Bug#772440: linux-image-3.16.0-4-amd64: Built-in display dimmed black if external monitor is plugged in
I found that the kernel option
video.use_native_backlight=0
fixes these issues. Brightness is always at a reasonable level and
adjustable again. (In fact unfortunately it can't be dimmed to black
anymore, which on the upside avoids unreasonable defaults.)
Tested for Linux 3.16 and 3.17.
$ ls /sys/class/backlight/
acpi_video0 intel_backlight
So what to do now to get this fixed both for Jessie (at least document
it in some general way) and in the long run (I guess file upstream
report for the adjust issue)?
Greets
jre
btw: I was hinted to this workaround by the similar, but not identical
bug reports https://bugs.debian.org/762285 and
https://bugzilla.kernel.org/show_bug.cgi?id=85051.
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