On a acer aspire laptop (5741z) running ubuntu 12.04 with kernel 3.10.9 and kernel 3.11-rc7 with a intel HD VGA using the driver i915, I get a total black screen when close the laptop lid and reopen the lid.

When Laptop lid is close the file /sys/class/backlight/intel_backlight/brightness get a '0' value but when the lid is reopen that file don't get back the value from /sys/class/backlight/intel_backlight/actual_brightness or /sys/class/backlight/intel_backlight/max_brightness resulting on a total black screen.

I been able to restore the brightness of the screen using the fn key on my laptop after reopen the laptop lid, so this way the value of /sys/class/backlight/intel_backlight/actual_brightness was increasing, but I have to do this everytime I close the lid.

The fn + keys only works when I add the value: 'acpi_backlight=vendor' on grub boot command line.

lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)