[Bug 59785] [dual-gpu regression] Display shuts off when switching to discrete graphics card

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59785

--- Comment #6 from David <dmallon83 at gmail.com> ---
Switching back to the intel card does indeed turn the screen back on. My Envy
14 has an i5-460m with a radeon 5650m. As far as I can tell, it seems like the
intel card drives the backlight control since prior to 3.7 I only had the
single backlight controller in /sys/class/backlight. Just looking at the commit
from the bisect I see two adds that I assume could potentially disable the
control of the display output settings:

+ dev_priv->display.crtc_disable(&intel_crtc->base);

+ for_each_encoder_on_crtc(dev, crtc, encoder)
+   encoder->disable(encoder);

Thanks for the quick response, and let me know if there is more info I can
supply.

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