I found some sort of clue. Updating the system through aptitude I once got this error:
setterm: cannot (un)set powersave mode: Inappropriate ioctl for device I do not know what package was concerned (updated quite a few). Maybe it is not a problem of gnome after all. I tried searching google but people complained about this error on servers and they wanted to disable power management completely. This is not my case, however so just adding acpi=off to the boot command will not do. In any case shouldn't gnome power manager at least say something in .xsessionerrors if it encounters a problem setting powermanagement settings? Gennady On Mon, 2013-10-14 at 15:00 -0400, Emilio Pozuelo Monfort wrote: > On 14/10/13 13:10, Gennady Uraltsev wrote: > > Package: gnome-power-manager > > Version: 3.8.2-1 > > Severity: important > > > > Dear developers, > > > > Starting from some time ago I noticed that my Gnome 3 thinks that I am > > on battery even when I am on AC. In particular it brightens down my > > screen and sleeps the laptop (Thinkpad W520) after some time of > > inactivity even though these settings are enabled (through dconf) only > > for battery powered operation. This worked some time ago (several weeks) > > and got broke at some point (I cannot pin down when since it took some > > time to notice). > > What does `acpi' say when gnome thinks you're on battery while you're not?
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