Fwd: 5K iMac retina multi stream display port

[Andreas Tunek]

Sorry, missed to send this to the devel list.


---------- Forwarded message ----------
From: Andreas Tunek <andreas.tunek at gmail.com>
Date: 2015-10-05 19:57 GMT+02:00
Subject: Re: 5K iMac retina multi stream display port
To: Dave Airlie <airlied at gmail.com>


2015-10-05 12:06 GMT+02:00 Dave Airlie <airlied at gmail.com>:
> On 4 October 2015 at 21:36, Andreas Tunek <andreas.tunek at gmail.com> wrote:
>> 2015-10-04 13:31 GMT+02:00 Andreas Tunek <andreas.tunek at gmail.com>:
>>> 2015-10-04 13:26 GMT+02:00 Andreas Tunek <andreas.tunek at gmail.com>:
>>>> 2015-10-04 6:31 GMT+02:00 Dave Airlie <airlied at gmail.com>:
>>>>> On 3 October 2015 at 04:03, Andreas Tunek <andreas.tunek at gmail.com> 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 at 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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