I gather this is related to the low tolerance of faulty EDID I reported in https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1047156 Here's what I reported therein.
Solution: I've had to force the resolution with the following. xrandr --newmode "1440x900_60.00" 106.47 1440 1520 1672 1904 900 901 904 932 +HSync +VSync xrandr --addmode DVI-0 1440x900_60.00 xrandr --output DVI-0 --mode 1440x900_60.00 In place of the first line, the following also has worked for me --something I just got off the net, if I recall. xrandr --newmode "1440x900_60.00" 106.50 1440 1528 1672 1904 900 903 909 934 -hsync +vsync Now, I've had to automate it by placing that into ~/.xprofile Results: - X starts with the native mode 1440x 900 at 60 Hz, or just shy of 60, 59 if I recall. It blanks out black once or twice though. - lightdm sometimes entirely fits onto the physical screen, sometimes it doesn't. - It takes "forever" to reach lightdm. Expected results: I guess it goes without saying that the expected results should be that the system should auto-configure itself so as to not require user intervention. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1047146 Title: xorg fails to configure native 1440 x 900 on LCD widescreen Status in “xorg” package in Ubuntu: New Bug description: The screen is a LCD Citizen C19604HD that should run 1440x 900 at 60 Hz (as per manual). Upon entering the desktop the session is also excessively large, 1224 x 768 (4:3) and only allows a worse setting of 800 x 600 (4:3). I must say, that every once in a while, Display panel will show the following available (I've tried all of them) resolutions. The problem is that they're usually not accessible. For the sake of completeness, I'll list them all, although I'm only really interested in the top one. 1440 x 900 1366 x 768 1360 x 768 1280 x 1024 1280 x 960 1280 x 800 1280 x 768 1152 x 864 1024 x 768 1024 x 576 832 x 624 800 x 600 When confronted with the black screen, I've tried editing xorg.conf, but that's resulted in black screens, even black ttys, forcing me to do the following workaround: -boot up on a live-cd, -mount the HD and -sudo rm /etc/X11/xorg.conf -reboot onto the HD To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1047146/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
