[lucid] brightness keeps getting decreased while non-idle

[steltenpower]

I just increased brightness to maximum and then a few seconds later (while heavily typing on my machine) ubuntu lowers it again.

[steltenpower (ubuntu-steltenpower)]

I'm on a Ahtec Sense XMS 1719

[Dimitrios Symeonidis (azimout)]

could it be your power management settings?

[Marc Carter (drekbour)]

This affects me too (8.10, thinkpad x60) and has been a pain for a long time now (certainly was present in Hardy, can't remember back to Gutsy). Experimentation shows two distinct problems.

a) "on battery power" -> "reduce backlight brightness" When selected this sets the normal brightness to 50% but doesn't actually stop the user from pumping it back to 100%. Occasionally I presume the power management daemon notices (to force this close and reopen the power console) and sets it back in a most frustrating way. If (and I think we should) we allow users to boost the brightness above the cap then this reset should be done during a video power event (screen off, idle etc) and not simply enforced every time something is randomly polled.

ref #136693 for related fixes done in the area of auto/manual brightness that may not have been fully thought through.

b) "idle detection" clearly isn't working (as described by the OP). Right now (on AC and clearly not idle) I can choose "dim display when idle" and it _immediately_ sets the display to 25%. Again, I can boost the brightness but it will "notice" and reset it.

[Victor Vargas (kamus)]

Since this report have a long time without activity, could you check (if is possible) in latest version included in Karmic if this issue is still happening? Thanks in advance.

[Marc Carter (drekbour)]

same hardware on Karmic. Issue (a) still evident although this is a trivial item. issue (b) seems to have been fixed.

[xteejx (xteejx-deactivatedaccount)]

I can confirm this. Setting brightness to a set level, with the "reduce backlight when idle" setting on, reduces the backlight, but when the mouse is moved again, does not return to the manually set light level.

[xteejx (xteejx-deactivatedaccount)]

Architecture: i386
CheckboxSubmission: 49c3c74c783323aedd48e2bbf8c468de
CheckboxSystem: 2e4ab5fb96eeb897d439b8ef1239668e
DistroRelease: Ubuntu 10.04
NonfreeKernelModules: nvidia
Package: gnome-power-manager 2.28.1-0ubuntu3
PackageArchitecture: i386
ProcEnviron:
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-10.14-generic
Tags: lucid
Uname: Linux 2.6.32-10-generic i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[xteejx (xteejx-deactivatedaccount)]

apport information

[xteejx (xteejx-deactivatedaccount)]

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[xteejx (xteejx-deactivatedaccount)]

apport information

[xteejx (xteejx-deactivatedaccount)]

apport information

[xteejx (xteejx-deactivatedaccount)]

Marking Triaged.
Thanks for reporting this bug and any supporting documentation. Since this bug has enough information provided for a developer to begin work, I'm going to mark it as confirmed and let them handle it from here. Thanks for taking the time to make Ubuntu better!