[Bug 90320] Lenovo ThinkPad E455 (Kaveri A10-7300): Blank built-in screen with radeon kms driver

[Bug 90320] Lenovo ThinkPad E455 (Kaveri A10-7300): Blank built-in screen with radeon kms driver

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

            Bug ID: 90320
           Summary: Lenovo ThinkPad E455 (Kaveri A10-7300): Blank built-in
                    screen with radeon kms driver
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: blocker
          Priority: highest
         Component: DRM/Radeon
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: sibradzic@gmail.com

Created attachment 115550
  --> https://bugs.freedesktop.org/attachment.cgi?id=115550&action=edit
dmesg 4.1 rc1

As soon as the radeon kms switches in from efifb, the screen goes blank for the
moment (no backlight), and then the backlight switches in, but the screen
remains black. External HDMI output works just fine. No X is involved, I can't
even see the kms console @ eDP. I can even control the backlight on the eDP
display, but all i get is the various shades of black. Fglrx works fine,
although it flickers wildly before the picture gets stable.

I've tried numerous things, like forcing EDID that was grabbed from fglrx,
disabling audio, applying all the DP training / backlight disabling patches as
in https://bugs.freedesktop.org/show_bug.cgi?id=73530, all to no avail.
Currently on linux 4.1rc1, tried 3.13, 3.16 & 3.19 as well, same issue.

Please help! I bought this laptop cause I prefer AMD, and was expecting Lenovo
to work great with Linux, but so far its broken. Ready to try some patches...

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[Bug 90320] Lenovo ThinkPad E455 (Kaveri A10-7300): Blank built-in screen with radeon kms driver

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #1 from Alex Deucher <alexdeucher@gmail.com> ---
Please attach your xorg log as well.

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[Bug 90320] Lenovo ThinkPad E455 (Kaveri A10-7300): Blank built-in screen with radeon kms driver

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #2 from Samir Ibradžić <sibradzic@gmail.com> ---
Created attachment 115570
  --> https://bugs.freedesktop.org/attachment.cgi?id=115570&action=edit
Xorg.0.log radeon kms

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[Bug 90320] Lenovo ThinkPad E455 (Kaveri A10-7300): Blank built-in screen with radeon kms driver

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #3 from Samir Ibradžić <sibradzic@gmail.com> ---
Created attachment 115571
  --> https://bugs.freedesktop.org/attachment.cgi?id=115571&action=edit
Xorg.0.log fglrx

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[Bug 90320] Lenovo ThinkPad E455 (Kaveri A10-7300): Blank built-in screen with radeon kms driver

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #4 from Samir Ibradžić <sibradzic@gmail.com> ---
Attached xorg logs, both for radeon kms & fglrx. Anyone knows if fglrx has some
kind of debug log where DP link training bits may be visible?

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[Bug 90320] Lenovo ThinkPad E455 (Kaveri A10-7300): Blank built-in screen with radeon kms driver

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #5 from Samir Ibradžić <sibradzic@gmail.com> ---
Created attachment 115573
  --> https://bugs.freedesktop.org/attachment.cgi?id=115573&action=edit
dmesg with drm.debug=15

Attached dmesg with drm.debug=15, is shows seemingly correct eDP link training

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #6 from Samir Ibradžić <sibradzic@gmail.com> ---
Any news new, or at least some suggestion what code to look into?

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #7 from Nicolas Werner <nicolas.werner@ymail.com> ---
N.Leiten seems to have found something, while looking into
https://bugs.freedesktop.org/show_bug.cgi?id=73530 .
As your problem seems to be rather similar, once there is a patch, the fix will
hopefully also apply to you.
Also there is some more information about what he found, maybe this can help
you?

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[Bug 90320] Lenovo ThinkPad E455 (Kaveri A10-7300): Blank built-in screen with radeon kms driver

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

N.Leiten <nickleiten@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nickleiten@gmail.com

--- Comment #8 from N.Leiten <nickleiten@gmail.com> ---
Created attachment 115731
  --> https://bugs.freedesktop.org/attachment.cgi?id=115731&action=edit
FHD Panel Datasheet.

Due this datasheet the panel looks the same as for DP configuration comparing
whith N133HSE-EA1 (asus u38n) panel. So it needs 2 lanes to init video stream.

As for your dmesg, I see problem in dp_aux_ch and training procedure (the
voltage and emphasis is 0 which is not right at this point). Need to debug
further when I publish my patch and if it not help.

One more thing, do you have FullHD (1920x1080) panel or WHD (1366x768) one.
Because on Lenovo site I see Thinkpad e455 base model with WHD. The last one
need only 1 DisplayPort lane to work.

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[Bug 90320] Lenovo ThinkPad E455 (Kaveri A10-7300): Blank built-in screen with radeon kms driver

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #9 from Samir Ibradžić <sibradzic@gmail.com> ---
Created attachment 115742
  --> https://bugs.freedesktop.org/attachment.cgi?id=115742&action=edit
HB140FH1-401 datasheet

Finally got my hands on some p-coins (damn the neo-capitalist China!) and
fetched the datasheet for my panel (or at least what i think i have inside my
E455 according to EDID, but it seems right as several other Lenovo laptops
comes with the same thing included). The timings looks the same as U38N, it is
definitely 2 2.7Gbps lanes, but I can't claim i understand much besides that
inside the datasheet. Yes, the panel is is full HD 1920x1080, here in Lenovo
Japan it is available as an +$20 option, which was the main reason I bought
this particular machine (besides the fact its AMD APU of course).

I can help debugging any patches or code hacks, so if you have any ideas,
onegaishimasu.

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #10 from Samir Ibradžić <sibradzic@gmail.com> ---
(In reply to N.Leiten from comment #8)
> Created attachment 115731 [details]
> FHD Panel Datasheet.
> 
> Due this datasheet the panel looks the same as for DP configuration
> comparing whith N133HSE-EA1 (asus u38n) panel. So it needs 2 lanes to init
> video stream.
> 
> As for your dmesg, I see problem in dp_aux_ch and training procedure (the
> voltage and emphasis is 0 which is not right at this point). Need to debug
> further when I publish my patch and if it not help.
> 
> One more thing, do you have FullHD (1920x1080) panel or WHD (1366x768) one.
> Because on Lenovo site I see Thinkpad e455 base model with WHD. The last one
> need only 1 DisplayPort lane to work.

Are you saying these may be an issue:

[drm:radeon_dp_aux_transfer_native] dp_aux_ch flags not zero: 00000201
[drm:drm_dp_i2c_do_msg] transaction failed: -5

?

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #11 from Alex Deucher <alexdeucher@gmail.com> ---
Created attachment 115885
  --> https://bugs.freedesktop.org/attachment.cgi?id=115885&action=edit
possible fix

Does this patch help?

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #12 from Samir Ibradžić <sibradzic@gmail.com> ---
(In reply to Alex Deucher from comment #11)
> Created attachment 115885 [details] [review]
> possible fix
> 
> Does this patch help?

Unfortunately no, same symptoms.

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #13 from Samir Ibradžić <sibradzic@gmail.com> ---
bump. Anything else I can try?

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

Samir Ibradžić <sibradzic@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|DRI git                     |unspecified
          Component|DRM/Radeon                  |DRM/AMDgpu-pro

--- Comment #14 from Samir Ibradžić <sibradzic@gmail.com> ---
A year and a half later, BUMP again

- This bug is still happening on upstream kernels, just tried against 4.9 rc5
- It happens on latest amdgpu, with CIK support compiled
- It even happens with amdgpu-pro DKMS 16.40.5 @ Ubuntu 16.04 @ 4.4.0-47.68
which supposedly enables DAL (it doesn't want to compile on newer kernels)

The same implications as before, eDP is black, backlight control works,
external HDMI works.

It only works with fglrx, just checked with 15.20.2 (Feb 27 2015 build) @
Ubuntu 15.04 @ 4.0.0-040000-generic (ubuntu ppa kernel), display inits fine, X
works, but Gnome just dies on it, so I'm forced to use desktop that I can't
stand...

Whay would fglrx know how to enable eDP, when all other fail? Is there some
dark display initialization voodoo magic in there that is not in amdgpu-pro
DAL? Some sort of workaround in the code dedicated to handle some buggy eDP
link training or i2c link issues that are known for some LCD displays?

Please Help

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #15 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Samir Ibradžić from comment #14)
> 
> Whay would fglrx know how to enable eDP, when all other fail? Is there some
> dark display initialization voodoo magic in there that is not in amdgpu-pro
> DAL? Some sort of workaround in the code dedicated to handle some buggy eDP
> link training or i2c link issues that are known for some LCD displays?

DAL is not currently enabled for Kaveri.

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|DRM/AMDgpu-pro              |DRM/Radeon

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #16 from Samir Ibradžić <sibradzic@gmail.com> ---
Is there are way to enable it in the code provided by 16.40 DKMS package?

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #17 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Samir Ibradžić from comment #16)
> Is there are way to enable it in the code provided by 16.40 DKMS package?

Not at the moment.

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--- Comment #18 from Samir Ibradžić <sibradzic@gmail.com> ---
OK, how about pointing me to the bugged eDP workaround code in the latest
public  DAL code tree?

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

--- Comment #19 from Alex Deucher <alexdeucher@gmail.com> ---
Certain panels can be really picky about sequencing or delays in the link
training.  I suspect there are mainly just slight differences in the
programming sequences that some panels just don't like.  The core link training
code for DAL is here:
https://cgit.freedesktop.org/~agd5f/linux/tree/drivers/gpu/drm/amd/dal/dc/core/dc_link_dp.c?h=amd-staging-4.7

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John Brooks <bugs.freedesktop@fastquake.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.freedesktop.or
                   |                            |g/show_bug.cgi?id=100364

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https://bugs.freedesktop.org/show_bug.cgi?id=90320

Kyle Brooks <brookskd@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.freedesktop.or
                   |                            |g/show_bug.cgi?id=99779

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Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #20 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/611.

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