** This bug is no longer a duplicate of bug 740893
Kernel 2.6.38-7 completely dims screen on Intel GMA 4500M
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Title:
Upgrade to version 11.04,
Diogo Coelho, thank you for reporting this and helping make Ubuntu better.
Natty reached EOL on October 28, 2012.
Please see this document for currently supported Ubuntu releases:
https://wiki.ubuntu.com/Releases
We were wondering if this is still an issue in a supported release? If
so, could
*** This bug is a duplicate of bug 740893 ***
https://bugs.launchpad.net/bugs/740893
Hello, just to answer to kamal: the patched kernel, with the parameter
acpi_backlight=vendor does nothing... I am still with 2.6.35-30.
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*** This bug is a duplicate of bug 740893 ***
https://bugs.launchpad.net/bugs/740893
** This bug has been marked a duplicate of bug 740893
Kernel 2.6.38-7 completely dims screen on Intel GMA 4500M
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@Kamal i have an Acer Aspire and had the backlight issue, tried the
acpi_backlight change to the grub but didnt notice any improvement ie
screen was still dark at startup. I then used the decrease backlight and
this increased the brightness, so it seems that the settings are
inverted as using the
I see no change with the patched kernel. :(
The machine is Acer Aspire 5732Z.
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Title:
Upgrade to version 11.04, disable the laptop display back
@Alejandro- Thanks for your report that the patched 'inverted-
backlight' kernel (from comment #56) fixes it for your HP dm-4
notebook... Do you still have the Acer Aspire 4736Z that you mentioned
in #27, and could you test it on that machine?
@Riccardo- Be sure to try the patched kernel along
Kamal,
the patched kernel solves the backlight off at startup problem on my HP dm-4
notebook (acpi_backlight=vendor).
thanks
Alejandro
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Title:
I have prepared a PPA test kernel for Ubuntu 11.10 (Oneiric) including a
patch which might address the inverted backlight brightness or
backlight off at startup problems, for laptops with a Intel GPU's
only:
https://launchpad.net/~kamalmostafa/+archive/inverted-backlight
Feedback to this bug
** No longer affects: null
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Title:
Upgrade to version 11.04, disable the laptop display back light
To manage notifications about this bug go to:
I have an acer Aspire 5732Z with intel GMA 4500M graphics running
Linuxmint 11. The sudo setpci fix as outlined in post #33 works for me
as long as I boot on battery.
If I connect the laptop to a power source and boot I end up with a blank
screen. However I can then get the login screen by
@cgonzalez and anyone else:
Since the screen also goes dark when resuming from suspend or other
purposes, and rc.local doesn't get run at that time, I've also added the
relevant setpci command to root's crontab, to be executed every minute.
That way, the screen isn't black for more than a minute.
Every event that turns off the screen's backlight lets the system
unaccessible, even the energy saving ...
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Title:
Upgrade to version 11.04,
Here is a workaround that did the trick on my acer 7715 with GMA4500
chip:
The following command has solved my problem.
sudo setpci -s 00:02.0 F4.B=00
The best is to have this command executed automatically at start up. You
can do that by including that command in your /etc/rc.local file. To
Tested the latest update to 11.10 at the weekend and the screen is still
dark.
My diagnostic information can be found in bug 740893 at the below link.
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/740893/comments/8
Kernel 2.6.35.22 show a fully bright screen.
Kernel 2.6.38-8 was the
Thanks for that, however the command reports missing width.
I'm guessing this has something to do with the B=00 part but I don't
know what hex value to set, can you shed any light on the situation?
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That solution only works after boot / resume, and with
acpi_backlight=vendor
And in my case the backlight control it also inverted
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@Gary
I am sorry, but I can't . I just reported the solution from the
duplicate bug (752165) that solved my unlit bakclight problem. You
might try the original author (Angel Zone) to shed any backlight on this
situation.
My experience is that The sudo setpci -s 00:02.0 F4.B=00 command only
@cryd_be
Thanks for your reply, i've now seen the light ;)
I've added this (sudo setpci -s 00:02.0 F4.B=00) command to the rc.local
file and the screen is now starting up.
I can also report that supertuxkart does not cause the screen to go dim
again, as reported in another bug regarding this
This bug needs to be fixed. Following liveCD's / LiveDVD's do not work:
ubuntu 11.04; Linux Mint 11; Mandriva 11... How do you expect to convert
closed source users if even the screen does not work? Still at 10.04 LTS
which works just fine except for brightness adjustment.
Acer machine with
Same behavior on Shuttel X50, only boot-option acpi=off works.
thx for bug fixing.
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Title:
Upgrade to version 11.04, disable the laptop display
Latest kernels don't fix it i tested it with 3 rc7 and the bug remains
https://bugzilla.kernel.org/show_bug.cgi?id=35072
Please someone help us... this bug is critical
** Bug watch added: Linux Kernel Bug Tracker #35072
http://bugzilla.kernel.org/show_bug.cgi?id=35072
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I have a Acer Aspire 4736z with a new installation of natty i386 from
iso and had a blank screen when booting without nomodeset.
I managed to work around my issue by adding the modules i915.o, drm.o ,
drm_helper.o and video.o to the initrd and booting with the kernel
parameter acpi=force .
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** Tags removed: upstream-testing-needed
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Title:
Upgrade to version 11.04, disable the laptop display back light
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** Bug watch added: Linux Kernel Bug Tracker #37662
http://bugzilla.kernel.org/show_bug.cgi?id=37662
** Also affects: linux via
http://bugzilla.kernel.org/show_bug.cgi?id=37662
Importance: Unknown
Status: Unknown
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** Changed in: linux
Status: Unknown = Confirmed
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Title:
Upgrade to version 11.04, disable the laptop display back light
To manage
I will confirm that it is an Issue in the kernal, it stopped working on
my Acer 5732Z when I updated to the most recent kernal. Which i can't
see without a backlight
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using acpi_backlight=vendor as kernel parameter doesn't work for me :(
however, some people found solution from this thread:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/752165
in my case, its true that I can get my backlight work again by using
setpci command and add it to my rc.local
Hello Ghozy
can ypou please install the latest mainline kernel, clicking on the followings
links
1 - http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.0-rc1-oneiric
/linux-headers-3.0.0-0300rc1_3.0.0-0300rc1.201105310830_all.deb
2 - http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.0-rc1-oneiric
Hi,
it works using acpi_backlight=vendor as a kernel parameter
Just edit /boot/grub/grub.cfg and add acpi_backlight=vendor to
GRUB_CMDLINE_LINUX_DEFAULT:
GRUB_CMDLINE_LINUX_DEFAULT=acpi_backlight=vendor quiet splash
Then execute:
# sudo update-grub
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Hello Alejandro,
Ok, I don't find the GRUB_CMDLINE_LINUX_DEFAULT: in /boot/grub/grub.cfg
Where i should add GRUB_CMDLINE_LINUX_DEFAULT=acpi_backlight=vendor quiet
splash?
thanks
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Correction: Is't is in /boot/grub/grub.cfg but is in /etc/default/grub
Still not work in my machine.
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Title:
Upgrade to version 11.04, disable
PS: Booting my old kernel 2.6.35-28-generic, the backlight works again.
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Title:
Upgrade to version 11.04, disable the laptop display back light
Guys I told you. I have solved the problem. Don't you read?
On Mon, May 16, 2011 at 8:07 PM, Diogo Coelho
779...@bugs.launchpad.netwrote:
PS: Booting my old kernel 2.6.35-28-generic, the backlight works again.
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kernel 2.6.35-28-generic has the same problem with my acer aspire
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Title:
Upgrade to version 11.04, disable the laptop display back light
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Sorry, using the suggested kernel doesn't fix the problem. I'm having
this issue on gma 950 on a shuttle x50
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Title:
Upgrade to version 11.04,
I have same problem..
Mine is Acer Aspire 4736 with Intel GMA 4500M.
Linux - 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 i686 i686
i386 GNU/Linux
I run this command under no-backlight condition on terminal (I still can read
my screen under flashlight):
sudo setpci -s 00:02.0
Hello
There's someone that want to test the latest upstream kernel above suggested,
it is fully functional on my system, so please try it without problems and
refere if it fix this issue.
Thanks
Fabio
** Tags added: upstream-testing-needed
** Tags removed: 11.04 back backlight display laptop
Same problem with kernel v2.6.39-rc7-oneiric on ACER ASPIRE 4736Z (ubuntu natty)
thanks
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Title:
Upgrade to version 11.04, disable the laptop
Hello Alejandro
can you please attach here using the button below 'Add attachment or patch the
file:
/var/log/dmesg
of the rc7 kernel
Thanks
Fabio
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Hi Fabio,
attached you will find /var/log/dmesg and /var/log/Xorg.0.log
thanks
Alejandro
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Title:
Upgrade to version 11.04, disable the laptop
** Attachment added: Aspire 4736Z dmesg
https://bugs.launchpad.net/null/+bug/779166/+attachment/2128942/+files/dmesg
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Upgrade to
** Attachment added: Aspire 4736Z Xorg.0.log
https://bugs.launchpad.net/null/+bug/779166/+attachment/2128943/+files/Xorg.0.log
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the kernel guys talk about the same problem here http://us.generation-
nt.com/answer/2-6-38-rc2-acpi-backlight-control-missing-
help-201853772.html
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Also if you see the bios screen at startup, please try to follow this guide to
evaluate an acpi issue
https://wiki.ubuntu.com/DebuggingACPI#Trouble%20Booting
Thanks
Fabio
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Hello Diogo
Sorry but i cannot found anything wrong in kernel logs, so i'm asking if you
can see the bios screen at startup.
If not that mean that the lamp is broken.
Fabio
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Also can you please install the latest mainline kernel clicking on these
links in this order:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.39-rc5-oneiric/linux-
headers-2.6.39-020639rc5_2.6.39-020639rc5.201105041556_all.deb
apport information
** Tags added: apport-collected natty running-unity
** Description changed:
My laptop is a Acer Aspire 5732Z. When the system finish the update and
reboot, at startup the display back light is off.
- PS: I'm unable to register/login in
-
hello Fabio
To run the command i connect a external screen to my laptop.
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Upgrade to version 11.04, disable the laptop display back light
temporarily assigned to collect data
** Package changed: ubuntu = linux (Ubuntu)
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Title:
Upgrade to version 11.04, disable the laptop display
hello Diogo
Can you please run in a terminal
apport-collect -p linux 779166
Thanks
Fabio
** Changed in: linux (Ubuntu)
Status: New = Incomplete
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** Also affects: ubuntu
Importance: Undecided
Status: New
** Project changed: launchpad = null
** Changed in: null
Status: New = Invalid
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