P.J.Lin: >"Two questions : 1. For all other platform (Intel Shark Bar or former >chipset), we did not add "acpi_backlight=vendor" to the GRUB command line and >the LCD backlight brightness function still works. Only Intel Bay Trail-M >platform has this problem, why?"
This is a great question. Unfortunately, I'm not a kernel developer, so I don't have deeper insight on this. However, in order to get this fixed so you wouldn't have to use the kernel parameter, it would be best to report this upstream through the appropriate channel by following the instructions at https://wiki.ubuntu.com/Bugs/Upstream/kernel . I would start with the linux-acpi mailing list. Please provide a direct URL to your e-mail to the mailing list once you have made it so that it may be tracked. >"2. Does next formal release of Ubuntu 14.04 on next month include the kernel 3.13.3-031303-generic?" Consulting http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-trusty.git;a=shortlog the current Trusty kernel has been rebased against upstream mainline kernel v3.13.6 (3.13.6-031306): http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13.6-trusty/ ** Changed in: linux (Ubuntu) Status: Confirmed => Triaged -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1279282 Title: There are no LCD backlight brightness function and OSD with Fn hot keys under Ubuntu 13.10. Status in “linux” package in Ubuntu: Triaged Bug description: Steps to reproduce: #1. Install Ubuntu 13.10 x64 #2. Change OS indication. $ sudo gedit /etc/default/grub Find GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" Change to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_os_name=Linux acpi_osi=" $ sudo update-grub (Reboot) #3.Press hot key Fn+F8 or Fn+F9. More information: Our BIOS engineer had already checked the ACPI ASL code and all the necessary event notifications are normally notified as expected while Fn hot key pressed. But this issue is still there. We think there is no Intel graphics driver in Ubuntu 13.10. That's why we need it. There is no problem for all our Shark Bay models with the same ASL event notification under Ubuntu 13.10. WORKAROUND: LCD backlight brightness function works after adding to GRUB command line: acpi_backlight=vendor --- ApportVersion: 2.12.5-0ubuntu2.2 Architecture: amd64 DistroRelease: Ubuntu 13.10 InstallationDate: Installed on 2014-01-09 (47 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MarkForUpload: True Package: linux (not installed) Tags: saucy Uname: Linux 3.13.3-031303-generic x86_64 UnreportableReason: The running kernel is not an Ubuntu kernel UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo --- ApportVersion: 2.12.5-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: clevo 1814 F.... pulseaudio DistroRelease: Ubuntu 13.10 HibernationDevice: RESUME=UUID=223d0897-5f92-40af-874c-05f18ee70f8a InstallationDate: Installed on 2014-03-03 (0 days ago) InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1) MachineType: Notebook W54XTU MarkForUpload: True Package: linux (not installed) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic.efi.signed root=UUID=138fbaf1-adbf-42a3-a04f-99be36d38dab ro quiet splash acpi_os_name=Linux acpi_osi= vt.handoff=7 ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3 RelatedPackageVersions: linux-restricted-modules-3.11.0-12-generic N/A linux-backports-modules-3.11.0-12-generic N/A linux-firmware 1.116 Tags: saucy Uname: Linux 3.11.0-12-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo dmi.bios.date: 01/21/2014 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 5.6.5 dmi.board.asset.tag: Tag 12345 dmi.board.name: W54XTU dmi.board.vendor: Notebook dmi.board.version: V1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 11 dmi.chassis.vendor: Notebook dmi.chassis.version: N/A dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr5.6.5:bd01/21/2014:svnNotebook:pnW54XTU:pvrNotApplicable:rvnNotebook:rnW54XTU:rvrV1.0:cvnNotebook:ct11:cvrN/A: dmi.product.name: W54XTU dmi.product.version: Not Applicable dmi.sys.vendor: Notebook To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1279282/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
