https://bugzilla.kernel.org/show_bug.cgi?id=59651
URL: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1
069144
Summary: [Toshiba Satellite R830] brightness control works
until sleep
Product: ACPI
Version: 2.5
Kernel Version: 3.10.0-031000rc5-generic_3.10.0-031000rc5.201306082135
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: low
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Created an attachment (id=104511)
--> (https://bugzilla.kernel.org/attachment.cgi?id=104511)
Test results as requested by the Kernel testing wiki.
On my Toshiba Satellite R830, I have 13.04 AMD64. The Fn + F6, Fn + F7 buttons
reduce/increase the brightness level of the screen. The issue is that they stop
working after waking my computer from sleep. When this happens I cannot even
control brightness by going to "System Settings/Brightness and Lock". I had
Ubuntu 12.04 and 12.10 installed before and I had the same identical problem.
On 12.04 and 12.10 the fommowing solved the problem:
WORKAROUND: I modified /etc/default/grub changing the line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
Then updated grub with:
sudo update-grub
and the problem was solved.
These values are not between 0 and 7 (as the ones in the other directory), but
between 284 and 4539, or something like that. Source is
http://askubuntu.com/a/196863/27968.
WORKAROUND: In Raring:
echo 400 | sudo tee /sys/class/backlight/intel_backlight/brightness
http://www.toshiba.co.uk/innovation/download_bios.jsp?service=UK
Sent an e-mail upstream to:
http://marc.info/?l=linux-acpi&m=136975088406475&w=2
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