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There was a thread on dri-devel a year ago: https://lists.freedesktop.org/archives/dri-devel/2015-October/093294.html https://lists.freedesktop.org/archives/dr
by l1k 10y ago
There was a thread on dri-devel a year ago:
https://lists.freedesktop.org/archives/dri-devel/2015-October/093294.html https://lists.freedesktop.org/archives/dri-devel/2015-Octobe...
Back then the probed panel resolution (EDID retrieved by radeon) was 3840x2160, which doesn't make any sense because the panel actually has 5120x2880. It's unclear if this was because of missing/broken MST support in radeon (Multistream Transport) or if Apple used some proprietary mechanism to squeeze the panel resolution in a single stream transport. You may want to contact the person who started that thread (Andreas Tunek) and ask if the situation has improved with contemporary kernels.
- JoelTheSuperior 10y agoIf memory serves Apple didn't actually use MST for the 5k iMac and instead developed a custom timing controller which allowed them to get the 5k resolution working over a single stream. It's the same reason why, for example, Windows sees it as a 3840x2160 panel as well.
- gurkendoktor 10y agoOh, I wasn't aware that Windows was affected too. Apparently it took Apple some time to bring 5K support to Boot Camp for 2014 iMac model [1]. I guess I'll wait for Apple to actually announce new desktops before I seriously look into the driver situation... [1] http://forums.macrumors.com/threads/bootcamp-update-5k-windows-on-all-5k-imacs.1939481/ http://forums.macrumors.com/threads/bootcamp-update-5k-windo...