--- Please enter the report below this line. ---
after some time doing nothing on my laptop, screen flickers. (about
every minute)

Xorg.0.log shows this

[  1485.119] (II) PM Event received: Capability Changed
[  1485.125] (II) PM Event received: Capability Changed
[  1485.186] (II) fglrx(0): EDID vendor "LEN", prod id 16560
[  1485.186] (II) fglrx(0): Printing DDC gathered Modelines:
[  1485.186] (II) fglrx(0): Modeline "1366x768"x0.0   73.30  1366 1382
1398 1550  768 771 785 788 -hsync -vsync (47.3 kHz eP)
[  1485.186] (II) fglrx(0): Modeline "1366x768"x0.0   61.08  1366 1382
1398 1550  768 771 785 788 -hsync -vsync (39.4 kHz e)

this happened with gnu driver for my graphics chip and also with fglrx.
my machine is a thinkpad edge e535.


Debian Release: 7.1
500 stable-updates ftp2.de.debian.org
500 stable security.debian.org
500 stable ftp.de.debian.org
500 stable dl.google.com
--- Package information. ---
Depends (Version) | Installed
================================================-+-====================
xserver-xorg (>= 1:7.7+3~deb7u1) | 1:7.7+3~deb7u1
libgl1-mesa-glx | 8.0.5-4+deb7u2
OR libgl1 |
libgl1-mesa-dri | 8.0.5-4+deb7u2
libglu1-mesa | 8.0.5-4+deb7u2
xfonts-base (>= 1:1.0.0-1) | 1:1.0.3
xfonts-100dpi (>= 1:1.0.0-1) | 1:1.0.3
xfonts-75dpi (>= 1:1.0.0-1) | 1:1.0.3
xfonts-scalable (>= 1:1.0.0-1) | 1:1.0.3-1
x11-apps | 7.7~2
x11-session-utils | 7.6+2
x11-utils | 7.7~1
x11-xfs-utils | 7.7~1
x11-xkb-utils | 7.7~1
x11-xserver-utils | 7.7~3
xauth | 1:1.0.7-1
xinit | 1.3.2-1
xfonts-utils | 1:7.7~1
xkb-data | 2.5.1-3
xorg-docs-core | 1:1.6-1
xterm | 278-4
OR x-terminal-emulator |
xserver-xorg-core (>= 2:1.11) | 2:1.12.4-6
xserver-xorg-video-all | 1:7.7+3~deb7u1
OR xorg-driver-video |
xserver-xorg-input-all | 1:7.7+3~deb7u1
OR xorg-driver-input |
xserver-xorg-input-evdev | 1:2.7.0-1+b1
libc6 (>= 2.7) | 2.13-38
xkb-data (>= 1.4) | 2.5.1-3
x11-xkb-utils | 7.7~1


Recommends (Version) | Installed
==============================-+-===========
libgl1-mesa-dri | 8.0.5-4+deb7u2


Suggests (Version) | Installed
========================-+-===========
xorg-docs |