So there is a notebook that has Scientific Linux 6.3 installed with GNOME 2.
If we don't press any button on the keyboard or move the mouse, the screen of it turns black.
But: if we move the mouse/hit a button when the screen of it went black.. it still stays black.. it's not a hardware problem, it's a problem related to the OS. I didn't find any energy saving options for this in the BIOS.
If the screen is black, we can slightly see that the OS is still running, but it's very-very-very dark..
The only solution is to press the power-on button for 5 seconds to turn the machine off..
Any solutions/settings? Please halp.
UPDATE#1: (I can only rarely get to this notebook, that's why I can only answer rarely, sorry) So I found a settings in gnome-screensaver-preferences: "Activate screensaver when computer is idle" was enabled. I disabled it, and we are waiting for the blank screen to appear again, but this takes time, because I found out that the screen goes to blank randomly (!). Even if there was somebody in front of the notebook and was using the ex.: USB mouse.. strange.. I will update the Q/accept the good answer if this helps:D
UPDATE#2: Until the outcome the xset -q output is this:
[root@HOSTNAME ~]# xset -q
Keyboard Control:
auto repeat: on key click percent: 0 LED mask: 00000000
XKB indicators:
00: Caps Lock: off 01: Num Lock: off 02: Scroll Lock: off
03: Compose: off 04: Kana: off 05: Sleep: off
06: Suspend: off 07: Mute: off 08: Misc: off
09: Mail: off 10: Charging: off 11: Shift Lock: off
12: Group 2: off 13: Mouse Keys: off
auto repeat delay: 500 repeat rate: 30
auto repeating keys: 00ffffffdffffbbf
fadfffefffedffff
9fffffffffffffff
fff7ffffffffffff
bell percent: 50 bell pitch: 400 bell duration: 100
Pointer Control:
acceleration: 2/1 threshold: 4
Screen Saver:
prefer blanking: yes allow exposures: yes
timeout: 0 cycle: 0
Colors:
default colormap: 0x20 BlackPixel: 0 WhitePixel: 16777215
Font Path:
catalogue:/etc/X11/fontpath.d,built-ins
DPMS (Energy Star):
Standby: 0 Suspend: 0 Off: 0
DPMS is Enabled
Monitor is On
[root@HOSTNAME ~]#
echo 10 > /sys/class/backlight/acpi_video0/brightness
does something (then the problem might be cornered)