*** This bug is a duplicate of bug 765438 ***
https://bugs.launchpad.net/bugs/765438
This is actually a duplicate of the rather old bug 765438. Marking as
such.
** This bug has been marked a duplicate of bug 765438
On startup, the backlight is off on laptop
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** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/910536
Title:
Screen too dark, no backlight, unusable X
To manage notifications ab
@brad-figg: I did the tests you asked me.
I now ran dist-upgrade and booted with the Acer laptop that suffers from this
issue. It turned out the old workaround in comment #4 stopped working in the
new kernel 3.2.0-18, that is in /etc/default/grub line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acp
@sma,
One bug per bug report. Please file a new bug on the hibernate issue.
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Title:
Screen too dark, no backlight, unusable X
To manage notifica
An additional problem is, when the computer wakes up after
hibernate/standby, the screen will stay black.
I found three workarounds, that promise to solve this problem:
1) http://ubuntuforums.org/showthread.php?p=11423423#post11423423
2) http://ubuntuforums.org/showpost.php?p=11578848&postcount=
@bradd,
The laptop in question is not my own, so I'm not sure when I'll be able
to visit it and test the other workarounds (#5 and #8). The workaround
in #4 has been working, so from this particular users point of view the
situation is not critical. But eventually I'll test the other
workarounds t
@otto,
Can you take a look at the suggestion in #8 and see if that workaround
does indeed help?
** Changed in: linux (Ubuntu)
Importance: Undecided => High
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I guess this bug is the same issue as discussed in this bugreport:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/826386 (No
backlight display Acer Aspire 5734Z).
Maybe the workaround described in #33
(https://bugs.launchpad.net/ubuntu/+source/linux/+bug/826386/comments/33)
still works. See
Thank you for taking the time to file a bug report on this issue.
However, given the number of bugs that the Kernel Team receives during
any development cycle it is impossible for us to review them all.
Therefore, we occasionally resort to using automated bots to request
further testing. This is s
Likely to be either kernel or perhaps gnome-power-manager.
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
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Title:
Screen too dark, no backli
I have acer aspire 5734z with gma 4500 running archlinux. best solution
for me is adding GRUB_CMDLINE_LINUX="acpi_osi=Linux" to
/etc/default/grub then update grub. still starts dark but brightness
keys work. it is kernel issue not the operating system. See here
https://lkml.org/lkml/2011/4/5
I now also got the Fn+Arrow-buttons working by adding the kernel option
"acpi_backlight=vendor" if found while googling around.
Make change permament by editing row in /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
and then run "sudo update-grub"
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I added now an external monitor to the laptop so that I could investigate what
state its is in when booted withouth "acpi=off". It
turns out that with ACPI enabled, the xrandr brightness range is 0-9:
$ xrandr --prop
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
LVDS1 conn
I noticed that running manually
xrandr --output LVDS1 --set BACKLIGHT 0
makes the screen brightness maximum.
If I boot without acpi=off and run the xrandr-command, nothing happends.
None of the Fn-key work either as acpi is on, so I guess the ACPI is
broken.
To make the screen as dim as possible,
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Title:
Screen too dark, no backlight, unusable X
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