Hello, i have the same problem. Is a fix known?
I could test a upstream kernel, if it's needed. --- Hardware: Dell Inspiron 15r SE with: - Processor : Intel Core i5-3210M (2.50 GHz, 3M cache) - Display : 15.6in Full High Definition (1080p) WLED with AntiGlare - Memory : 6144MB (1x2048 + 1x4096) 1600MHz DDR3 - Hard Drive: 128 GB ADATA SSD 600 - Optical Drive : 8x DVD+/-RW Optical Drive - Graphics : 2GB AMD Radeon HD 7730M - Wireless : Intel 2230 WLAN Card (802.11n + BT 4.0) -> The notebook has two graphic cards. --- DMSEG: [ 5.033822] [Firmware Bug]: ACPI(PEGP) defines _DOD but not _DOS [ 5.056586] init: alsa-restore main process (1002) terminated with status 19 [ 5.064643] acpi device:2e: registered as cooling_device4 [ 5.065514] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2c/LNXVIDEO:00/input/input9 [ 5.065617] ACPI: Video Device [PEGP] (multi-head: yes rom: no post: no) [ 5.065631] [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA controller, please try module parameter "video.allow_duplicates=1"if the current driver doesn't work. [ 5.070380] ACPI Error: Current brightness invalid (20110623/video-384) [ 5.071258] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:02/input/input10 [ 5.071383] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no) Thanks ** Attachment added: "hardwareInfo.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/995456/+attachment/3431523/+files/hardwareInfo.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/995456 Title: Duplicate ACPI video bus devices for the same VGA controller To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/995456/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
