Brightness keeps resetting to max [Gutsy]

Bug #162633 reported by Andrew Henry on 2007-11-14
Affects Status Importance Assigned to Milestone

Bug Description

I just upgraded a HP Pavilion dv9297ea from Feisty to Ubuntu Gutsy amd64 yesterday. Using nVidia proprietary drivers from the repos. Since upgrading, there seems to be more controls for controlling the brightness depending on whether im using AC or battery. I had the AC plugged in all the time and I manually lowered the brightness to under 50% but the brightness kept resetting to max.

It seems to be triggered by something, like using certain apps. I did not test thoroughly enough, so maybe I should leave system running without using it to see if it resets. It does not reset immediately, but it happened to me 4 or 5 times during one hour of using my laptop.

muszek (muszek) wrote :

I've noticed that right after I installed gutsy and kinda know how it "works" now.

It doesn't reset to 100%, it resets to the value of "set display brightness to" slider in "on ac power" (even if currently running on battery!) tab of Power Management Preferences applet. It always happens after a few minutes from setting it with a "Fn+brightness" key. One thing that always trigges this is opening Power Management Preferences applet.

Workaround is simple: adjust your brightness using this slider and not the key combo. I started doing that some time ago and it's not that annoying.

muszek (muszek) wrote :

Just in case there's confusion: take a look at the attachment - it's the slider that's set to 80%.

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