On jeu., 2015-04-09 at 09:55 +0200, Thomas Goirand wrote: > On Mon, Mar 30, 2015 at 12:18:20AM +0200, Thomas Goirand wrote: > >> What happens is, if I leave my laptop unused for a (very) long > >> period > >> of time idle, it goes into darkness (slowly fades out, then full > >> screen black). > > > > So something in your desktop environment handles the brightness and > > sets it to minimum? > > Yes, the screen saver.
That's not enough information. Also note that brightness is not DPMS. > > >> When I want to wake-up my latop, I just press any key. This wakes up > >> the laptop, but it does *not* set the screen brightness back to > >> normal. > >> > >> Increasing the brightness on the lightdm password prompt doesn't > >> work. > > > > I assume your laptop needs something in userspace to handle the > > brightness keys, then? > > I believe my mate desktop is somehow handling this. I have no idea about what MATE does, this is purely random guesses here. You might want to investigate more. > > >> However, if I just type my password (blankly, hoping it works...), > >> then I get to X (using the mate Desktop in my case), then brightness > >> control works, and I can see the screen again. > > > >Because MATE handles the brightness keys. > > Yes, and lightdm should as well. I don't think that's the job of a login manager, actually (my opinion is that it was the kernel job, but they disagree). I've forwarded upstream, it's their call anyway. > > >> I believe that the best way to fix it, is to make sure that the > >> brightness controls are *always* working in lightdm. If I get back to > >> lightdm with a black screen, I don't really mind if I can fix that by > >> increasing the brightness... > > > > Sure, but I'm not sure handling the brightness keys are really the > > role of a login screen. I'll forward this upstream but don't hold your > > breath. > > If we can't handle the brightness keys, then just setting-up the > brightness could be a quick and dirty fix-up. Here's a few way to do it > on my laptop: > > # This needs root: > echo 4792 > /sys/class/backlight/intel_backlight/brightness > > # This needs xbacklight to be installed, but this is from userland: > xbacklight -inc 100% And you're back to handling manually everything, adding support for specific graphics cards and what not. Definitely not the role of a login manager. > > Do you know if the above can be set somewhere in the lightdm config as a > hook script or something? If that is for *me* only, this type of hack is > enough (but of course, a more generic / less dirty way to fix things for > everyone else would be better...). See /etc/lightdm/lightdm.conf (you can edit it, or put overrides in /etc/xdg/lightdm/lightdm.conf.d, remember to correctly set the section), for example: # display-setup-script = Script to run when starting a greeter session (runs as root) or: # greeter-setup-script = Script to run when starting a greeter (runs as root) > > >> If I may help to debug the issue in any way, let me know. I'd be > >> happy to do whatever you propose to debug the issue or test some > >> fixes. > > > >It might help to know which kind of laptop it is. > > My laptop is a Lenovo T440p. I have attached the output of dmidecode and > lspci, if that helps. So yes, that's a Windows 8 laptop which needs userspace handling for brightness keys. Regards, -- Yves-Alexis
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