[Bug 107033] Randomly black screen on boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107033

--- Comment #11 from Andriy Sa <bsd4fir at gmail.com> ---
(In reply to Ville Syrjala from comment #9)
> Absolutely nothing identifiable there :( Can you check the board to see
> which eDP->LVDS chip is mounted there? I would assume it's close by to the
> LVDS connector. I couldn't find any high res images of a N3060TN board (in
> fact I can't find anything really). I did find a picture of a N3160TN board
> but couldn't tell from that which chip it has.
Sorry, but it takes time to check the board.


(In reply to Manasi from comment #10)
> From the logs it looks like the eDP panel is not turned on fully before link
> training and so you see the AUX timeouts.
> Could you test it with i915.disable_power_well=0 boot parameter?
i915.disable_power_well=0 did not affect the problem

> You can also tell if eDP is on if intel_digital_port_connected() is
> returning true at that point where you see aux timeouts.
It looks like eDP is off at that point, intel_digital_port_connected() return
false

I add additional debug print in drivers/gpu/drm/i915/intel_dp.c;
intel_dp_aux_ch()
...
if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR) {
        bool port_status = intel_digital_port_connected(dev_priv,
dp_to_dig_port(intel_dp));
        DRM_DEBUG_KMS("dp_aux_ch intel_digital_port_connected = %d\n",
port_status);
        DRM_DEBUG_KMS("dp_aux_ch timeout status 0x%08x\n", status);
...


on dmesg
...
[    2.333004] [drm:intel_dp_aux_ch [i915]] dp_aux_ch
intel_digital_port_connected = 0
[    2.333055] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x70150064
[    2.335550] [drm:intel_dp_aux_ch [i915]] dp_aux_ch
intel_digital_port_connected = 0
[    2.335608] [drm:intel_dp_aux_ch [i915]] dp_aux_ch timeout status 0x70150064
[    2.335623] [drm:drm_dp_dpcd_access [drm_kms_helper]] Too many retries,
giving up. First error: -110
[    2.335624] [drm] failed to retrieve link info, disabling eDP
...

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