-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On Mon, Mar 30, 2015 at 12:18:20AM +0200, Thomas Goirand wrote: > Hi Yves-Alexis, > > I have experienced the same issue as described by Fabien. > > 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? > 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. Ok. > > 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? > 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. > > Before I knew this trick, I thought my laptop was crashed. So I just powered > off, then on again. But then when lightdm gets back, it sets the brightness > to zero again (meaning screen is off in my case), and I can see nothing. The > only way is again, to type my login and password blanking (without any > control to see if I typed correctly), then when X start, I can set the > brightness again. > > I can confirm that the issue is in lightdm, because gdm doesn't have this > issue. I'm also using systemd. I'm using the Nouveau driver (and probably > also the intel i915 since my laptop has 2 cards). I'm not sure this is > related to video board and driver, but I thought it was a good info. It's somehow related yeah. Brightness keys handling has been a mess these past years. It was once handled completely by the laptops embedded controller, then it was done by the kernel/ACPI, then by the driver, then by basically noone (since Windows 8 laptops), so it has to be done in userspace. > > 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 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. Regards, - -- Yves-Alexis -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCgAGBQJVGQetAAoJEG3bU/KmdcClhGQH/1DyjXmIlpjkPS2JEWVPaTy7 0naSLdQn/kGj2U3Uv+tMAIaQaeekG0vgsI9R/f4ibG59BB7ywYx/3e5VWvLqXSDc HD3uREqxF6s2EYf+XSib4tY+hVj+QP+f6zhd4OglPCqlnluY316neIft1ck7Hz8f k5a0NjyGnjFZyqKtNPoWrp9Q54FW04vYXxJ1anzRvDb7goOlt8ThKXV7feJfMMRK a2lqdyYQPjMFxusNr+yYvwQB/8SOk4JKvUwFrNDQsQOD0Bm5gFT/jQDqUM0tns4k ukugms7gl1YIhs1SAvYicJQBxkLDO2QOoTf/RqI1FpYblwT4EJVLArBVhoKi5FU= =+8JX -----END PGP SIGNATURE----- -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org