Public bug reported: after upgrading to 2.6.27-11-generic (on intrepid) changing the display brightness stopped working on several thinkpad models (x61t, t60 and t500 are mentioned at http://ubuntuforums.org/showthread.php?t=1054247, i use a x61)
when i use the brightness controls the gnome-brightness-bar (or whatever this onscreen indicator is called) pops up and reflects some change, however the displays brightness won't change. same goes for xbacklight or the gnome-brightness-applet. i guess theses were the relevant changes which caused this bug: (from http://launchpadlibrarian.net/20551423/linux_2.6.27-10.20_2.6.27-11.21.diff.gz ) --- linux-2.6.27.orig/drivers/misc/thinkpad_acpi.c +++ linux-2.6.27/drivers/misc/thinkpad_acpi.c @@ -4921,16 +4921,25 @@ */ b = tpacpi_check_std_acpi_brightness_support(); if (b > 0) { - if (thinkpad_id.vendor == PCI_VENDOR_ID_LENOVO) { - printk(TPACPI_NOTICE - "Lenovo BIOS switched to ACPI backlight " - "control mode\n"); - } - if (brightness_enable > 1) { - printk(TPACPI_NOTICE - "standard ACPI backlight interface " - "available, not loading native one...\n"); - return 1; + + if (acpi_video_backlight_support()) { + if (brightness_enable > 1) { + printk(TPACPI_NOTICE + "Standard ACPI backlight interface " + "available, not loading native one.\n"); + return 1; + } else if (brightness_enable == 1) { + printk(TPACPI_NOTICE + "Backlight control force enabled, even if standard " + "ACPI backlight interface is available\n"); + } + } else { + if (brightness_enable > 1) { + printk(TPACPI_NOTICE + "Standard ACPI backlight interface not " + "available, thinkpad_acpi native " + "brightness control enabled\n"); + } } } ProblemType: Bug Architecture: amd64 DistroRelease: Ubuntu 8.10 Package: linux-image-2.6.27-11-generic 2.6.27-11.27 ProcCmdLine: root=UUID=0aaf3329-a880-44fe-a562-92152a53fff0 ro acpi_sleep=s3_bios quiet splash locale=de_DE ProcEnviron: PATH=/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games LANG=de_AT.UTF-8 SHELL=/bin/bash ProcVersionSignature: Ubuntu 2.6.27-11.27-generic SourcePackage: linux ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: apport-bug -- brightness control stopped working after update to linux-2.6.27-11-generic kernel https://bugs.launchpad.net/bugs/325491 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
