[Nouveau] Blank Screen on Mac Book Retina

[Ilia Mirkin]

Didn't you send this same email yesterday? As you point out yourself,
your bisect result is bogus. If you no longer have access to the
machine, this will have to wait until someone else with the issue is
able to debug it.

On Sun, Apr 5, 2015 at 9:22 AM, Harald Jung <jung at hjit.de> wrote:
> 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
>
> Here is the bisect log:
> Bisecting: a merge base must be tested
> [1860e379875dfe7271c649058aeddffe5afd9d0d] Linux 3.15
> Bisecting: 6940 revisions left to test after this (roughly 13 steps)
> [7b215de3d0abbc4f6daf2efd19e8809af0564490] Merge branch 'i2c/for-next' of
> git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux into next
> 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: 189 revisions left to test after this (roughly 8 steps)
> [aeab0b5af7df88284d101abf8d121f0e913b81ff] drm/i915: disable runtime PM if
> RC6 is disabled
> Bisecting: 94 revisions left to test after this (roughly 7 steps)
> [9d0a6fa6c5e618bd978d625a215dc4a240ba3b3c] drm/i915: add render state
> initialization
> Bisecting: 47 revisions left to test after this (roughly 6 steps)
> [b3a3f03d7b1cfecf055e35289371f42a401fdd94] drm/i915: Fix ILK GPU reset
> domain bits
> Bisecting: 23 revisions left to test after this (roughly 5 steps)
> [c0c353299c48b19c95de1e7bda494c0c71248c0c] drm/i915/chv: Fix gmbus for port
> D
> Bisecting: 11 revisions left to test after this (roughly 4 steps)
> [1966e59ec1075597eff4d7feb3d11536a242d0eb] drm/i915/chv: Use RMW to toggle
> swing calc init
> Bisecting: 5 revisions left to test after this (roughly 3 steps)
> [525997e00bd32c3e25d5f77c26703f76c498f424] drm/i915: shuffle panel code
> Bisecting: 2 revisions left to test after this (roughly 2 steps)
> [75f7f3ec600524c9544cc31695155f1a9ddbe1d9] drm/i915: Fix mmio vs. CS flip
> race on ILK+
> Bisecting: 0 revisions left to test after this (roughly 1 step)
> [6304cd91e7f05f8802ea6f91287cac09741d9c46] drm/i915: Drop the excessive
> vblank waits from modeset codepaths
> 4fa62c890cea83f28c30e1d5dc8fc86f61210280 is the first bad commit
> commit 4fa62c890cea83f28c30e1d5dc8fc86f61210280
> Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Date:   Tue Apr 15 21:41:38 2014 +0300
>
>     drm/i915: Move buffer pinning and ring selection to
> intel_crtc_page_flip()
>
>     All of the .queue_flip() callbacks duplicate the same code to pin the
>     buffers and calculate the gtt_offset. Move that code to
>     intel_crtc_page_flip(). In order to do that we must also move the ring
>     selection logic there.
>
>     Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
>     Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
>     Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
>
> :040000 040000 829ebf0fa1e7b31c1623aa498efc92bca429a483
> 511140874cd4759c4eadef87ee9968808efa5f2a M      drivers
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