You have been subscribed to a public bug: On UL30A Bios 212 in Oneiric Ocelot the backlight turns off as expected, but on resume the backup does not come up again, until the laptop has finished a (sw)suspend and wakeup cycle. After that the backlight works again until it blacks out again on predefinied timeout. (see additional information)
This bug is definitely reproducible. Switching the backlight brightness level from the console using sudo setpci -s 00:02.0 F4.B=00 sudo setpci -s 00:02.0 F4.B=ff works well. It may be a scripting issue. additional information: While the screen is switched off and backlight is off, no key or key combination will help but FN+F1 (sleep). The same applies for a lid close, if configured. Neither setting FN+F5, nor FN+F6 nor FN+F7 nor FN+F8 nor FN+Space will switch the backlight on again. If you use an external light, you can see shadows of the screen content, so it is definitely a backlight issue. Using Ubuntu kernel 3.0.0-12-generic, with tuxonice ppa (does not mak a difference) and kernel options as follows: acpi_os_name=Linux acpi_backlight=vendor dmesg reports: [164260.055928] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored This occurs despite acpidump reports ... [._OSIa.._O 02e0: 53 49 0d 57 69 6e 64 6f 77 73 20 32 30 30 30 00 SI.Windows 2000. 02f0: 70 0a 04 4f 53 56 52 a0 19 5f 4f 53 49 0d 57 69 p..OSVR.._OSI.Wi 0300: 6e 64 6f 77 73 20 32 30 30 31 00 70 00 4f 53 56 ndows 2001.p.OSV 0310: 52 a0 1d 5f 4f 53 49 0d 57 69 6e 64 6f 77 73 20 R.._OSI.Windows 0320: 32 30 30 31 20 53 50 31 00 70 00 4f 53 56 52 a0 2001 SP1.p.OSVR. 0330: 1d 5f 4f 53 49 0d 57 69 6e 64 6f 77 73 20 32 30 ._OSI.Windows 20 0340: 30 31 20 53 50 32 00 70 00 4f 53 56 52 a0 1b 5f 01 SP2.p.OSVR.._ 0350: 4f 53 49 0d 57 69 6e 64 6f 77 73 20 32 30 30 31 OSI.Windows 2001 0360: 2e 31 00 70 00 4f 53 56 52 a0 1f 5f 4f 53 49 0d .1.p.OSVR.._OSI. 0370: 57 69 6e 64 6f 77 73 20 32 30 30 31 2e 31 20 53 Windows 2001.1 S 0380: 50 31 00 70 00 4f 53 56 52 a0 19 5f 4f 53 49 0d P1.p.OSVR.._OSI. 0390: 57 69 6e 64 6f 77 73 20 32 30 30 36 00 70 00 4f Windows 2006.p.O 03a0: 53 56 52 a1 4e 07 a0 26 4d 43 54 48 5f 4f 53 5f SVR.N..&MCTH_OS_ 03b0: 0d 4d 69 63 72 6f 73 6f 66 74 20 57 69 6e 64 6f .Microsoft Windo 03c0: 77 73 20 4e 54 00 70 0a 04 4f 53 56 52 a1 44 05 ws NT.p..OSVR.D. 03d0: a0 39 4d 43 54 48 5f 4f 53 5f 0d 4d 69 63 72 6f .9MCTH_OS_.Micro 03e0: 73 6f 66 74 20 57 69 6e 64 6f 77 73 4d 45 3a 20 soft WindowsME: 03f0: 4d 69 6c 6c 65 6e 6e 69 75 6d 20 45 64 69 74 69 Millennium Editi 0400: 6f 6e 00 70 0a 02 4f 53 56 52 a0 17 4d 43 54 48 on.p..OSVR..MCTH 0410: 5f 4f 53 5f 0d 4c 69 6e 75 78 00 70 0a 03 4f 53 _OS_.Linux.p..OS 0420: 56 52 a4 4f 53 56 52 14 4e 04 4d 43 54 48 02 a0 VR.OSVR.N.MCTH.. ... Using no acpi_backlight option will result in inusable or erratic behaviour of function key combinations. May be related to bug: #800625, #741223, #756938 ** Affects: gnome-power-manager (Ubuntu) Importance: Undecided Status: New ** Tags: asus backlight ul30a -- Asus UL30A backlight malfunction on screen off/wakeup https://bugs.launchpad.net/bugs/884717 You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-power-manager in Ubuntu. -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp