registry team mailing list archive

[Kamal Mostafa <kamal@xxxxxxxxxxxxx>]

@Ombako- Thanks for the feedback.

Regarding the minimum selectable backlight brightness value...  One of
the features of the patched gnome-power-manager in the PPA is that it
chooses to limit the minimum brightness value to 5% of the maximum value
for intel_backlight; it specifically doesn't set the brightness value
all the way down to 0.  The reason is that setting brightness to 0 for
intel_backlight results in the backlight being switched completely off
(on my Intel GPU systems at least), but the "standard" behavior for the
brightness control keys is that the lowest selectable value should be
very dim but not completely off.

Ombako, when you "echo 0 | sudo tee brightness" does your backlight
switch off completely like mine does?  If not (i.e. if your 0 value
actually results in very dim but not off) then I'll need to rethink my
assumptions about the minimum value situation.

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https://bugs.launchpad.net/bugs/568611

Title:
  Screen brightness control fails on Dell Studio 1558