Comment #46 suggests to me the delay is in writes to
/sys/class/backlight/. Indeed they don't use much CPU time but take too
long to return. So that would make this a kernel bug...
** Tags added: bionic
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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** Package changed: gnome-shell (Ubuntu) => linux (Ubuntu)
** No longer affects: gnome-power-manager (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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Added gnome-shell to affected packages, as the issue is independent of
gnome-power-manager.
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https://bugs.launchpad.net/bugs/847001
Title:
Adjusting
Adding some more information. Running the following as root in a gnome
terminal:
SYSFILE=/sys/class/backlight/intel_backlight/brightness
OLD_VAL=$(cat $SYSFILE)
NEW_VAL=$((OLD_VAL + 100))
T0=$(date +%N)
time echo $NEW_VAL | tee $SYSFILE
T1=$(date +%N)
echo "Total time
Bug reappeared in 18.04.
Dell Precision M4800, running the standard Ubuntu Gnome shell desktop
(on Xorg), Intel Graphics. No issues in 16.04 (or perhaps a tiny
delay?), but unworkable in 18.04.
Both Fn-Up/Down and `echo value | sudo tee brightness` exhibit the delay
(~2-3 seconds normally).
Fixed on mine too.
Latitude E5430 on Ubuntu 14.04.1 LTS
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Title:
Adjusting display brightness is very slow on
It seems to be fixed on my machine now :)
Dell E6520
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Title:
Adjusting display brightness is very slow on several
My Dell Latitude E5430 only needed the kernel param adding to work
correctly.
Adding the xorg.conf file as well just caused it to oscillate rapidly
+/- 10% with a permanent on screen KDE brightness bar.
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Dell E7440, same problem on 14.04: very quick to change brightness using
intel_backlight command, but hardward keys (Fn-Up/Down) pause the
computer briefly.
Thanks to instruction from user Toz
(http://ubuntuforums.org/showthread.php?t=2208278), the fix requires both
acpi_backlight=vendor kernel
Updated from Ubuntu 13.10 to 14.04. Keyboard input is sluggish. When
typing one letter appears after I type the next one.
While changing brightness using fn + brightness key notification appears
but the brightness change after a long time or does not change at all. I
am using a Lenovo ThinkPad
Same issue on Dell Latitude E5430. Just freshly upgraded from Precise.
On Trusty:
- Using Fn+key is barely useable. Dimming by very tiny steps, and slow to react
(like 10s to get OSD, 10s more to get effect).
- Using brightness settings is also slow to react (10s-ish)
- Tom Chiverton's trick
Mine's better, too! E6420 as well.
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Title:
Adjusting display brightness is very slow on several Dell laptops
To
i suppose on my E5430 it's better, but not fixed.
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Title:
Adjusting display brightness is very slow on several
Not any better on 14.04 LTS beta 2
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Title:
Adjusting display brightness is very slow on several Dell laptops
To
Mone's better. 14.04 beta2, dell latitude e6420. a
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I am running Ubuntu Gnome 14.04 32-bit 3.13.0-17-generic and i also have this
problem.
I am on a Dell E6520.
Tom Chiverton: I can confirm that it is instantly, yes.
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I do confirm that changing brightness via command line is instant (while
the fn key combination is really slow).
I have a dell E5430 with ubuntu 13.10
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It looks like the issue doesn't persist in 14.04. I've only tried this
on a e6420 dell.a
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Can any one else confirm that directly changing via the command line is
instant ? It certainly is for me eg.
$ cat /sys/class/backlight/intel_backlight/max_brightness
976
$ cat /sys/class/backlight/intel_backlight/brightness
123
$ echo 600 | sudo tee
Also occurs on my Dell Latitude E5430
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Title:
Adjusting display brightness is very slow on several Dell laptops
Might this be upstream kernel issue :
https://bugzilla.kernel.org/show_bug.cgi?id=63931 ?
** Bug watch added: Linux Kernel Bug Tracker #63931
http://bugzilla.kernel.org/show_bug.cgi?id=63931
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same problem on Olivetti Olibook S1530
Intel HD 3000
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Title:
Adjusting display brightness is very slow on several
I'm experiencing this too, using Ubuntu 13.10 on Dell E6530 laptop.
After pressing Fn+up/down, nothing happens for 1-2s, then the brightness
is changed, then the OSD for it pops up. I can only change the backlight
in steps with this frequency.
During that waiting, the whole system (terminals,
Same problem on HP 630 running up to date Ubuntu 12.04 64bit.
The acpi_backlight=vendor workaround did not solve the problem at all.
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Though, interestingly, after applying the workaround, if I put the
computer to sleep / standby and wake it up again, the fn keys work fine.
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I see this on my HP DV6T 7000 in Ubuntu 13.04. The workaround in #17
does not work for me.
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Title:
Adjusting
Ubuntu 12.04 + fn keys on my ASUS K72D = 27 seconds delay
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Title:
Adjusting display brightness is very slow on
I haven't tested this on 13.04 yet.
I kind of prefer Centos now as it seems more stable and long-term supported,
and I'd rather have my apps running smoothly on a stable yet secure system.
On Sun, Apr 28, 2013 at 3:32 AM, Sparhawk 847...@bugs.launchpad.net
wrote:
I'm not sure if it's related,
Hi,
this bug seems to have reappeared, I didn't have any issue on 12.10.
Since I upgraded to 13.04, the brightness adjustement is sluggish, it
takes 2 seconds or more after pressing the Fn keys.
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I'm not sure if it's related, but I cannot change brightness at all any
more on my Dell l xps 17 l702x, since the upgrade to (k)ubuntu 13.04.
More info here https://forum.kde.org/viewtopic.php?f=63t=110984
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This seems to be fixed in Quantal (12.10). I didn't configure any
workaround and the brightness adjustment feels snappy after upgrading to
12.10.
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Hi Sparhawk,
No, I'm not using bumblebee, and I don't have a nVidia grapghics card on any of
the indicated Dell laptops.
Dell E5410, E5420 and E6420.
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As chrmhoffmann suggested, this bug may be the same as
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/828296
The workaround mentioned there works on my laptop. There is still some delay
(0.1s max), but almost unnoticeable!
Thanks lale. I can confirm that this workaround also works on my laptop
(Dell XPS 17 l702x).
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Title:
Adjusting
Thought I would post a confirmation a HP as well. Dv6t QE 7000 with
HD4000+GT650m Optimus and Ubuntu 12.04 x64, this same issues is
noticeable from a clean install all the way to installing Bumblebee.
Adjusting brightness via the brightness and lock window introduces lag
only momentarily and while
Okay guys, thanks for your consideration.
It looks like we're all experiencing this issue on the following hardware
products running Ubuntu:
Dell E and XPS series HP DV6t QE7000.
Looking at the list of Ubuntu's releases, it looks like 11.04 (Natty) will be
EOLed soon, more exactly October
Svens, are you using bumblebee too?
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Title:
Adjusting display brightness is very slow on several Dell laptops
To
Isn't that same as
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/828296
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Title:
Adjusting display
Also of possible interest. On my system I have three devices of class
backlight:
ls -l /sys/class/backlight/
total 0
lrwxrwxrwx 1 root root 0 Jun 12 14:17 acpi_video0 -
../../devices/pci:00/:00:01.0/:01:00.0/backlight/acpi_video0
lrwxrwxrwx 1 root root 0 Jun 12 13:39 acpi_video1 -
Interesting find!
FWIW, on my system, intel_backlight/brightness is fixed at 4319, but
acpi_video0/brightness is also fixed at 14. I could change the value of
acpi_video1/brightness from 0 to 15 by altering the brightness either
with the keys on my USB keyboard, or by using $ xbacklight -set n,
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