[Bug 70406] Can't turn on laptop screen without changing its resolution first

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70406

--- Comment #22 from reztho at archlinux.us ---
(In reply to comment #21)
> The issue with interpreting 0 as off in the ddx is that it is only
> definitely true for intel_backlight. For an ACPI backlight, 0 means the low
> brightness as defined by the firmware which may be a valid setting that the
> user requests. My only suggestion is to shout at whatever userspace is
> setting the backlight to 0 after turning off the display and asking them
> whether they are serious?

I made another test.

I stopped the desktop manager (lightdm) and run Xorg with a simple startx, so
no desktop environment, just plain xorg. It started with both screens on. I
used xrandr to turn off the laptop screen (--output LVDS1 --off) and kept on
the external screen. Xrandr --verbose showed me the backlight properties set to
0. And then I run the first xrandr command from the very beginning of this
entire thread... and again, the laptop screen doesn't turn on: the backlight
properties are still 0. So with no desktop environment, just plain xorg, the
problem is still there.

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