This bug also affects me with 12.04. I have a Dell E6520 with Intel+NVidia (optimus). I see different timings than Sparhawk
This happened both with a fresh installation, and after installing bumblebee. In both cases optimus was ON in the bios, but in the former case the system was falling back unity2D (I believe), and after installing bumblebee it uses unity3D (though always with the intel card). The bug happens regardless on whether the nvidia card is on (i.e. while optirun glxgears is running) or off. The bug also happens when switched to a virtual console with CTRL- ALT-F1. When I give one quick tap of brightness up using the laptop keyboard (Fn + Arrow up), I see the following: - 1 second delay, nothing happens - brightness is changed 1 step up - 0.4 seconds delay, during which at some point the brightness popup appears - brightness is changed another step up - 0.4 seconds delay - brightness is changed another step up (sometimes, and sometimes one step more). So with one tap I get at least three brightness steps. The same happens when reducing brighness. During the time (roughly 2 seconds) this happens, mouse is sluggish and all animations (including opengl ones) become jerky. After, everything is normal. Top does not show any process eating CPU. dmesg shows nothing. Other special keys on the laptop (i.e. keyboard brighness, sleep, touchpad off, screenshot) work fine without delays. Also, this may be related (from 2008): http://ubuntuforums.org/showthread.php?t=777947 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-power-manager in Ubuntu. https://bugs.launchpad.net/bugs/847001 Title: Adjusting display brightness is very slow on Dell E5410 with Natty. 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 -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
