The screen flickering has returned after aptitude upgrading a few days ago. It happens every few minutes.
The upgrade switched to these xserver-xorg packages: xserver-xorg-core 2:1.6.3-1 xserver-xorg-video-intel 2:2.8.0-2 The hardware is a TP T60 with Intel graphics. From lspci: 00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03) -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org