Hi all, I am a debian user. I recently bought a LCD display, which I intended to use as an external display for my laptop (HP NC4000 with IGP 340M). I've read some articles about dual-head set-up on the web. The problem is that it works flawlessly on XFree86 in debian testing, but not on <a href="http://X.org">X.org</a> in debian testing. <a href="http://X.org">X.org</a> complains that it "Failed to detect secondary monitor, MergedFB/Clone mode disabled". Here is a part of the output of diff between xorg.log and XFree86.log (diff Xorg.log.0 XFree86.log.0): 23c534,536 < (II) RADEON(0): EDID data from the display on port 1 ---------------------- --- > (II) RADEON(0): Displays Detected: Monitor1--Type 2, Monitor2--Type 1 > > (II) RADEON(0): Monitor2 EDID data --------------------------- 59a573 > (II) RADEON(0): End of Monitor2 EDID data -------------------- 61,74c575,918 < (II) RADEON(0): Primary: < Monitor -- CRT < Connector -- VGA < DAC Type -- Primary < TMDS Type -- NONE < DDC Type -- VGA_DDC < (II) RADEON(0): Secondary: < Monitor -- NONE < Connector -- Proprietary < DAC Type -- TVDAC/ExtDAC < TMDS Type -- NONE < DDC Type -- NONE < (II) RADEON(0): PLL parameters: rf=2700 rd=60 min=12000 max=35000; xclk=13300 < (WW) RADEON(0): Failed to detect secondary monitor, MergedFB/Clone mode disabled --- > (II) RADEON(0): Primary Display == Type 2 > (II) RADEON(0): Panel ID string: 1024x768 > (II) RADEON(0): Panel Size from BIOS: 1024x768 > (II) RADEON(0): BIOS provided dividers will be used. > (==) RADEON(0): Using gamma correction (1.0, 1.0, 1.0) > (II) RADEON(0): Validating modes on Primary head --------- > (II) RADEON(0): Total number of valid DDC mode(s) found: 0 > (II) RADEON(0): Valid mode using on-chip RMX: 1024x768 > (II) RADEON(0): Total number of valid FP mode(s) found: 1 > (--) RADEON(0): Virtual size is 1024x768 (pitch 1024) > (**) RADEON(0): *Mode "1024x768": 65.0 MHz (scaled from 0.0 MHz), 48.4 kHz, 60.0 Hz > (II) RADEON(0): Modeline "1024x768" 65.00 1024 1040 1176 1344 768 770 776 806 > (**) RADEON(0): Default mode "640x350": 65.0 MHz (scaled from 0.0 MHz), 48.4 kHz, 60.0 Hz > (II) RADEON(0): Modeline "640x350" 65.00 640 1040 1176 1344 350 770 776 806 > (**) RADEON(0): Default mode "640x400": 65.0 MHz (scaled from 0.0 MHz), 48.4 kHz, 60.0 Hz > (II) RADEON(0): Modeline "640x400" 65.00 640 1040 1176 1344 400 770 776 806 > (**) RADEON(0): Default mode "720x400": 65.0 MHz (scaled from 0.0 MHz), 48.4 kHz, 60.0 Hz > (II) RADEON(0): Modeline "720x400" 65.00 720 1040 1176 1344 400 770 776 806 > (**) RADEON(0): Default mode "640x480": 65.0 MHz (scaled from 0.0 MHz), 48.4 kHz, 60.0 Hz > (II) RADEON(0): Modeline "640x480" 65.00 640 1040 1176 1344 480 770 776 806 > (**) RADEON(0): Default mode "800x600": 65.0 MHz (scaled from 0.0 MHz), 48.4 kHz, 60.0 Hz > (II) RADEON(0): Modeline "800x600" 65.00 800 1040 1176 1344 600 770 776 806 > (**) RADEON(0): Default mode "832x624": 65.0 MHz (scaled from 0.0 MHz), 48.4 kHz, 60.0 Hz > (II) RADEON(0): Modeline "832x624" 65.00 832 1040 1176 1344 624 770 776 806 > (==) RADEON(0): DPI set to (75, 75) Thanks Eddie