On 9/10/19 8:11 PM, Christopher David Howie wrote:
On 9/10/19 4:30 AM, Miroslav Skoric wrote:After upgrading the old laptop from Jessie to Stretch, I noticed that the screensaver in Mate environment does not work for me as before. For example, when the screen goes black after some time of inactivity, for returning back it is not enough just to touch the touchpad or press any key. Instead, pressing any key or touching the touchpad makes the screen just some 1% lighter than the full black (or better to say, it remains 99% black). However, the last working GUI does not return.I have this same issue with the default configuration of XFCE on Buster, where the problem was not present on Stretch.
Hi Chris,Well, I noticed that issue after I recently upgraded to Stretch, but not had it in Jessie. Whatever. Having in mind that Stretch is oldstable for a while, and you had the issue in Buster, it seems that the issue goes through the versions intact :-)
Is light-locker installed, and do you use lightdm? light-locker appears to be the source of this issue. Googling "light-locker black screen" returns dozens of posts across many sites complaining about the same problem.
Yes, light-locker was installed, and as soon as I removed it the problem disappeared. By the way, lightdm is still there, however I am unsure about the display manager in current use because it is the system that started initially from Squeeze several years ago, and included Gnome, KDE, LXDE, and XFCE (and I added MATE in Wheezy I think). Before the last dist-upgrade I removed KDE because I used it at least.
I resolved this issue by removing light-locker and installing xscreensaver instead. Note that this required removing a few metapackages, and then marking the dependent packages that I wanted to keep as manually installed to prevent apt from removing most of my desktop tools.
Well, in trying solution for this issue, I removed xscreensaver yesterday. So it disappeared from MATE's menu System > Preferences > ... but that did not solve the problem.
Nevertheless now I only have one instance of screensaver preferences in MATE's System > Preferences > Look and Feel > Screensaver. It works well for now. I'll observe its behaviour, and report again if it is not good.
Thank you for help! Misko