Sorry, missed to send this to the devel list. ---------- Forwarded message ---------- From: Andreas Tunek <andreas.tunek@xxxxxxxxx> Date: 2015-10-05 19:57 GMT+02:00 Subject: Re: 5K iMac retina multi stream display port To: Dave Airlie <airlied@xxxxxxxxx> 2015-10-05 12:06 GMT+02:00 Dave Airlie <airlied@xxxxxxxxx>: > On 4 October 2015 at 21:36, Andreas Tunek <andreas.tunek@xxxxxxxxx> wrote: >> 2015-10-04 13:31 GMT+02:00 Andreas Tunek <andreas.tunek@xxxxxxxxx>: >>> 2015-10-04 13:26 GMT+02:00 Andreas Tunek <andreas.tunek@xxxxxxxxx>: >>>> 2015-10-04 6:31 GMT+02:00 Dave Airlie <airlied@xxxxxxxxx>: >>>>> On 3 October 2015 at 04:03, Andreas Tunek <andreas.tunek@xxxxxxxxx> wrote: >>>>>> Hi >>>>>> >>>>>> I sort of recall that somebody (Dave Airlied) work on this in order to >>>>>> get the full 5K from a retina iMac. Was that work finished or is that >>>>>> coming in 4.3 or later? Or was it abandoned? Or maybe I am not >>>>>> remembering correctly? >>>>> >>>>> you can try a 4.2 kernel with radeon.mst=1 >>>>> >>>>> I've no idea if it will work. >>>> >>>> Didn't seem to have any effect. Is this a correct boot env: >>>> [ >>>> root@iMacLinux tuna]# cat /proc/cmdline >>>> BOOT_IMAGE=/vmlinuz-4.2.1-300.fc23.x86_64 >>>> root=UUID=e3e65337-b654-495f-b7c1-0212e1fd0797 ro rhgb quiet >>>> LANG=en_US.UTF-8 radeon.mst=1 >>>> >>>>> >>>>> Dave. >>> >>> Sorry for replying again, but you wrote some stuff in February*, did >>> you test with an iMac or some other 5K screen then? >>> >>> http://thread.gmane.org/gmane.comp.video.dri.devel/124345 >>> >>> Best regards >>> Andreas > > No I never tested anything on an imac 5K. > > Can you boot with drm.debug=6 radeon.mst=1 and post the > dmesg logfile? > > I'm not sure if the 5K mode on these would need to be reverse engineered > there is definitely some trickery involved. > > Dave. See attached file. cat /proc/cmdline BOOT_IMAGE=/vmlinuz-4.2.1-300.fc23.x86_64 root=UUID=e3e65337-b654-495f-b7c1-0212e1fd0797 ro rhgb quiet LANG=en_US.UTF-8 drm.debug=6 radeon.mst=1
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