Bug#908773: Solution

[Marco Righi]

Hi,
perhaps the problem is that the main monitor has a lower resolution than
the secondary one.

Command# xrandr
Screen 0: minimum 8 x 8, current 3600 x 1080, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
VGA-0 connected 1920x1080+1680+0 (normal left inverted right x axis y
axis) 531mm x 299mm
   1920x1080     60.00*+
   1680x1050     59.95
   1600x1200     60.00
   1440x900      59.89
   1280x1024     75.02    60.02
   1280x960      60.00
   1152x864      75.00
   1024x768      75.03    70.07    60.00
   800x600       75.00    72.19    60.32    56.25
   640x480       75.00    72.81    59.94
DVI-I-1 connected 1680x1050+0+0 (normal left inverted right x axis y
axis) 474mm x 296mm
   1680x1050     60.45*+  59.95    59.88
   1600x1200     60.00
   1440x900      59.89
   1280x1024     75.98    75.02    60.02    60.02
   1152x921      65.85
   1152x900      66.00
   1024x768      75.03    70.07    60.00
   800x600       75.00    72.19    60.32    56.25
   640x480       75.00    72.81    59.94
HDMI-0 disconnected (normal left inverted right x axis y axis)

I patched the problem by adding the following lines

### MARCO INIZIO ###

GRUB_GFXMODE=640x480

# Hack to force higher framebuffer resolution
GRUB_GFXPAYLOAD_LINUX=640x480

### MARCO FINE ###

in

/etc/default/grub

(and runingn the update-grub command)

Thx
Marco Righi