convert from DP to HDMI. This article explains it:https://www.barco.com/en/news/displayport-to-hdmi-conversion-should-i-use-an-active-or-passive-adapter
(DIR) Post #9xd04MolsizNXYA0rw by dos@social.librem.one
2020-07-31T00:20:58Z
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@amosbatto Yes, I know, and I said that earlier - most USB-C to HDMI adapters use DP alt-mode, which is universally supported, and not HDMI alt-mode, which is rather rare and can't be used together with USB signal at the same time.
(DIR) Post #9xf24dH5HhsAnuZt1U by amosbatto@social.librem.one
2020-07-31T23:52:51Z
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@dos, HDMI alt-mode not being common gives me hope for the future. As more devices move to USB-C, we can get rid of HDMI, which requires licensing fees, and just DisplayPort, which is a freer standard. Nice to find something positive in this dreary world.
(DIR) Post #9xf299laQEdujb0CRM by amosbatto@social.librem.one
2020-07-31T23:53:40Z
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@dos, HDMI alt-mode not being common gives me hope for the future. As more devices move to USB-C, we can get rid of HDMI, which requires licensing fees, and just use DisplayPort, which is a freer standard. Nice to find something positive in this dreary world.
(DIR) Post #9yxFBnN1Es6RYQFsdE by agx@social.librem.one
2020-09-08T16:32:04Z
0 likes, 1 repeats
@purism And here's the #librem5 connected to a usb-c hub that has a keyboard/mouse connected via usb and driving the external screen via dp-alt-mode. Needs some hacks still but we're getting there:
(DIR) Post #9yzDeLZNruHA8cRfii by agx@social.librem.one
2020-09-09T15:27:54Z
0 likes, 4 repeats
@purism …and here's a quick Quake II demo using the #librem5 docked via usb-c (audio is from L5's built in speaker) - might be a bit more exciting than running #libreoffice (which also works):