[Bug 65995] [HSW mobile Acer notebook] eDP can't light up in boot to text mode

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65995

Paulo Zanoni <przanoni at gmail.com> changed:

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                 CC|                            |przanoni at gmail.com

--- Comment #18 from Paulo Zanoni <przanoni at gmail.com> ---
(In reply to comment #0)
> Created attachment 81148 [details]
> dmesg: eDP can't light up when machine booting up
> 
> Environment:
> ---------------------
> HW info: 
> Acer Haswell Notebook Aspire V3 772G 17.3 ; 
> Host bridge ID=0x0c04 (rev 06);
> VGA ID=0x0416 (rev06);
> CPU: i7-4702MQ 2.2GHz; 
> BIOS:v1.04 MEM: 4G ;
> 
> Kernel: (drm-intel-nightly)19b2dbde5732170a03bd82cc8bd442cf88d856f7
> Some additional commit info:
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Wed Jun 12 10:15:12 2013 +0100
> 
>     drm/i915: Restore fences after resume and GPU resets
> 
> Description:
> ---------------------
> I have tried many kernels, when machine boot up, eDP can display well in
> BIOS, but failed to display after system finished initialized. If I removed
> i915, eDP can display again.
> 
> The followed phenomenon:
> 1. eDP failed to display if boot to level 3.
> 2. eDP light up again by start X(but it need to connect another display
> pipe).

The last time I saw a problem with such description on my machine, it was a
Backlight bug.

What if you boot to level 3, then start X, then SSH to the machine and
"DISPLAY=:0 xrandr --output eDP1 --set BACKLIGHT 15"?

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