I found this workaround (from bug #35223, comment #51):

"[...] If I put

echo 2 > /sys/class/backlight/acpi_video0/brightness

in /etc/rc.local (before exit 0) it seems to work."

Indeed it works; I just changed 2 to 1, as 1 gives a low but acceptable
brightness level on this laptop.

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https://bugs.launchpad.net/bugs/968532

Title:
  Laptop screen dims at login screen

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