The problem apparently is in the Intel graphics driver. 
Meanwhile I'm using the vesa driver, I had to edit the /etc/default/grub file:

## Original:
## GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
## Now:
GRUB_CMDLINE_LINUX_DEFAULT="quiet nomodeset xforcevesa acpi_osi=Linux"

I'm not sure of the effect of

  acpi_osi=Linux

but I couldn't even boot without nomodeset and xforcevesa options.

-- 
Computer boots in low-graphics mode (intel graphics card)
https://bugs.launchpad.net/bugs/600453
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