Hi, I improved the /etc/udev/rules.d/tosh-backlight.sh script as presented in https://bugs.launchpad.net/ubuntu/+source/linux/+bug/935778/comments/68, this script avoids the no-backlight at all issue and sets the brightness using a quadratic function (it works much better in my Z830 where the lower brightness jumps are very big).
#!/bin/sh acpi_max=$(cat /sys/class/backlight/toshiba/max_brightness) acpi_curr=$(cat /sys/class/backlight/toshiba/brightness) intel_max=$(cat /sys/class/backlight/intel_backlight/max_brightness) intel_min=100 # What we want the brightness 0 to be # Linear #intel_curr=$((($intel_max-$intel_min)/$acpi_max*$acpi_curr+$intel_min)) # Cuadratic intel_curr=$(echo "scale=10; ($intel_max-$intel_min)/($acpi_max^2)*$acpi_curr^2+$intel_min" | bc | cut -d. -f1) echo $intel_curr > /sys/class/backlight/intel_backlight/brightness -- 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/935778 Title: Toshiba Tecra R840 - brightness controls work on first boot, but do nothing after suspend/resume Status in The Linux Kernel: Confirmed Status in “linux” package in Ubuntu: Incomplete Status in Debian GNU/Linux: Confirmed Status in Fedora: Unknown Status in openSUSE: Confirmed Bug description: Overview - This bug affects many Toshiba laptops including R700, R705, R800, R830, R835, R840, R850, Z930 models - please update this description if your model is also affected, but make sure the symptoms match exactly. The symptoms are that brightness control operates normally when the system is first booted, but after a suspend-to-RAM and resume cycle the brightness controls have no effect. After a normal reboot, or hibernate & resume cycle, the brightness controls operate normally again. This bug is tracked for the kernel at: http://bugzilla.kernel.org/show_bug.cgi?id=21012 And for Debian at: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=599768 Please try to keep all info together and pass any progress to the upstream trackers. Original report for #935778 follows: On my Toshiba R840, the brightness controls work fine on first boot, but do nothing after suspend/resume. This is particularly frustrating if I suspend with the screen at all dimmed, because once I resume, I have no way of increasing the brightness short of a reboot. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: linux-image-generic 3.2.0.16.16 ProcVersionSignature: Ubuntu 3.2.0-16.25-generic 3.2.6 Uname: Linux 3.2.0-16-generic x86_64 AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 1.91-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: james 2251 F.... pulseaudio /dev/snd/pcmC0D0p: james 2251 F...m pulseaudio CRDA: country EU: (2402 - 2482 @ 40), (N/A, 20) (5170 - 5250 @ 40), (N/A, 20) (5250 - 5330 @ 40), (N/A, 20), DFS (5490 - 5710 @ 40), (N/A, 27), DFS Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xc4820000 irq 50' Mixer name : 'Intel CougarPoint HDMI' Components : 'HDA:10ec0269,1179062a,00100100 HDA:80862805,11790001,00100000' Controls : 30 Simple ctrls : 12 Date: Sat Feb 18 21:27:12 2012 EcryptfsInUse: Yes InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012) MachineType: TOSHIBA TECRA R840 ProcEnviron: LANGUAGE=en_GB:en PATH=(custom, no user) LANG=en_GB.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-16-generic root=UUID=16b08eff-30c4-4fe0-bede-cf8cb31270bf ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.2.0-16-generic N/A linux-backports-modules-3.2.0-16-generic N/A linux-firmware 1.69 RfKill: 0: phy0: Wireless LAN Soft blocked: no Hard blocked: no SourcePackage: linux StagingDrivers: mei UpgradeStatus: Upgraded to precise on 2012-01-09 (39 days ago) dmi.bios.date: 07/12/2011 dmi.bios.vendor: TOSHIBA dmi.bios.version: Version 2.90 dmi.board.asset.tag: 0000000000 dmi.board.name: Portable PC dmi.board.vendor: TOSHIBA dmi.board.version: Version A0 dmi.chassis.asset.tag: 0000000000 dmi.chassis.type: 10 dmi.chassis.vendor: TOSHIBA dmi.chassis.version: Version 1.0 dmi.modalias: dmi:bvnTOSHIBA:bvrVersion2.90:bd07/12/2011:svnTOSHIBA:pnTECRAR840:pvrPT42GE-00N006EN:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0: dmi.product.name: TECRA R840 dmi.product.version: PT42GE-00N006EN dmi.sys.vendor: TOSHIBA To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/935778/+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
