Public bug reported: Some new laptops such as this Acer Travelmate 8371G (Timeline) have two graphics adapters (Intel 4500MHD and ATI HD 4330). There are two BIOS settings: "Switchable graphics" and "Discrete graphics". With the latter option, only the ATI GPU is in use, but with the former option, *both* GPUs are powered on by default. Neither of these options is good for battery runtime.
Fortunately, someone has found a solution that turns off the discrete GPU in the switchable mode. It's a simple kernel module called "lenovo_acpi" that calls the ACPI BIOS: http://georgia.ubuntuforums.org/showthread.php?p=7933876#post7933876 It was originally made for Lenovo U330, in that thread it's reported to work on Acer Aspire 4810TG (Timeline) and Acer Aspire 5810TG (Timeline). On the 8371G here, "Switchable graphics" originally gave some 2 hours of battery use, "Discrete graphics" gives some 3 hours of battery use, and "Switchable graphics" with this module loaded gives some 4 hours of battery use. The module doesn't re-apply the fix after resume from hibernate, so I've had to list it in the pm-utils SUSPEND_MODULES variable. ProblemType: Bug Architecture: i386 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: Intel [HDA Intel], device 0: ALC269 Analog [ALC269 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: tuukka 1878 F.... pulseaudio CRDA: Error: [Errno 2] Tiedostoa tai hakemistoa ei ole Card0.Amixer.info: Card hw:0 'Intel'/'HDA Intel at 0xf4500000 irq 22' Mixer name : 'Realtek ALC269' Components : 'HDA:10ec0269,10250284,00100004' Controls : 21 Simple ctrls : 12 Date: Thu Sep 24 16:28:44 2009 DistroRelease: Ubuntu 9.10 HibernationDevice: RESUME=UUID=3a0cc818-d22b-4df4-9947-61373f45494c MachineType: Acer TravelMate 8371 Package: linux-image-2.6.31-10-generic 2.6.31-10.35 ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.31-10-generic root=UUID=58fdc759-1719-40df-b6b6-1902991b8bba ro quiet splash ProcEnviron: PATH=(custom, user) LANG=fi_FI.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 2.6.31-10.35-generic RelatedPackageVersions: linux-backports-modules-2.6.31-10-generic N/A linux-firmware 1.19 SourcePackage: linux Uname: Linux 2.6.31-10-generic i686 dmi.bios.date: 08/05/2009 dmi.bios.vendor: Acer dmi.bios.version: V1.11 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: TravelMate 8371 dmi.board.vendor: Acer dmi.board.version: PSMBOU-1234567 dmi.chassis.asset.tag: None dmi.chassis.type: 10 dmi.chassis.vendor: Acer dmi.chassis.version: None dmi.modalias: dmi:bvnAcer:bvrV1.11:bd08/05/2009:svnAcer:pnTravelMate8371:pvrV1.11:rvnAcer:rnTravelMate8371:rvrPSMBOU-1234567:cvnAcer:ct10:cvrNone: dmi.product.name: TravelMate 8371 dmi.product.version: V1.11 dmi.sys.vendor: Acer ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug i386 -- need to turn off extra "Switchable graphics" GPU https://bugs.launchpad.net/bugs/435906 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
