** Changed in: gnome-power-manager (Ubuntu)
Assignee: Ted Gould (ted) = (unassigned)
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https://bugs.launchpad.net/bugs/285815
Title:
Backlight keeps getting darker on MacBookPro
Thank you for taking the time to report this bug and helping to make
Ubuntu better. We are sorry that we do not always have the capacity to
look at all reported bugs in a timely manner. There have been many
changes in Ubuntu since that time you reported the bug and your problem
may have been fixed
Workaround for this bug is to uncheck the Use ambient light to adjust
LCD brightness which is found on the General tab in Gnome's Power
management preferences.
The patch is in the source for applesmc-dkms - 0.14.4-0ubuntu1~mactel-
support1~jaunty5 from 2009-05-10 but still the screen is randomly
This patch is about making the applesmc driver report sensible values
for the ambient light sensor - it has already been integrated into the
applesmc dkms package in the mactel ppa so if you're running that then
you've already got it and don't need to do anything with the patch
itself.
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Thanks for the explanation.
But does it really do its job? I mean, If I use the ambient light sensor
checkbox (under in g-p-m), it only brings display brightness down to a
certain level ( using an MBP5,1). There is no other reaction against
ambient light inensity.
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Backlight keeps getting
Hi! How can I use the patch to test in MBP5,1? Is there any step-by-step
documentation?
Thanks, Nikos
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Backlight keeps getting darker on MacBookPro
https://bugs.launchpad.net/bugs/285815
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Sorry for the 2nd post: I am confused. Is this about scaling the sensor
readings to have actually ambient light adjust the brightness
(display/keyboard) or not?
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Backlight keeps getting darker on MacBookPro
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You received this bug notification because you
Thanks for the feedback rydberg - after looking into it some more it
seems the new MBP / MBA's use the 10 byte light value from the left
sensor as follows:
first 2 bytes seem to always be 01
next 2 bytes are a big endian 16-bit value of the ambient light value with a
maximum value of 65535
next
Actually scrub the previous patch - this one is much simpler and doesn't
break the case for the old machines.
** Attachment added: Improved patch
http://launchpadlibrarian.net/21101822/applesmc-dkms-light-sensor-fix.patch
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Backlight keeps getting darker on MacBookPro
Alex Murray wrote:
Actually scrub the previous patch - this one is much simpler and doesn't
break the case for the old machines.
** Attachment added: Improved patch
http://launchpadlibrarian.net/21101822/applesmc-dkms-light-sensor-fix.patch
Thank you for the patch! This one seems neat;
Although I am happy that you are looking into this problem, I think the
patch is doing the wrong thing:
1. It is introducing more state to the desktop setup - it should be
possible to determine the right scaling automatically.
2. The scaling factor in the patch is integral - this is causing all
I guess we need to first get the values which the light sensor reports
for each of the different models under varying light conditions - then
we can identify which models need correcting / scaling for - ie. as I
mentioned before my MBP 5,1 reports only 4 out of 255 in a reasonably
well lit room so
See new bug report which I just opened for a patch to add light_scale to
applesmc-dkms https://bugs.launchpad.net/mactel-support/+bug/315485
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Backlight keeps getting darker on MacBookPro
https://bugs.launchpad.net/bugs/285815
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Alex,
I am pretty sure that the mactel-support team can get most, if not all,
of the of the Apple portables covered from users in the forum. Just let
us know what you need from each model.
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Backlight keeps getting darker on MacBookPro
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You received this
By improving the driver, do you mean getting it to scale values based
upon which machine it is running on to report a larger dynamic range
under 'normal' light conditions? This should be relatively straight
forward, provided we can obtain some data about which machines report
these lower values -
So it seems to be reading quite low
Yes, this is the experience on several models: MBA11 and MBP41 fall into
the same category as your MBP51. The readings are low, but the full span
0-255 is actually used, which can be seen when exposing the sensor for
extreme light. The real problem seems to be
I am seeing this same bug on my MacBook Pro 5,1 with Ubuntu 8.10 using
the mactel-support ppa with all relevant packages from the PPA installed
and kernel modules loaded. This includes the updated package of gnome-
power-manager from the PPA, and the only way to fix the problem is to
disable the
Seems I needed to adjust the correction_factor gconf key in gnome-power-
manager - in good light, the light sensor would be
cat /sys/devices/platform/applesmc.768/light
(4,0)
and then covering it with my hand, I'd get
cat /sys/devices/platform/applesmc.768/light
(0,0)
So it seems to be
Thanks for your work, Ted could you have a look to the patch? thanks.
** Changed in: gnome-power-manager (Ubuntu)
Importance: Undecided = Low
Assignee: (unassigned) = Ted Gould (ted-gould)
Status: New = Confirmed
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Backlight keeps getting darker on MacBookPro
** Changed in: mactel-support
Status: New = Fix Released
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Backlight keeps getting darker on MacBookPro
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** Also affects: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: New
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Backlight keeps getting darker on MacBookPro
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Here is a patch to gnome-power-manager that seems to fix the problem.
** Attachment added: 94-fix-light-sensor-scaling.patch
http://launchpadlibrarian.net/19552469/94-fix-light-sensor-scaling.patch
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Backlight keeps getting darker on MacBookPro
https://bugs.launchpad.net/bugs/285815
You
This is a continuation of the problem adressed with upstream commit
95bd4f1bf9a62f1551461841d64f6f1cdea6a92e, to this problem:
https://bugs.launchpad.net/ubuntu/+source/hal/+bug/226894
It is correct that MacBookPro3,1 and later are not listed to use the
macbookpro addon. However, the
** Also affects: mactel-support
Importance: Undecided
Status: New
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Backlight keeps getting darker on MacBookPro
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