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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #6 from Babblebones at 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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