** Changed in: linux
Importance: Unknown = Medium
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Title:
The slider brightness Applet has value inverted after the last update
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As there seems to be no one having the inverted values problem any more
I will close the Intrepid task. Won't fix because it is unclear whether
it was fixed in Intrepid but won't qualify for an SRU after Jaunty is
now released.
** Changed in: linux (Ubuntu Intrepid)
Status: Confirmed =
@gidantribal, the status incomplete in this case looks like it came from
the upstream bug report. But it could also be used by us to reflect that
we asked for more information and are waiting for that. Unfortunately
there is no launchpad state for that.
For this bug report, has anybody still
** Changed in: linux
Status: Incomplete = Fix Released
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Status Incomplete?? after 130 comments on it? things are two: or all
guys posting here are stupid or this bug is far from being incomplete...
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So I will open another bug for my ACER aspire 6920G... Because it seems
they are two different issues.
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So I will open another bug for my ACER aspire 6920G... Because it seems
they are two different issues.
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I just upgrade to jaunty and can confirm that it works there on a Lenovo
X300. Fn-keys change brightness correctly, the KDE guidance-power-
manager as well.
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@gidantriba, please look at my post and take bug #86 for this one.
I added some Intrepid test kernels today.
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You're right... it looks the same problem...
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** Changed in: linux
Status: Confirmed = Incomplete
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I confirm in my acer aspire 6920G the brightness control is BROKEN. I
also tried the jaunty-beta3, and I can report the following:
- HotKeys are correctly recognized (and notification works properly)
- Brightness is not affected using hotkeys, it cannot be changed.
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does it mean it has not been fixed even in jaunty? This page's header
claimed it has been fixed in jaunty???
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I would like to try to summarize the various issues as they appear to me
reading the comments. Unfortunately we now seem to have a whole
collection of similar but yet different problems in one huge bug and
maybe we could untangle it by splitting of separate bugs for those.
1. an inverted
The Fn-keys don't work for me on a Lenovo X300 with linux-
image-2.6.27-11-generic (intrepid). Changing throuhg guidance-power-
manager in kde4 works, though. I realized that pressing the Fn-keys for
brightness up and down changes the value of
/proc/acpi/video/VID/LCD0/brightness instead of
Ben,
# xrandr --output LVDS --set BACKLIGHT_CONTROL native
put backlight brightness control back into work on my Lenovo X300 - for
the current session. So I created a batch file to run at each startup
(attached). Simply put it into /usr/local/share/ and add it in sytem
settings - sessions.
Hi Till,
thanks for that comment and the script. Unfortunately, it doesn't seem
to have any effect on my system. It I run that under X in a term, the
backlight_control changes, but Fn-Keys still won't work. Do you load
thinkpad_acpi with specific options to make that happen? Do you have a
custom
** Changed in: linux
Status: Fix Released = Confirmed
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Regression not solved in linux distrib. 2.6.27-14-generic
I still have to use the 2.6.27-4-generic
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Yes, John Chia, I confirm your comment:
backlight control is broken. none of the module options above fixed it.
last known working kernel was linux-image-generic_2.6.27.11.14_i386.deb
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not fixed in 2.6.27-13-
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generic kernel 2.6.27-11.27 i386 on x61 tablet
backlight control is broken. none of the module options above fixed it.
last known working kernel was linux-image-generic_2.6.27.11.14_i386.deb
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works with linux-image-2.6.27-11-generic_2.6.27-11.23~lp311716apw1_i386
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not fixed in 2.6.27-12-generic
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Actually when I start the system under 2.6.27-11-generic x64 GNU/Linux (on acer
aspire 6920G)
- my directory '/proc/acpi/video' is EMPTY
- and LCD brightness can't be changed, both from terminal and FN keys.
- Plus, if I use FN keys, the applet reacts to Brightness- but doens't
Well...
grep -r . /proc/acpi/video/
/proc/acpi/video/VGA/LCDD/EDID:not supported
/proc/acpi/video/VGA/LCDD/brightness:levels: 15 14 13 12 11 10 9 8 7 6 5 4 3 2
1 0
/proc/acpi/video/VGA/LCDD/brightness:current: 13
/proc/acpi/video/VGA/LCDD/state:state: 0x1f
What I meant is what happen if you do:
sudo echo 15 /proc/acpi/video/VGA/LCDD/brightness
sudo echo 5 /proc/acpi/video/VGA/LCDD/brightness
If 5 is brighter than 15 then it could still be a kernel problem but
even then, maybe not..
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On Tue, Feb 17, 2009 at 04:14:49PM -, Olivier Bilodeau wrote:
What I meant is what happen if you do:
sudo echo 15 /proc/acpi/video/VGA/LCDD/brightness
sudo echo 5 /proc/acpi/video/VGA/LCDD/brightness
What happens is that you'll get a permissions failure, because the
redirection (
Or more compactly,
echo 15 | sudo tee -a /proc/acpi/video/VGA/LCDD/brightness
echo 5 | sudo tee -a /proc/acpi/video/VGA/LCDD/brightness
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Actually 5 makes my screen go darker and 15 lighter in intrepid.. I
can't test it on my Jaunty right now, as Im not at home. I will test as
soon I get home (Jaunty is installed on an external harddisk).
But kde powermanagement is working well in intrepid. Its in Jaunty I get
the problems. Will be
Jaunty has the same behaviour, so its probably not a kernel bug.
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@Oliver and others
Hmm in Jaunty my brightness keys works perfectly, but the brightness
applet in kde 4.2 is inverted? Should I open another bug, as this
diesn't seem to be a kernel bug?
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@Terrax
Well if you are 100% sure that the problem is not in the kernel but in
the package then yes I think you should check for bugs against the kde
power management package. First, maybe you want to try poking around in
/proc (specific files mentionned in previous bug comments) and make sure
So should we open another bug? do you need any detail to classify my
Aspire 6920G system?
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Unless there should actually be a separate bug, it seems that the most recent
comments indicate that brightness control is broken on some machines,
regressing from -9.
I can also confirm that on my Thinkpad X300.
** Changed in: linux (Ubuntu Intrepid)
Status: Fix Released = Confirmed
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Uhm.. this bug seems fixed?! In my system is not fixed at all...
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** Changed in: linux
Status: Incomplete = In Progress
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Still doesn't work for me either. Any workaround found here.
Acer Aspire 6920G and Ubuntu x64
So sad for this step backward..it worked on .11 proposed kernel before
that bad update
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Still doesn't do anything for the thinkpad SL300, sl400, sl500, and all
ideapads. Sl300 can't load thinkpad-acpi b/c the firmware is ideapad-
based.
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I have an R61i, and adding options thinkpad_acpi brightness_enable=1
to /etc/modprobe.d/options solved my problem. What confuses me is that
my problem showed up later than the other posters. Is there a way to
auto-detect when this option is necessary? My pre-fix system is
described in greater
On Tue, Feb 3, 2009 at 9:30 AM, odyseuss cxc...@gmail.com wrote:
Thanks a lot Scott. I own a X300 and your proposal really fixes my
brightness adjustment problem
in 2.6.27-11.
I'm glad it worked for you, but I can't take credit. I simply followed the
suggestion Stefan Bader gave to Tom
Thanks a lot Scott. I own a X300 and your proposal really fixes my brightness
adjustment problem
in 2.6.27-11.
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still no difference for months on my lenovo sl300 and probably every
other sl series and ideapad.
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I read somewhere it was possible to get the function of the keys back by
using an older kernel. Is there anyway to tell acpi to get its hands
off the brightness keys and video brightness without turning off acpi
completely? I don't care if gnome can't control my brightness, I just
want the
@Stefan @Andy
Sorry guys. Its not all perfekt yet. My brightness control in kubuntu
intrepid (kde 4.2 RC1) is inverted. That said, my brightness keys work
perfektly. But when the laptop switch to performance mode, my brightness
is decreased. When my laptop switch to battery mode, my laptops
@Terrax: I don't think your problem is related to this bug. I've seen
the behaviour you describe for battery mode, and it corresponds to
having the Reduce backlight brightness option checked in the On
Battery Power tab in gnome-power-preferences, then dimming the display
on AC power using the
The above posted fix
https://bugs.launchpad.net/ubuntu/intrepid/+source/linux/+bug/311716/comments/5
solves also the bug
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/319654 on my x300.
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GNOME brightness control worked in 2.6.28-4.10 but is no longer
functional in 2.6.28-5.15.
Just two brightness settings are left and both are quite unusable.
This seems to be the corresponding changelog entry:
linux (2.6.28-5.13) jaunty; urgency=low
[ Andy Whitcroft ]
* Revert SAUCE:
My earlier comments were all regarding -11.24. On a X61s vendor
backlight control has to be used. Without the modprobe option I can
write any value to the brightness controls in /sys or /proc w/o getting
any changes.
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linux (2.6.27-11.24) intrepid-proposed; urgency=low
[ Stefan Bader ]
* Revert SAUCE: don't use buggy _BCL/_BCM/_BQC for backlight control
- LP: #311716
* SAUCE: acpi: Hack to enable video and vendor backlight implementations
- LP: #311716
* SAUCE: Force vendor backlight control
** Attachment added: dsdt.txt
http://launchpadlibrarian.net/21282312/dsdt.txt
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I am having the same problems that Tom has (same kernels result in same
functionality) but with a Thinkpad X61s. I first noticed it a couple of
days before Xmas and tried to upgrade my BIOS from the almost oldest to
the current one. Did not make a difference though.
dmesg, /proc/acpi/video and
** Attachment added: dsdt.bin
http://launchpadlibrarian.net/21285279/dsdt.bin
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BTW, the modprobe option does restore the functionality for me as well.
** Attachment added: proc_acpi_video.txt
http://launchpadlibrarian.net/21285289/proc_acpi_video.txt
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newest kernel fixes my issue =]
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2.6.27-11.23 had working brightness controls for me on my Lenovo R61
with Intel graphics.
2.6.27-11.24 does not sadly. The controls don't function at all.
2.6.27-11.22 did not work either. Again the controls did not function at
all.
as far as I can remember kernel 2.6.27-11.21 and kernels prior
@Tom,
Can you please try options thinpad_acpi brightness_enable=1 in
/etc/modprobe.d/options?
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I assume you meant options thinkpad_acpi brightness_enable=1
That worked a treat though. All good now.
Cheers.
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Tom, it might be good if you could add your
dmesg
grep -r . /proc/acpi/video/
cat /proc/acpi/DSDT
here (from the working -11.24 case). So we can look into that more
closely. Thanks.
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dsdt is an empty file, 0 bytes so I'm not sure about that one.
grep -r . /proc/acpi/video/ :
/proc/acpi/video/VID/DVI0/EDID:not supported
/proc/acpi/video/VID/DVI0/brightness:not supported
/proc/acpi/video/VID/DVI0/state:state: 0x1d
/proc/acpi/video/VID/DVI0/state:query: 0x00
Its a proc file so it is always 0. But you have to be root to read it.
It will be a binary blob.
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works fine now :)
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@Stefan
Your newest kernel works fine :-)
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2.6.27-11.24 solves my problem too.
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New kernel has been compiled by now.
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@Stefan, the brightness controls in the 2.6.27-11.23smb5 kernel are
working fine on my t61 without needing any arguments for the video or
thinkpad_acpi modules. Attached is the usual dmesg, /proc/acpi/video,
and /sys/class/backlight information.
Thanks!
** Attachment added:
As the latest code has now worked for another T61. I commited that code
into a new kernel update.
** Changed in: linux (Ubuntu Intrepid)
Assignee: Andy Whitcroft (apw) = Stefan Bader (stefan-bader-canonical)
Status: Confirmed = Fix Committed
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This last kernel still works for me.
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Kernel 2.6.28-4.10 fixes this problem for me in Jaunty.
For the first time the brightness keys work correctly on my Asus B50A
laptop.
However in /var/log/messages these messages appear when pressing
brightness up/down keys:
Jan 13 22:13:54 asus kernel: [ 181.876404] ACPI Error (dswstate-0097):
@Stefan, Just to confirm you that 2.6.17-11.23smb5 works great on my
T61! Thanks!
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I'm on the Jaunty kernel Version: 2.6.28-4.10, and this last upgrade
just broke ACPI backlight control on my EliteBook 8530w, which happens
not to have any vendor module for backlight control. The
/sys/class/backlight dir is now empty. Interestingly enough, I also
have another laptop where the
(curse the lack of an edit feature)
More specifically, the EliteBook is using the x86-64 generic kernel.
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Some clarification for all. I think this went a bit confusing:
2.6.27-10: will have acpi and vendor backlight active
2.6.27-11: started to use only one of those (mostly because acer and sony
vendor drivers are incorrect)
2.6.27-11.*smb: should behave like 2.6.27-10 by default
So when 2.6.27-10
I tried 2.6.27-11.23smb2 on my lenovo t61, which had brightness broken
on -11.21 and -11.22. Brightness controls did not work at all with
2.6.27-11.23smb2; however, rebooting with option thinkpad_acpi
brightness_enable=1 caused the brightness controls to start working
once again.
options video
And here's the result of those commands when I booted 2.6.27-11.23smb2
with the thinkpad_acpi brightness_enable option set.
** Attachment added: kernel-test-2.6.27-11.23smb2-brightness-enable
http://launchpadlibrarian.net/21122198/kernel-test-2.6.27-11.23smb2-brightness-enable
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And for one last spam, dmidecode output.
** Attachment added: dmidecode_output
http://launchpadlibrarian.net/21122205/dmidecode_output
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@Steve Beattie, could you also add the output of grep -r .
/proc/acpi/video from the non-working case.
@Olivier, I am sorry to have told the wrong method. Though strange it
made a difference. The module should fail to load in either case...
Might I ask you to try out acpi_backlight=video as a
@Steve, sorry I should have read the attachments all to the end. Got
everything there.
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This bug was fixed in the package linux - 2.6.28-4.10
---
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[ Andy Whitcroft ]
* update kernel bootloader recommends: to prefer grub
- LP: #314004
* SAUCE: don't use buggy _BCL/_BCM/_BQC for backlight control
- LP: #311716
*
** Changed in: linux
Status: Confirmed = Incomplete
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I checked dmesg and I do get:
[ 11.294297] video: Unknown parameter `acpi_backlight'
...
[ 11.485042] video: Unknown parameter `acpi_backlight'
in dmesg but it still makes a difference for my backlight behaviour
since 2.6.27-11.23smb2 without the option doesn't work and with the
option
** Attachment added:
proc-acpi-video-olivier-2.6.27-11.23smb2-acpi_backlight_video
http://launchpadlibrarian.net/21147895/proc-acpi-video-olivier-2.6.27-11.23smb2-acpi_backlight_video
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With 2.6.27-11.23smb4 brightness doesn't work. Same behavior as
described before.
** Attachment added: dmesg-olivier-2.6.27-11.23smb4
http://launchpadlibrarian.net/21148220/dmesg-olivier-2.6.27-11.23smb4
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** Attachment added: proc-acpi-video-olivier-2.6.27-11.23smb4
http://launchpadlibrarian.net/21148223/proc-acpi-video-olivier-2.6.27-11.23smb4
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@Stefan
I have tested your kernel, and everything seems to work again. Thank you. I
don't have to specify acpi_backlight=vendor.
It works like it was the 2.6.27-10 kernel.
Have you reverted everything related to brightness, back to the state of
2.6.27-10?
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@Terrax,
sounds promising. :) Thanks for testing. I hope this goes similarly well for
the others. No I actually did not revert in that sense. I kept the new
infrastructure but added a new default. With the new code added to -11 it was
either acpi or vendor backlight control. While before
@Stefan
Your kernel works great for me too.
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https://bugs.launchpad.net/bugs/311716
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@Stefan
Your kernel (2.6.27-11.23smb2) doesn't work for me. I am exactly at the
same point as when I upgraded to the first proposed (2.6.27-11.22).
Which was, for me, the first regression. Before everything was fine in
2.6.27-10 and is fine also in the recently released in -proposed
2.6.27-11.23.
result of grep -r . /proc/acpi/video
** Attachment added: /proc/acpi/video for 2.6.27-11.23smb2
http://launchpadlibrarian.net/21086905/proc-acpi-video-olivier-2.6.27-11.23smb2
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The slider brightness Applet has value inverted after the last update
(2.6.27-11)
May I suggest changing the bug's title to something more generic like
brightness problems in 2.6.27-11 kernels because people searching for
bugs might not check this one because of the misleading title.
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The slider brightness Applet has value inverted after the last update
(2.6.27-11)
Stefan, your kernel update solved the problem for me, brightness change
now works, thanks!
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The slider brightness Applet has value inverted after the last update
(2.6.27-11)
https://bugs.launchpad.net/bugs/311716
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Bugs,
@Oliver
Did you try with:
options video acpi_backlight=vendor
in your /etc/modprobe.d/options?
--
The slider brightness Applet has value inverted after the last update
(2.6.27-11)
https://bugs.launchpad.net/bugs/311716
You received this bug notification because you are a member of Ubuntu
Bugs,
@Oliver
Or maybe instead add
acpi_backlight=vendor
as an kernel option?
--
The slider brightness Applet has value inverted after the last update
(2.6.27-11)
https://bugs.launchpad.net/bugs/311716
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to
No, I have not tried the options video acpi_backlight=vendor with the
2.6.27-11.23smb2 kernel.
@Stefan, regarding your comment 30
(https://bugs.launchpad.net/ubuntu/+source/linux/+bug/311716/comments/30)
I just tried setting options video acpi_backlight=vendor in
/etc/modules.d/options for kernel
@Terrax
Just tried options video acpi_backlight=vendor in
/etc/modprobe.d/options for kernel 2.6.27-11.23smb2 and I have the same
behavior I just reported for 2.6.27-11.22 above. The brightness controls
work but its not bright enough even at the max.
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The slider brightness Applet has value
@Oliver,
if the previously released -11.23 was fine for you, please try
acpi_backlight=video with my kernel. This should give you the default of
the previous -11.23.
--
The slider brightness Applet has value inverted after the last update
(2.6.27-11)
https://bugs.launchpad.net/bugs/311716
You
after the latest update (a day or two ago) i've experience two problems
(one mentioned already)
1) my fn up+down don't change brightness
2) when gnome-power-manager dims the backlight, it dims slowly and clunkily and
spikes my CPU usage to 100% and makes any playing audio skip
however adding
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