[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
Status changed to 'Confirmed' because the bug affects multiple users. ** Changed in: linux (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
** Package changed: gnome-shell (Ubuntu) => linux (Ubuntu) ** No longer affects: gnome-power-manager (Ubuntu) ** Changed in: linux (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
Added gnome-shell to affected packages, as the issue is independent of gnome-power-manager. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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 (millis): $(((T1 - T0)/1000))" Gives the following: real0m0.002s user0m0.002s sys 0m0.001s Total time (millis): 3502 In other words, the write to sysfs returns in 2ms (and indeed, brightness changes instantly), but it takes 3502ms for control to get back to the prompt. During that time, the system seems to hang, but keypresses are collected: they are all echoed to the terminal right after the command returns. So the question then is: where are the 3 seconds spent? I'm happy to experiment if someone has instructions. ** Also affects: gnome-shell (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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). Notable is that the brightness seems to change *immediately* after echoing into sysfs, so all the delay occurs in the return of the call back to the prompt. In /sys/class/backlight I have only intel_backlight. No difference with or without Backlight option in xorg.conf, nor with the acpi_backlight=vendor kernel param. Also notable: when performing the brightness change in a virtual terminal, it is *instantaneous*. The issue only occurs in the graphical VT running the desktop environment. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
Fixed on mine too. Latitude E5430 on Ubuntu 14.04.1 LTS -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
It seems to be fixed on my machine now :) Dell E6520 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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 param and creating the /usr/share/X11/xorg.conf.d/20-intel.conf file: --- Section Device Identifier card0 Driver intel Option Backlight intel_backlight BusID PCI:0:2:0 EndSection --- -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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 L430. Note: I did not have any such problem with Ubuntu 13.10 or previous version in the same laptop. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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 works instant (i.e. echo 600 | sudo tee /sys/class/backlight/intel_backlight/brightness) On Precise, I had some latency, but usually hammering the Fn+light key did the job just after a couple of secs. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
Mine's better, too! E6420 as well. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
i suppose on my E5430 it's better, but not fixed. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
Not any better on 14.04 LTS beta 2 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
RE: [Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
Mone's better. 14.04 beta2, dell latitude e6420. a href=https://overview.mail.yahoo.com?.src=iOS;br/br/Sent from Yahoo Mail for iPhone/a -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
RE: [Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
It looks like the issue doesn't persist in 14.04. I've only tried this on a e6420 dell.a href=https://overview.mail.yahoo.com?.src=iOS;br/br/Sent from Yahoo Mail for iPhone/a -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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 /sys/class/backlight/intel_backlight/brightness 600 $ echo 200 | sudo tee /sys/class/backlight/intel_backlight/brightness 200 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
Also occurs on my Dell Latitude E5430 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: 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 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
same problem on Olivetti Olibook S1530 Intel HD 3000 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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, mouse, keyboard, ...) becomes sluggish, CPU meter does *not* go up. I don't remember to change anything related since the install. The backlight stepping works find on the older Dell V13 laptop using Ubuntu 13.04 (though it had its own problems in the past -- one direction keypress behind). -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
Though, interestingly, after applying the workaround, if I put the computer to sleep / standby and wake it up again, the fn keys work fine. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
I see this on my HP DV6T 7000 in Ubuntu 13.04. The workaround in #17 does not work for me. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
Ubuntu 12.04 + fn keys on my ASUS K72D = 27 seconds delay -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
Re: [Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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, 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 -- You received this bug notification because you are subscribed to the bug report. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops Status in “gnome-power-manager” package in Ubuntu: Confirmed Bug description: Changing the brightness via FN key combination or via the brightness applet is very slow. the CPUs don't seem to go to 100%, but the adjustment process seems relatively slow. The mouse cursor is also sluggish. Reinstalled the OS twice, but not because of this issue and the problem seems to persist. ProblemType: Bug DistroRelease: Ubuntu 11.04 Package: gnome-power-manager 2.32.0-2ubuntu2.1 ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8 Uname: Linux 2.6.38-11-generic x86_64 Architecture: amd64 Date: Sun Sep 11 15:29:02 2011 GnomeSessionIdleInhibited: No GnomeSessionInhibitors: None GnomeSessionSuspendInhibited: No InstallationMedia: Ubuntu 11.04 Natty Narwhal - Release amd64 (20110427) MachineType: Dell Inc. Latitude E5410 ProcEnviron: LANGUAGE=en_US:en LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-11-generic root=UUID=0dfaacc9-c19d-425b-963d-dabb87ae18bc ro quiet splash vt.handoff=7 SourcePackage: gnome-power-manager UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/28/2011 dmi.bios.vendor: Dell Inc. dmi.bios.version: A09 dmi.board.name: 05C67D dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA09:bd01/28/2011:svnDellInc.:pnLatitudeE5410:pvr0001:rvnDellInc.:rn05C67D:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E5410 dmi.product.version: 0001 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- -- --- Constantin Roman/ Iasi, Romania. T:+40 754 236 958 / +40 731 394 551 W: www.svens.ro E: sv...@svens.ro / snev...@yahoo.co.uk -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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! https://bugs.launchpad.net/ubuntu/+source/linux/+bug/828296/comments/5 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
Thanks lale. I can confirm that this workaround also works on my laptop (Dell XPS 17 l702x). -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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 the brightness is actually changing. Adjusting via the laptop's keyboard has prolonged (10s?) effects on the mouse cursor and delay to the on-screen display pop-up. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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 2012. https://wiki.ubuntu.com/Releases I'm quite sure there won't be any fix for Natty, but I hope there will be for 12.04 as this is a long term support release. Cheers. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
Svens, are you using bumblebee too? -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
Isn't that same as https://bugs.launchpad.net/ubuntu/+source/linux/+bug/828296 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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 - ../../devices/pci:00/:00:02.0/backlight/acpi_video1 lrwxrwxrwx 1 root root 0 Jun 12 14:17 intel_backlight - ../../devices/pci:00/:00:02.0/drm/card0/card0-LVDS-1/intel_backlight Each of these devices has a file inside called brightness. The way these files change is interesting and suggests there is a probelem/confusion/interaction among acpi_video0 and acpi_video1 I could see what happens with the following command: watch -d -n 0.1 cat /sys/class/backlight/acpi_video0/brightness cat /sys/class/backlight/acpi_video1/brightness cat /sys/class/backlight/intel_backlight/brightness then watching how the values change in reaction to brightness keypresses. The intel_backlight/brightness value stands fixed at 497 The acpi_video0/brightness and acpi_video1/brightness values are normally not the same. e.g. the following happens: Values are: 6 -- 7 then I do one Fn+ArrowUP keypress for increasing brighness. After 1s, values become (but brightness does not change): 8 -- 7 Then after 1s and at 0.5s intervals, they change to 8 -- 9 8 -- 10 8 -- 11 One thing it always happens is that after a single keypress of brightness up (down), the first value acpi_video0/brightness gets the value of acpi_video1/brightness plus (minus) one, respectively. Then acpi_video1/brightness continues to change in the same direction. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
[Bug 847001] Re: Adjusting display brightness is very slow on several Dell laptops
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, where n is a number (0 to 100). For some reason the internal keyboard's brightness buttons are not working at the moment, but I've been having 3 different kinds of Unity crashes almost every day, so there's no certainty that my system is currently 100% functional! -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on several Dell laptops To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/847001/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
