I mentioned that I'd had endless difficulties with LCDs and Linux, and it just happened again. uname shows that I'm running 2.6.15-27-386 when I should be at 2.6.17 (I think). I thought perhaps I just hadn't rebooted, as Adept shows no upgrades. I rebooted, and the video died. The boot sequence is visible. X starts, and the login screen is displayed. After logging in, however, the screen goes black, the monitor complains that the frequencies are out of range, and that's that. I rebooted into Knoppix with no problem whatsoever, copied the monitor section from Knoppix, and edited xorg.conf. Chaos. I left it for a bit, and came back to see the login screen displayed. I logged in, changed the resolution from 1024x768 to 1280x1024, and am running nicely, but I'm scared to reboot. The xorg.conf Monitor section I copied from Knoppix was: Section "Monitor" identifier "SYS-172L" vendorname "Plug 'n' Play" modelname "Plug 'n' Play" HorizSync 30 - 80 # DDC-probed VertRefresh 50 - 85 # DDC-probed # These are the DDC-probed settings reported by your monitor. # 1280x1024, 75.0Hz; hfreq=79.98, vfreq=75.03 ModeLine "1280x1024" 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync # 1024x768, 75.0Hz; hfreq=60.02, vfreq=75.03 ModeLine "1024x768" 78.75 1024 1040 1136 1312 768 769 772 800 +hsync +vsync # 1024x768, 70.0Hz; hfreq=56.48, vfreq=70.07 ModeLine "1024x768" 75.00 1024 1048 1184 1328 768 771 777 806 -hsync -vsync # 800x600, 75.0Hz; hfreq=46.88, vfreq=75.00 ModeLine "800x600" 49.50 800 816 896 1056 600 601 604 625 +hsync +vsync # #800x600, 72.0Hz; hfreq=48.08, vfreq=72.19 ModeLine "800x600" 50.00 800 856 976 1040 600 637 643 666 +hsync +vsync gamma 1.0 EndSection The xorg.conf I have now is: Section "Monitor" identifier "SYS-172L" vendorname "Plug 'n' Play" modelname "Plug 'n' Play" modeline "640x480@60" 25.2 640 656 752 800 480 490 492 525 -vsync -hsync modeline "640x480@72" 31.5 640 664 704 832 480 489 491 520 -vsync -hsync modeline "640x480@75" 31.5 640 656 720 840 480 481 484 500 -vsync -hsync modeline "640x480@85" 36.0 640 696 752 832 480 481 484 509 -vsync -hsync modeline "800x600@56" 36.0 800 824 896 1024 600 601 603 625 +hsync +vsync modeline "800x600@72" 50.0 800 856 976 1040 600 637 643 666 +hsync +vsync modeline "800x600@75" 49.5 800 816 896 1056 600 601 604 625 +hsync +vsync modeline "800x600@85" 56.3 800 832 896 1048 600 601 604 631 +hsync +vsync modeline "800x600@60" 40.0 800 840 968 1056 600 601 605 628 +hsync +vsync modeline "832x624@75" 57.284 832 864 928 1152 624 625 628 667 -vsync -hsync modeline "1024x768@85" 94.5 1024 1072 1168 1376 768 769 772 808 +hsync +vsync modeline "1024x768@75" 78.8 1024 1040 1136 1312 768 769 772 800 +hsync +vsync modeline "1024x768@70" 75.0 1024 1048 1184 1328 768 771 777 806 -vsync -hsync modeline "1024x768@60" 65.0 1024 1048 1184 1344 768 771 777 806 -vsync -hsync modeline "1152x864@75" 108.0 1152 1216 1344 1600 864 865 868 900 +hsync +vsync modeline "1152x768@54 " 64.995 1152 1178 1314 1472 768 771 777 806 +hsync +vsync modeline "1280x854" 80.0 1280 1309 1460 1636 854 857 864 896 +hsync +vsync modeline "1280x1024@75" 135.0 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync modeline "1280x960@60" 102.1 1280 1360 1496 1712 960 961 964 994 -hsync +vsync modeline "1280x1024@60" 108.0 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync modeline "1280x960@75 " 129.86 1280 1368 1504 1728 960 961 964 1002 -hsync +vsync modeline "1400x1050@60" 122.61 1400 1488 1640 1880 1050 1051 1054 1087 -hsync +vsync modeline "1600x1200@60" 162.0 1600 1664 1856 2160 1200 1201 1204 1250 +hsync +vsync gamma 1.0 EndSection How come? How come Knoppix 3.9 came right up and Kubuntu wouldn't? How come Kubuntu "fixed" itself? Come to that, how come Kubuntu rewrote my xorg.conf file? The first thing I notice is that Knoppix specified values for HorizSync and VertRefresh in Section "Monitor", but Kubuntu doesn't. Is that significant? stew