[Bug 112008] eDP -> Dual Channel LVDS bridge unable to accept any modelines: Corrupt display!

[Bug 112008] eDP -> Dual Channel LVDS bridge unable to accept any modelines: Corrupt display!

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=112008

            Bug ID: 112008
           Summary: eDP -> Dual Channel LVDS bridge unable to accept any
                    modelines: Corrupt display!
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: not set
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: Babblebones@gmail.com

Created attachment 145745
  --> https://bugs.freedesktop.org/attachment.cgi?id=145745&action=edit
kernel5.3-drm.debug=0xe

At my wits end on this bug. My bisecting have proven useless and I wanted to
get some help from you guys. Several reverted regressions reproduce the same
behavior along the way and I have spent hours sifting and booting to see where
it's at.

The short of it is that the monitor in my HP laptop boots to a 640x480 modeline
on mainline kernels newer than 4.17-rc3.
Would not be a colossal problem, as I can just force a working modeline from
userspace, if it didn't mean without the modeset the bridge utterly scrambles
the display by lining up 640x480 as a wrapping 2D length in the very top of my
screen as a jumble of colors.

The issue is GPU independent but is AMD related. Both W7170M and WX7100
affected.
Somewhere after kernel 4.17-rc3 the the rodeo begins.
My dmesg is probably going to be much much more helpful when it comes to
debugging and I will GLADLY test any kernel patches if you need more info &
detailed kernel/ custom dmesg dumps.

Notable stuff in the dump:

[    4.773991] [drm:amdgpu_vm_init [amdgpu]] VM update mode is SDMA
[    4.774149] [drm:drm_client_modeset_probe] 
[    4.774156] [drm:drm_helper_probe_single_connector_modes]
[CONNECTOR:59:eDP-1]
[    4.774159] [drm:drm_helper_probe_single_connector_modes]
[CONNECTOR:59:eDP-1] status updated from unknown to connected
[    4.774268] [drm:update_stream_scaling_settings [amdgpu]] Destination
Rectangle x:0  y:0  width:640  height:480
[    4.774278] [drm:drm_helper_probe_single_connector_modes]
[CONNECTOR:59:eDP-1] probed modes :
[    4.774282] [drm:drm_mode_debug_printmodeline] Modeline "640x480": 60 25175
640 656 752 800 480 490 492 525 0x40 0xa
[    4.774284] [drm:drm_helper_probe_single_connector_modes]
[CONNECTOR:63:DP-1]

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[Bug 112008] eDP -> Dual Channel LVDS bridge unable to accept any modelines: Corrupt display!

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https://bugs.freedesktop.org/show_bug.cgi?id=112008

--- Comment #1 from Babblebones@gmail.com ---
Created attachment 145746
  --> https://bugs.freedesktop.org/attachment.cgi?id=145746&action=edit
kernel4.17.0-rc3-drm.debug=4 (Good display)

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[Bug 112008] eDP -> Dual Channel LVDS bridge unable to accept any modelines: Corrupt display!

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=112008

--- Comment #2 from Babblebones@gmail.com ---
Created attachment 145747
  --> https://bugs.freedesktop.org/attachment.cgi?id=145747&action=edit
Screen Output

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[Bug 112008] eDP -> Dual Channel LVDS bridge unable to accept any modelines: Corrupt display!

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https://bugs.freedesktop.org/show_bug.cgi?id=112008

Babblebones@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|not set                     |high

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[Bug 112008] eDP -> Dual Channel LVDS bridge unable to accept any modelines: Corrupt display!

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https://bugs.freedesktop.org/show_bug.cgi?id=112008

--- Comment #3 from Babblebones@gmail.com ---
Created attachment 145748
  --> https://bugs.freedesktop.org/attachment.cgi?id=145748&action=edit
EDID.bin

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[Bug 112008] eDP -> Dual Channel LVDS bridge unable to accept any modelines: Corrupt display!

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https://bugs.freedesktop.org/show_bug.cgi?id=112008

--- Comment #4 from Alex Deucher <alexdeucher@gmail.com> ---
Can you use git bisect the issue and find the exact commit that broke it or
narrow down when the regression happened?  E.g., working in 4.17-rc3 and broken
in 4.17-rc4?

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[Bug 112008] eDP -> Dual Channel LVDS bridge unable to accept any modelines: Corrupt display!

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https://bugs.freedesktop.org/show_bug.cgi?id=112008

--- Comment #5 from Babblebones@gmail.com ---
(In reply to Alex Deucher from comment #4)
> Can you use git bisect the issue and find the exact commit that broke it or
> narrow down when the regression happened?  E.g., working in 4.17-rc3 and
> broken in 4.17-rc4?

I have two commits that break my EDID reading and cause the exact same issue so
far.

bisected the mainline to try and find the issue, trailed into your drm-next
git...

The first commit I found that broke my EDID read:
https://cgit.freedesktop.org/~agd5f/linux/commit/?h=amd-staging-drm-next&id=8a61bc085ffab3071c59efcbeff4044c034e7490
Was later reverted.

Followed more commits after this one down a branch and into here...
https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86-urgent-for-linus&id=bd4caed47a19f25fe8674344ea06d469c27ac314

Surprisingly, swapping out the memory allocs actually breaks the EDID read in
this commit/ branch too. I know for a fact Ubuntu's old kernel 4.18 reverted
this specific and the treewide memory allocation change, which worked!? I
stopped about here, my head was starting to spin as to why THAT would do
anything.

I am ready and able to fork over any binary/parameter/debug dumps to help solve
this.

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[Bug 112008] eDP -> Dual Channel LVDS bridge unable to accept any modelines: Corrupt display!

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https://bugs.freedesktop.org/show_bug.cgi?id=112008

--- Comment #6 from Babblebones@gmail.com ---
This may be useful to you!


[    4.603742] [drm:amdgpu_dm_initialize_drm_device [amdgpu]]
amdgpu_dm_connector_init()
[    4.604326] [drm:dm_dp_aux_transfer [amdgpu]] Op: Read, addr: 0000, SideBand
Msg: Nop, Op res: OK
[    4.604327] Body: 11
[    4.604699] [drm:dm_dp_aux_transfer [amdgpu]] Op: Read, addr: 0000, SideBand
Msg: Nop, Op res: OK
[    4.604699] Body: 11 06 84 00 01 00 00 00 00 00 00 00 00 00 00 00
[    4.604932] [drm:dm_dp_aux_transfer [amdgpu]] Op: Read, addr: 0000, SideBand
Msg: Nop, Op res: OK
[    4.604933] Body: 11
[    4.605160] [drm:dm_dp_aux_transfer [amdgpu]] Op: Read, addr: 0200, SideBand
Msg: Nop, Op res: OK
[    4.605161] Body: 41
[    4.605393] [drm:dm_dp_aux_transfer [amdgpu]] Op: Read, addr: 0000, SideBand
Msg: Nop, Op res: OK
[    4.605394] Body: 11
[    4.605700] [drm:dm_dp_aux_transfer [amdgpu]] Op: Read, addr: 0400, SideBand
Msg: Nop, Op res: OK
[    4.605700] Body: 00 00 00 00 00 00 00 00 00
[    4.605933] [drm:dm_dp_aux_transfer [amdgpu]] Op: Read, addr: 0000, SideBand
Msg: Nop, Op res: OK
[    4.605933] Body: 11
[    4.606178] [drm:dm_dp_aux_transfer [amdgpu]] Op: Read, addr: 0409, SideBand
Msg: Nop, Op res: OK
[    4.606178] Body: 00 00 00
[    4.606218] [drm:dc_conn_log_hex_linux [amdgpu]] 11 
[    4.606257] [drm:dc_conn_log_hex_linux [amdgpu]] 06 
[    4.606296] [drm:dc_conn_log_hex_linux [amdgpu]] 84 
[    4.606334] [drm:dc_conn_log_hex_linux [amdgpu]] 00 
[    4.606372] [drm:dc_conn_log_hex_linux [amdgpu]] 01 
[    4.606410] [drm:dc_conn_log_hex_linux [amdgpu]] 00 
[    4.606447] [drm:dc_conn_log_hex_linux [amdgpu]] 00 
[    4.606485] [drm:dc_conn_log_hex_linux [amdgpu]] 00 
[    4.606522] [drm:dc_conn_log_hex_linux [amdgpu]] 00 
[    4.606560] [drm:dc_conn_log_hex_linux [amdgpu]] 00 
[    4.606597] [drm:dc_conn_log_hex_linux [amdgpu]] 00 
[    4.606635] [drm:dc_conn_log_hex_linux [amdgpu]] 00 
[    4.606672] [drm:dc_conn_log_hex_linux [amdgpu]] 00 
[    4.606710] [drm:dc_conn_log_hex_linux [amdgpu]] 00 
[    4.606748] [drm:dc_conn_log_hex_linux [amdgpu]] 00 
[    4.606786] [drm:dc_conn_log_hex_linux [amdgpu]] 00 
[    4.606825] [drm:retrieve_link_cap [amdgpu]] Rx Caps: 
[    4.607189] [drm:dm_dp_aux_transfer [amdgpu]] Op: Write, addr: 0050,
SideBand Msg: Nop, Op res: OK
[    4.607192] [drm:drm_dp_i2c_do_msg] I2C nack (result=0, size=0
[    4.607559] [drm:dm_dp_aux_transfer [amdgpu]] Op: Write, addr: 0050,
SideBand Msg: Nop, Op res: OK
[    4.607561] [drm:drm_dp_i2c_do_msg] I2C nack (result=0, size=0
[    4.607925] [drm:dm_dp_aux_transfer [amdgpu]] Op: Write, addr: 0050,
SideBand Msg: Nop, Op res: OK
[    4.607926] [drm:drm_dp_i2c_do_msg] I2C nack (result=0, size=0
[    4.608290] [drm:dm_dp_aux_transfer [amdgpu]] Op: Write, addr: 0050,
SideBand Msg: Nop, Op res: OK
[    4.608291] [drm:drm_dp_i2c_do_msg] I2C nack (result=0, size=0
[    4.608661] [drm:dm_dp_aux_transfer [amdgpu]] Op: Write, addr: 0050,
SideBand Msg: Nop, Op res: OK
[    4.608662] [drm:drm_dp_i2c_do_msg] I2C nack (result=0, size=0
[    4.609021] [drm:dm_dp_aux_transfer [amdgpu]] Op: Write, addr: 0050,
SideBand Msg: Nop, Op res: OK
[    4.609022] [drm:drm_dp_i2c_do_msg] I2C nack (result=0, size=0
[    4.609381] [drm:dm_dp_aux_transfer [amdgpu]] Op: Write, addr: 0050,
SideBand Msg: Nop, Op res: OK
[    4.609383] [drm:drm_dp_i2c_do_msg] I2C nack (result=0, size=0
[    4.609741] [drm:dm_dp_aux_transfer [amdgpu]] Op: Write, addr: 0050,
SideBand Msg: Nop, Op res: OK
[    4.609742] [drm:drm_dp_i2c_do_msg] I2C nack (result=0, size=0
[    4.610189] [drm:dm_dp_aux_transfer [amdgpu]] Op: Write, addr: 0050,
SideBand Msg: Nop, Op res: OK
[    4.610190] [drm:drm_dp_i2c_do_msg] I2C nack (result=0, size=0
[    4.610549] [drm:dm_dp_aux_transfer [amdgpu]] Op: Write, addr: 0050,
SideBand Msg: Nop, Op res: OK
[    4.610550] [drm:drm_dp_i2c_do_msg] I2C nack (result=0, size=0
[    4.610587] [drm:dc_link_detect [amdgpu]] *ERROR* No EDID read.


Kernel 4.19 Gentoo stock

Any idea why dc_conn_log_hex_linux is so short?
Other people's connectors seem to get lots of hex data over the debug drop here
mine is nearly completely empty!

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[Bug 112008] eDP -> Dual Channel LVDS bridge unable to accept any modelines: Corrupt display!

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https://bugs.freedesktop.org/show_bug.cgi?id=112008

--- Comment #7 from Babblebones@gmail.com ---
The EDID seems the have some kind of proprietary tag block inbetween the last
and middle detailed modes.

Would this break parsing in more recent kernels? edid-decode seems to say that
this is breaks the standard.

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[Bug 112008] eDP -> Dual Channel LVDS bridge unable to accept any modelines: Corrupt display!

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https://bugs.freedesktop.org/show_bug.cgi?id=112008

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

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

--- Comment #8 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/938.

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