[Bug 67950] [ivb regression][bisect] 3.10: i915 blanks eDP panel (backlight set to 0 and further ineffective)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67950

Michael Shigorin <mike at altlinux.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[ivb regression] 3.10: i915 |[ivb regression][bisect]
                   |blanks eDP panel (backlight |3.10: i915 blanks eDP panel
                   |set to 0 and further        |(backlight set to 0 and
                   |ineffective)                |further ineffective)

--- Comment #4 from Michael Shigorin <mike at altlinux.org> ---
(In reply to comment #1)
> I have the same machine and it seems to still work here. So no idea what's
> gone boink.
Do you run it in BIOS or UEFI mode?
efifb gets initialized first here as mentioned in dmesg attached.

> Can you please try to bisect this regression?
Yup (thanks boyarsh at altlinux); git bisect log:
# bad: [8bb495e3f02401ee6f76d1b1d77f3ac9f079e376] Linux 3.10
# good: [c1be5a5b1b355d40e6cf79cc979eb66dafa24ad1] Linux 3.9
git bisect start 'v3.10' 'v3.9' '--' 'drivers/gpu/drm/i915/'
# bad: [8a5c2ae753c588bcb2a4e38d1c6a39865dbf1ff3] drm/i915: fix ILK GPU reset
for render
git bisect bad 8a5c2ae753c588bcb2a4e38d1c6a39865dbf1ff3
# good: [ed5de3995f9cdff997613f240e41033463703121] drm/i915: add media well to
VLV force wake routines v2
git bisect good ed5de3995f9cdff997613f240e41033463703121
# good: [fa00abe00e379a0e9b070616baee58692576f29e] DRM/i915: Remove
valleyview_hpd_irq_setup.
git bisect good fa00abe00e379a0e9b070616baee58692576f29e
# good: [460da91617d870972a7ae300fad3e13731b67757] drm/i915: compute
pipe_config earlier
git bisect good 460da91617d870972a7ae300fad3e13731b67757
# bad: [3600836585e3fdef0a1410d63fe5ce4015007aac] drm/i915: convert DP
autodither code to new infrastructure  
git bisect bad 3600836585e3fdef0a1410d63fe5ce4015007aac
# good: [5bfe2ac00395ca37219b7187299cd9d23ae06682] drm/i915: add
pipe_config->has_pch_encoder
git bisect good 5bfe2ac00395ca37219b7187299cd9d23ae06682
# good: [965e0c489f360df1beeb567e4540777a09b8896e] drm/i915: introduce
pipe_config->dither|pipe_bpp
git bisect good 965e0c489f360df1beeb567e4540777a09b8896e
# good: [4e53c2e010e531b4a014692199e978482d471c7e] drm/i915: precompute pipe
bpp before touching the hw
git bisect good 4e53c2e010e531b4a014692199e978482d471c7e
# first bad commit: [3600836585e3fdef0a1410d63fe5ce4015007aac] drm/i915:
convert DP autodither code to new
infrastructure

Seems that there's no image (kas@ advised to shine a flashlight upon the
display, there were no signs of display manager upon boot when the network was
up already).

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