> The X server may need a little more explicit configuration: Thanks, that sounded like a good idea.
But it didn't work either for a new size or even when I give a size which was the same as the default size: $ cat /etc/X11/xorg.conf Section "Screen" Identifier "TarskTripleTrouble" SubSection "Display" Virtual 8192 8192 EndSubSection EndSection The server fails to come up, with the tail of ~/.local/share/xorg/Xorg.0.log reading [ 621.616] (II) modeset(0): Using default gamma of (1.0, 1.0, 1.0) unless otherwise stated. [ 621.616] (==) modeset(0): DPI set to (96, 96) [ 621.616] (II) Loading sub module "fb" [ 621.616] (II) LoadModule: "fb" [ 621.616] (II) Loading /usr/lib/xorg/modules/libfb.so [ 621.616] (II) Module fb: vendor="X.Org Foundation" [ 621.616] compiled for 1.18.4, module version = 1.0.0 [ 621.616] ABI class: X.Org ANSI C Emulation, version 0.4 [ 621.616] (II) UnloadModule: "fbdev" [ 621.616] (II) Unloading fbdev [ 621.616] (II) UnloadSubModule: "fbdevhw" [ 621.616] (II) Unloading fbdevhw [ 621.616] (II) UnloadModule: "vesa" [ 621.616] (II) Unloading vesa [ 621.616] (==) Depth 24 pixmap format is 32 bpp [ 621.680] (==) modeset(0): Backing store enabled [ 621.680] (==) modeset(0): Silken mouse enabled [ 621.680] (II) modeset(0): RandR 1.2 enabled, ignore the following RandR disabled message. [ 621.680] (==) modeset(0): DPMS enabled [ 621.680] (II) modeset(0): [DRI2] Setup complete [ 621.681] (II) modeset(0): [DRI2] DRI driver: i965 [ 621.681] (II) modeset(0): [DRI2] VDPAU driver: i965 [ 621.721] (EE) modeset(0): failed to set mode: No space left on device [ 621.721] (EE) Fatal server error: [ 621.721] (EE) AddScreen/ScreenInit failed for driver 0 [ 621.721] (EE) [ 621.721] (EE)