InstallationMedia: Ubuntu 12.04.1 LTS 'Precise Pangolin' - Release amd64 (20120823.1) **** List of CAPTURE Hardware Devices ****Ĭard 0: PCH, device 0: ALC269VB Analog ProcVersionSign ature: Ubuntu 3.2.0-32.51-generic 3.2.30ĪlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. co.uk/innovatio n/download_ bios.jsp? service= UK Įcho 400 | sudo tee /sys/class/ backlight/ intel_backlight /brightness These values are not between 0 and 7 (as the ones in the other directory), but between 2, or something like that.

For instance:Įcho 2937 > /sys/class/ backlight/ intel_backlight /brightnessĮcho 300 | sudo tee /sys/class/ backlight/ intel_backlight /brightness > /dev/null

WORKAROUND: As root (not with sudo but actually changing user: su root), change the value in sys/class/ backlight/ intel_backlight /brightness. GRUB_CMDLINE_ LINUX_DEFAULT= 'quiet splash acpi_osi=Linux acpi_backlight= vendor' GRUB_CMDLINE_ LINUX_DEFAULT= 'quiet splash' WORKAROUND: I modified /etc/default/grub changing the line: Now I installed the upstream kernel 3.7rc5 and the situation is even worse, because on wakeup, the brightness is at 100% whereas on the standard kernel it remembers the brightness value. I had Ubuntu 12.04 installed before and I had the same identical problem. When this happens I cannot even control brightness by going to 'System Settings/Brightness and Lock'. The issue is that they stop working after waking my computer from sleep.

The Fn + F6, Fn + F7 buttons reduce/increase the brightness level of the screen. On my Toshiba Satellite R830, I have 12.10 AMD64.

Toshiba r830 ahci