[SOLVED] iMac Blackscreen / Xorg no screens found

Question

Hello ladies and gentlemen,
this is my first post so far. I am very satisfied with my archlinux setup on my macbook (2006). But i ran into a Problem i could not solve with google, arch forum and arch wiki.
===  The Setup ===
iMac from late 2010 (Computer with built-in Monitor)
Archlinux install from nov. 2012
=== The story  ===
I tried a lot of Linux distributions to install:
- Archlinux (from CD, Install-Image from 11/2012 )
- Ubuntu (from USB, v. 12.10 & 12.04 LTS)
- Cinnarch (12.11.22 minimal netinstaller)
I always ran into the same problem:
Booting w/ a black screen (no LED Backlight - It was possible to login and reboot the computer blindly)
booting w/ screen with nomodeset
I tried the Opensource ATI driver (i used the walkthrough on the WIKI)
and i also tried the closed-source catalyst-234k driver with old xorg-server (1.12 and 1.11).
=== The Issue ===
Normal Boot:
After ~1s of STDoutput i get a black screen without LED backlight (its like unplugging the Monitor) - I was able to login and reboot blindly
Fallback Boot (with Kernelmode "nomodeset" and "debug")
I can boot with no problems - but im not able to launch an xorg-server successfully.
I have no possibility to "startx" or "Xorg -configure" - it always throws me an error (No screens found)
===  The Logs / System Information ===
lsmod | grep radeon
radeon 859655 0
ttm ... 1 radeon
drm_kms_player ... 1 radeon
drm ... 3 ttm,drm_kms,radeon
i2c_algo_bit ... 1 ....
i2c_core ... 6 ...
lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV730 XT [Mobility Radeon HD 4670]
cat /var/log/Xorg.0.log | grep EE
(EE) failed to load module VESA (module does not exist)
(EE) No drivers available
the xf86-video-ati is installed!
and if i install vesa drivers:
the screen freezes on startx and i have to hard-reboot.
I cant list whole log here, because i need to retype everything x(
cat/var/log/Xorg.0.log
...only informational stuff, some warnings and no errors:
(WW) the directory (/usr/share/fonts(OTF/) does not exist.
(WW) open ACPI failed (/var/run/acpid.socked)(no such file or directory)
and on Xorg -configure
Number of created screens does not match number of detected devices.
Configuration failed.
Server terminated with error 2. closing logfile
my /root/.xinitrc and ~/.xinitrc
exec gnome-session
(yes, gnome is installed!)
thats it so far. any help?
=== The Solution  ===
- none yet.
Last edited by moolen (2012-12-07 09:50:27)

Answer 1

I worked it out.
i used the awesome AUI script by helmuthdu
https://github.com/helmuthdu/aui
i installed X, loginmanager and a Desktop environment and it works well.