I wanna just post an update. In my case, it should have been an issue with the video card driver. My laptop has an Intel integrated video card, as well as a discrete NVIDIA GPU.

$ lspci -vnn | egrep 'VGA|3D'
00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller])
0a:00.0 3D controller [0302]: NVIDIA Corporation Device [10de:1292] (rev a1)

I installed a newer version of the Intel driver, updating package xserver-xorg-video-intel from version 2:2.19.0-6 (wheezy) to 2:2.21.15-2~bpo70+1 (wheezy-backports), and, in my configuration, it seems to have solved the issue.

Cheers


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