Brightness Keys do not work on Lenovo U350

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 401591, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

Bug 401591 has supposedly been fixed, but it is still broken on the U350. Therefore, this doesn't seem to be a duplicate.

> It is resolved for acer 5715z. You can open another bug. Or change the name of this one maybe?
Bye, Nicola (from bug 40159)

I guess, the bug status should be changed. It is not a duplicate. I need info and fix about FN keys not working on Karmic, Lenovo U350

The bug is not a duplicate. The problem is fixed for acer 5715z but the keys are not working with my Lenovo u350.

I am also confirming this bug on my Lenovo u350.

I'm also seeing this problem. I get this in my dmesg
ACPI: Failed to switch the brightness

This is my temporary hack for getting the keys working:
http://github.com/zaius/bright

It's definitely not perfect. Especially since the laptop can't put the screen to sleep after an idle time. But I don't even know where to start to fix ACPI problems.

The default brightness can also be set by using the fn-brightness keys while in the bios.

folks,
     Please test this against the latest live image of Lucid: http://cdimage.ubuntu.com/daily-live/current/
I'm interested to know if this is still an issue in the latest development version.

Thanks!

~JFo

I tried it today, with the daily build of 3 April 2010. It did not work.

E.

I tried it today, with the daily build of Ubuntu and Kubuntu. The feature still doesn't work.

This seems to fix the problem:

http://brettshaffer.com/blog/linux/fix-ubuntu-screen-brightness-problem/comment-page-1/

i have the same problem.

- after installation of lucid beta1 brightness-notification was shown but the brightness actually did not change.
- then i used emil kalvelands link to fix the problem
- however since an update one or two weeks ago the problem is back and can't be solved with kalveland's link

ok works for me now.

edited /etc/default/grub

from

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=video"
GRUB_CMDLINE_LINUX="nomodeset acpi_backlight=video"

acpi_backlight=vendor as suggested in kalvelands link didn't work for me.

#12 worked for me as well.

This bug report was marked as Incomplete and has not had any updated comments for quite some time. As a result this bug is being closed. Please reopen if this is still an issue in the current Ubuntu release http://www.ubuntu.com/getubuntu/download . Also, please be sure to provide any requested information that may have been missing. To reopen the bug, click on the current status under the Status column and change the status back to "New". Thanks.

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This is still an issue for me... The solutions provided in #6 and #12 both work for me except I get a kernel panic (flashing caps/scroll) on wake from sleep. The keys do not work in the maverick beta either, but I can't check the sleep issue since a clean install already crashes on sleep and/or wake.

Edit: I meant posts #10 and #12...

Same issue on Lenovo U350, all the option listed below doesn't work on Kubuntu 10.10 on the last kernel 2.6.36-020636rc7-generic.

mattubu / Elringer,
     Please open new bugs for your particular issues. Please also refrain from reopening expired or closed issues unless you are the original reporter.

Thanks!

~JFo