Zu dem Problemen in Verbindung mit dem Acer AL2423W und einer GeForce habe ich ein paar Threads gefunden:
Gentoo Forums :: View topic - Weird problem Acer AL2423W + Nvidia Geforce 7600GS [unsolved
Weird problem Acer AL2423W + Nvidia Geforce 7600GS - nV News Forums
ACER AL2423W no image from DVI
Acer AL2423W 1920x1200 vs FX5700 NVIDIA Linux Question
EnTech Taiwan :: View topic - ACER AL2423W no image from DVI
Zitate aus den Threads:
horde
Hi,
I also have the acer al2423w and was unable to get input from the dvi. I would not even see the bios post screen.VGA worked fine.
I have a nvidia card (asus 6800gt). My previous LCD (philips 19") works just fine over DVI.
After many tries with cable swapping etc i ended up updating the EDID on the DVI port of the monitor.
I used the info found here
http://www.geocities.com/jgeneedid/#Information_on_Crafting_an_EDID (*DEAD LINK*)
I retrieved the EDID from port 0 (VGA). after editing it i flashed it to the DVI port using ddwc. i rebooted with only the DVI cable connected. I got signal! it worked all the way to the desktop as its supposed to.
changes i made in the retrieved edid:
1. set input from analog to digitel and switched on DFP 1.x compatible
2. power + supported feature: switched on: standby, suspend, active-Off.
Note.
i needed several tries before i got in the right 'EDID' in. i've only used ddwc on the dvi port (switch: "ddwc -m 1 -f digital.txt" where digital txt is a properly formatted txt file with the corrected EDID - see the link above for info).
samov:
did the same to my monitor... and i used powerstrip to update the EDID.
question... Does anyone have a valid EDID downloaded from a 100% working factory DVI connection? (not a modified one)
here is the modified working version... update it over DVI
Gratis unlimitiertes Datei und Image Hosting - BADONGO(*DEAD LINK*)
ndorphin:
I had the same problem with my AL2423W. I tried the hints here but my dvi port didn't work. So i sent my monitor back to acer - they updated the firmware and sent it back to me. But the dvi port still didn't work. I was despaired! But in the last moment i tried to update the edid with ddcw and i used the switch "-m 2" instead of "-m 1" and: it works!!!!
So if somebody have the same problem try:
"ddcw -m 2 -f digital.txt" instead of "ddcw -m 1 -f digital.txt"
I don't know why "-m 2" (ddcw help displays only 0=VGA or 1=DVI as options) solved my problem but maybe some european models have HDCP @DVI and so there are 3 ports (VGA, HDCP@DVI, DVI).
Daraus folgere ich, dass die Extended Display Identification Data (EDID) im Display via DVI mit einem Programm wie ddcw oder Powerstrip geupdated/geflasht werden muss?!
Soweit ich das bisher verstanden habe:
1. Acer Al2423W via DVI-VGA Adapter an die GTX570 anschließen
2. mit ddcw die EDID des VGA-Anschlusses auslesen
3. in der ausgelesenen Datei die Eingabe von analog auf digital ändern und "DFP 1.x compatible" aktivieren sowie "power + supported feature: switched on: standby, suspend, active-Off"
4. die neue datei via ddcw wieder auf das Display flashen.
Bei Punkt 3. bin ich mir nicht ganz sicher wie das Konkret aussehen würde, da das auslesen der EDID ja nur HEX ausgibt.
Wäre super wenn mir jemand dazu ein paar Tipps/Ratschläge geben kann.
Besten Dank
. Und sogar von 3 verschiedenen Herstellern 
