cannot change brightness in Gutsy with thinkpad X61s

Latest gnome-power-manager update fixed this a bit. Now, I'm able to change the level progress bar, although the brightness doesn't change at all. The blinking problem is still there, though.

I have a X61s, the problem with the brightness comes from the fact that the X61s has 16 levels of brightness and this is not well supported for the moment by the ACPI code.

See: http://<email address hidden>/msg00692.html

I'm getting this on my R61 too

I can also verify this on Thinkpad T23. It may be related to a recent ACPI update. There are issues when manipulating /proc/acpi/ibm/brightness directly.

|-/proc/acpi/ibm-|
root@mercury$ cat /proc/acpi/ibm/brightness
level: 2
commands: up, down
commands: level <level> (<level> is 0-7)
|-/proc/acpi/ibm-|
root@mercury$ echo up > /proc/acpi/ibm/brightness
|-/proc/acpi/ibm-|
root@mercury$ cat /proc/acpi/ibm/brightness
level: 0
commands: up, down
commands: level <level> (<level> is 0-7)
|-/proc/acpi/ibm-|
root@mercury$ echo up > /proc/acpi/ibm/brightness
|-/proc/acpi/ibm-|
root@mercury$ cat /proc/acpi/ibm/brightness
level: 1
commands: up, down
commands: level <level> (<level> is 0-7)
|-/proc/acpi/ibm-|
root@mercury$ echo up > /proc/acpi/ibm/brightness
|-/proc/acpi/ibm-|
root@mercury$ cat /proc/acpi/ibm/brightness
level: 2
commands: up, down
commands: level <level> (<level> is 0-7)
|-/proc/acpi/ibm-|
root@mercury$ echo up > /proc/acpi/ibm/brightness
|-/proc/acpi/ibm-|
root@mercury$ cat /proc/acpi/ibm/brightness
level: 1
commands: up, down
commands: level <level> (<level> is 0-7)
|-/proc/acpi/ibm-|
root@mercury$ echo level 7 > /proc/acpi/ibm/brightness
|-/proc/acpi/ibm-|
root@mercury$ cat /proc/acpi/ibm/brightness
level: 7
commands: up, down
commands: level <level> (<level> is 0-7)
|-/proc/acpi/ibm-|
root@mercury$ echo level 7 > /proc/acpi/ibm/brightness
|-/proc/acpi/ibm-|
root@mercury$ echo level 6 > /proc/acpi/ibm/brightness
|-/proc/acpi/ibm-|
root@mercury$ cat /proc/acpi/ibm/brightness
level: 6
commands: up, down
commands: level <level> (<level> is 0-7)
|-/proc/acpi/ibm-|
root@mercury$ echo level 7 > /proc/acpi/ibm/brightness
|-/proc/acpi/ibm-|
root@mercury$ cat /proc/acpi/ibm/brightness
level: 1
commands: up, down
commands: level <level> (<level> is 0-7)

I am assigning this bug to the 'ubuntu-kernel-team' per their bug policy. For future reference you can learn more about their bug policy at https://wiki.ubuntu.com/KernelTeamBugPolicies .

I have an X61s (7669-7DM). In both Gutsy and Hardy (32-bit), I can change the brightness using either the function keys or the gnome panel control.

The brightness does seems to change away from my manually set value after a short delay. I'm not sure if this is specific to my hardware or just a different bug in gnome brightness management.

This is working again with today's hardy updates (Linux lithe 2.6.24-15-generic #1 SMP Fri Apr 4 03:48:31 UTC 2008 i686 GNU/Linux). Thanks!

I confirm, this is working with Hardy Heron.

Beginning with the Hardy Heron 8.04 development cycle, all open Ubuntu kernel bugs need to be reported against the "linux" kernel package. We are automatically migrating this bug to the new "linux" package. However, development has already began for the upcoming Intrepid Ibex 8.10 release. It would be helpful if you could test the upcoming release and verify if this is still an issue - http://www.ubuntu.com/testing . If the issue still exists, please update this report by changing the Status of the "linux" task from "Incomplete" to "New". We appreciate your patience and understanding as we make this transition. Thanks!

The Ubuntu Kernel Team is planning to move to the 2.6.27 kernel for the upcoming Intrepid Ibex 8.10 release. As a result, the kernel team would appreciate it if you could please test this newer 2.6.27 Ubuntu kernel. There are one of two ways you should be able to test:

1) If you are comfortable installing packages on your own, the linux-image-2.6.27-* package is currently available for you to install and test.

--or--

2) The upcoming Alpha5 for Intrepid Ibex 8.10 will contain this newer 2.6.27 Ubuntu kernel. Alpha5 is set to be released Thursday Sept 4. Please watch http://www.ubuntu.com/testing for Alpha5 to be announced. You should then be able to test via a LiveCD.

Please let us know immediately if this newer 2.6.27 kernel resolves the bug reported here or if the issue remains. More importantly, please open a new bug report for each new bug/regression introduced by the 2.6.27 kernel and tag the bug report with 'linux-2.6.27'. Also, please specifically note if the issue does or does not appear in the 2.6.26 kernel. Thanks again, we really appreicate your help and feedback.

As of today's Intrepid, brightness controls are working well with both
the panel applet and keys.

Working for me.

Per a decision made by the Ubuntu Kernel Team, bugs will longer be assigned to the ubuntu-kernel-team in Launchpad as part of the bug triage process. The ubuntu-kernel-team is being unassigned from this bug report. Refer to https://wiki.ubuntu.com/KernelTeamBugPolicies for more information. Thanks.

Moving this from Fix Committed to Fix Released based on comment 11 - https://bugs.edge.launchpad.net/ubuntu/+source/linux/+bug/129913/comments/11

Thanks Leann.

It's still working well in Jaunty.
--
Martin <http://launchpad.net/~mbp/>