In 12.04, the brightness is set to 50% by default, and is adjustable
with the brightness keys.
** Changed in: gnome-power-manager (Ubuntu)
Status: Incomplete = Fix Released
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Confirmed on Precise with kernel 3.2-31-generic. Brightness keys don't
change screen brightness, even after adding the 'acpi_backlight' option.
I can still manage by writing 1-7 to
/sys/class/backlight/acpi_video0/brightness.
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Hi Kamus, just tested Maverick on the very same Dell mini 10 using live usb,
and, unfortunately, it's still the same. When booting without the
'acpi_backlight=vendor' option, the brightness keys don't work, the default
brightness is set to 100% and there is no apparent way to change it.
Please could somebody check if this behaviour is still occurring in
latest release included in Ubuntu Maverick? Thanks in advance
** Changed in: gnome-power-manager (Ubuntu)
Status: Confirmed = Incomplete
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g-p-m brightness not applied anymore after rebooting
I am going to write out a workaround for this bug, mostly for my own
amusement, and possibly for a stray soul wanting to use Karmic on a Dell
mini 10, and searching here in desperation. Apparently, Ubuntu devs have
to much on their hands to look bugs, let alone fixing them. It's a
little sad, but
** Changed in: gnome-power-manager (Ubuntu)
Status: Incomplete = Confirmed
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g-p-m brightness not applied anymore after rebooting
https://bugs.launchpad.net/bugs/503577
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The real issue here is that when pressing the brightness keys, the
brightness value in gconf is not updated so the new state is never saved
between sessions. That should be fixed properly rather than advising
users to try unsupported workarounds
** Changed in: gnome-power-manager (Ubuntu)
The real issue here is that when pressing the brightness keys, the brightness
value in gconf is not updated
I think you are oversimplifying this bug.
Well you do have much more experience than me but for me, there seems to be 3
sub-bugs in this bug:
1) Normal drivers are unable to update the
I am trying to summarise some info take from other bugs here.
In bug #230421, we learn that the following changed in the acpi-support package
in Ubuntu 9.10:
* Drop events/video_brightness{down,up}, video_brightness{up,down}.sh: at
least some platforms that use these ACPI sequences are
Could you elaborate a bit more on why it isn't a bug. I think it definitely is,
and I don't see how gnome power manager documentation is relevant. This, so
called, 'not a bug' made this netbook barely usable without sunglasses on.
Just to repeat, brightness keys were non-functional, and
** Summary changed:
- Gnome power manager ignores screen settings
+ g-p-m brightness not applied anymore after rebooting
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g-p-m brightness not applied anymore after rebooting
https://bugs.launchpad.net/bugs/503577
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Bugs,
Could it be:
acpi_backlight= [HW,ACPI]
acpi_backlight=vendor
acpi_backlight=video
If set to vendor, prefer vendor specific driver
(e.g. thinkpad_acpi, sony_acpi, etc.) instead
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