[Nouveau] Blank Screen on Mac Book Retina

[Harald Jung]

Hi,

I did someId  bisect tests again, and the display is flickering or kind 
of broken since my test with 3.15.0-rc8-00812-g4874322.
The display doesn't work properly booted with OSX, too.
I'm afraid I'll have some trouble now.


Anyway, here is the new result:

4874322e78d505d38c8d4481118af5c9f0e8306d is the first bad commit
commit 4874322e78d505d38c8d4481118af5c9f0e8306d
Author: Ben Skeggs <bskeggs at redhat.com>
Date:   Sat May 31 01:48:06 2014 +1000

     drm/nouveau/dp: fix support for dpms

     SOR_PWR has no effect to power-off DP links, unlike other SOR 
protocols.

     Instead, on the source side, we cut power to the lanes after having put
     the sink into D3.  Link training takes care of everything required to
     bring it back again.

     Signed-off-by: Ben Skeggs <bskeggs at redhat.com>

:040000 040000 dc4448e7295cba363c38784e899da7238f5a592f 
d6dd6cb94f2c62ec0a7ffeeebe25e437ca296e37 M      drivers


3.15.0-rc8-06897-g7b215de good
3.15.0-09937-g0430e49 bad (blank)
3.15.0-08369-g2937f5e good
3.15.0-rc8-00847-gbc1dfff bad (blank)
3.15.0-rc3-00461-g4fa62c8 good
3.15.0-rc3-00666-gb33a51e good
3.15.0-rc8-00751-g5330fb4 good
3.15.0-rc8-00799-g7a014a8 good
3.15.0-rc8-00803-gc1a6e9f good
3.15.0-rc8-00810-gebd6acb good
3.15.0-rc8-00815-gc33ba68 bad (Artifacts flickering)
3.15.0-rc8-00812-g4874322 bad (Artifacts flickering)
3.15.0-rc8-00811-g8894f49 good

Bisecting: a merge base must be tested
[1860e379875dfe7271c649058aeddffe5afd9d0d] Linux 3.15
Bisecting: 3892 revisions left to test after this (roughly 12 steps)
[0430e49b6e7c6b5e076be8fefdee089958c9adad] ima: introduce ima_kernel_read()
Bisecting: 1567 revisions left to test after this (roughly 11 steps)
[2937f5efa5754754daf46de745f67350f7f06ec2] Merge branch 'for_linus' of 
git://cavan.codon.org.uk/platform-drivers-x86
Bisecting: 785 revisions left to test after this (roughly 10 steps)
[bc1dfff04a5d4064ba0db1fab13f84ab4f333d2b] Merge branch 
'drm-nouveau-next' of 
git://anongit.freedesktop.org/git/nouveau/linux-2.6 into drm-next
Bisecting: 402 revisions left to test after this (roughly 9 steps)
[4fa62c890cea83f28c30e1d5dc8fc86f61210280] drm/i915: Move buffer pinning 
and ring selection to intel_crtc_page_flip()
Bisecting: 197 revisions left to test after this (roughly 8 steps)
[b33a51e457b7e01e3e25eaa7c99aec32e65c00de] Merge branch 
'exynos-drm-next' of 
git://git.kernel.org/pub/scm/linux/kernel/git/daeinki/drm-exynos into 
drm-next
Bisecting: 95 revisions left to test after this (roughly 7 steps)
[5330fb412948420be83d1d247b79d8108408efe6] Merge tag 
'drm/panel/for-3.16-rc1' of git://anongit.freedesktop.org/tegra/linux 
into drm-next
Bisecting: 47 revisions left to test after this (roughly 6 steps)
[7a014a872914a6bb5af8b67eba603f8546794ab9] drm/nouveau/disp: add 
internal representaion of output paths and connectors
Bisecting: 21 revisions left to test after this (roughly 5 steps)
[c1a6e9fe82b46159af8cc4cf34fb51ee47862f05] Merge branch 
'topic/ipu-destaging' of git://git.pengutronix.de/git/pza/linux into 
drm-next
Bisecting: 10 revisions left to test after this (roughly 4 steps)
[ebd6acbb068b6558735eb80aabce1e7af9e78e1e] drm/g94-/disp: add method to 
power-off dp lanes
Bisecting: 5 revisions left to test after this (roughly 3 steps)
[c33ba689e54d91bac52a6f7a86d06699c9a8e7c3] drm/nouveau/disp/dp: make use 
of postcursor when its available
Bisecting: 2 revisions left to test after this (roughly 1 step)
[4874322e78d505d38c8d4481118af5c9f0e8306d] drm/nouveau/dp: fix support 
for dpms
Bisecting: 0 revisions left to test after this (roughly 0 steps)
[8894f4919bc43f821775db2cfff4b917871b2102] drm/nouveau: register a 
drm_dp_aux channel for each dp connector
4874322e78d505d38c8d4481118af5c9f0e8306d is the first bad commit
commit 4874322e78d505d38c8d4481118af5c9f0e8306d
Author: Ben Skeggs <bskeggs at redhat.com>
Date:   Sat May 31 01:48:06 2014 +1000

     drm/nouveau/dp: fix support for dpms

     SOR_PWR has no effect to power-off DP links, unlike other SOR 
protocols.

     Instead, on the source side, we cut power to the lanes after having put
     the sink into D3.  Link training takes care of everything required to
     bring it back again.

     Signed-off-by: Ben Skeggs <bskeggs at redhat.com>

:040000 040000 dc4448e7295cba363c38784e899da7238f5a592f 
d6dd6cb94f2c62ec0a7ffeeebe25e437ca296e37 M      drivers



regards Harald


> Hi,
>
> we have a blank screen on a mac book retina since kernel 3.16.
> The behavour is a bit weird:
> In kernel 3.16 and higher it is like this, when you reset all display 
> and xrandr settings, sometimes the screen comes up in the highest 
> possible resolution.
> But when you try to choose another resolution the screen stays turns 
> black.
> But in 80% of the tries it stays black, when the saved screen 
> resolutions is another than the highest resolution it always stays black.
>
> As imirkin mentioned on irc, the problem is caused by the "nouveau 
> E[   PDISP][0000:01:00.0] 00:0006:0f44: link training failed ".
> The last working kernel was 3.15.10.
>
> I've tried to bisect it, but i wasn't able to have the notebook for 
> the whole time.
> And so we tried to do the rest of the bisects remote, but i think 
> we've messed something up in the coordination
> I have no chance to try a bisect again (not when i start with 3.15.10 
> good and 3.16 bad), it takes to much time and i don't have access to 
> the notebook for so long.
> If we really need a bisect, maybe you could help me with a better 
> starting and ending version to try
>
> Logfiles and stuff can be found at the end of the mail.
>
> best regards
> Harald
>
> Hardware Info can be found at: http://www.hjit.de/macretina.txt
>