Description:
On my Dell lattitude D500, when acpi is on, laptop screen goes off when closing lid and doesn't turn on again.
If i915 is loaded system hangs completely.
If X has been started, the screen goes on again,
but it stays black and you only see a cursor (which won't move).

Without acpi the laptop screen is turned off until opening the lid.
Then the screen is turned on again.
I presume it's only the backlight that is turned off, but I can't see.

Additional info:
* package version(s)
3.14.1-1-ARCH #1 SMP PREEMPT i686 GNU/Linux

* config and/or log files etc.
output of dmesg when lid is pressed and system doesn't hang.
[ 400.656028] ACPI: \_SB_.PCI0: ACPI_NOTIFY_BUS_CHECK event

lspci:
00:00.0 Host bridge: Intel Corporation 82852/82855 GM/GME/PM/GMV Processor to I/O Controller (rev 02)
00:00.1 System peripheral: Intel Corporation 82852/82855 GM/GME/PM/GMV Processor to I/O Controller (rev 02)
00:00.3 System peripheral: Intel Corporation 82852/82855 GM/GME/PM/GMV Processor to I/O Controller (rev 02)
00:02.0 VGA compatible controller: Intel Corporation 82852/855GM Integrated Graphics Device (rev 02)
00:02.1 Display controller: Intel Corporation 82852/855GM Integrated Graphics Device (rev 02)
00:1d.0 USB controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #1 (rev 01)
00:1d.1 USB controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #2 (rev 01)
00:1d.2 USB controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) USB UHCI Controller #3 (rev 01)
00:1d.7 USB controller: Intel Corporation 82801DB/DBM (ICH4/ICH4-M) USB2 EHCI Controller (rev 01)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 81)
00:1f.0 ISA bridge: Intel Corporation 82801DBM (ICH4-M) LPC Interface Bridge (rev 01)
00:1f.1 IDE interface: Intel Corporation 82801DBM (ICH4-M) IDE Controller (rev 01)
00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01)
01:01.0 CardBus bridge: O2 Micro, Inc. OZ601/6912/711E0 CardBus/SmartCardBus Controller
01:03.0 Network controller: Intel Corporation PRO/Wireless LAN 2100 3B Mini PCI Adapter (rev 04)
01:08.0 Ethernet controller: Intel Corporation 82801DB PRO/100 VE (MOB) Ethernet Controller (rev 81)

lspci -s 00:02.0 -v
00:02.0 VGA compatible controller: Intel Corporation 82852/855GM Integrated Graphics Device (rev 02) (prog-if 00 [VGA controller])
Subsystem: Dell Latitude D500
Flags: bus master, fast devsel, latency 0, IRQ 11
Memory at f0000000 (32-bit, prefetchable) [size=128M]
Memory at faf80000 (32-bit, non-prefetchable) [size=512K]
I/O ports at c000 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915

Similar issues:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/462939
https://bbs.archlinux.org/viewtopic.php?id=86637

Steps to reproduce:
this is what I've done:
-made a list of all loaded kernel modules (with lsmod and sed)
-turned off ACPI in bootloader and rebooted.
-emulated closing the lid (pushed the little button that the lid pushes on when closed)
-made a second list and used diff to see which modules were loaded with acpi.
-blacklisted these modules, turned acpi on and rebooted
(instead of blacklisting I actually did "install modulename /bin/false" for all modules)
-emulated closing the lid (here I had no display anymore)
-redirected dmesg to a file and rebooted using keyboard
-moved the blacklist file from /etc/modprobe.d to my homedir
-disabled only i915, rebooted, tested again with same results
-enabled i915 on next reboot and system hung.
-to be completely sure, I entered "sleep 5; reboot" before closing the lid. Nothing happened and I had to keep the powerbutton pressed for 5 seconds to turn the laptop off. There were also no signs of kernel panic (the leds weren't flashing)

history:
This is a recent install of Arch. I've had Debian Wheezy on it for a month, which I then converted to Crunchbang. There I did not have this particular problem. But the xorg driver did not have direct rendering. I don't know if ACPI was on (it had the standard setting).