After the system configured itself, it still boots into 1224 x 768 (4:3), which makes real estate go off-screen at the right and bottom, affecting both lightdm and the desktop environment. See my bug report at https://bugs.launchpad.net/lightdm/+bug/1047140
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. Might this be the EDID issue, causing a delay while Ubuntu decides how to treat my LCD screen? I've run various diagnostics and my HD is fine, only one fan is out, which is noted by the Apple diagnostic. This MacBook Pro used to boot fine with prior versions of Ubuntu which didn't have this TFT issue. 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. And it should not go into an episodic and alternating blanking loop. Comments: I've had the same issue with another (LCD?) monitor on another Ubuntu 120.10 beta install, and I've had to resort to the same fix. Info to come. So I suspect that this is a LCD problem or one of just having low tolerance for defective EDID. -- 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/1047156 Title: EDID does not allow LCD widescreen configuration Status in “xorg” package in Ubuntu: New Bug description: Ubuntu has new strict EDID guidelines that does not allow LCD widescreen configuration. Symptoms: Constant flickering on and off of screen content, including distortion similar to a bad tv reception. The screen is a LCD Citizen C19604HD that should run 1440x 900 at 60 Hz (as per manual), which apparently does not have proper EDID. I should note this setup had no problems prior, until tty1 started to complain about a bad EDID checksum during 12.10 beta. Fix: Attempting to set my own xorg.conf evoked a message about running in low graphics mode. It asked if I wanted to (re)configure. I confirmed, after which I no longer needed xorg,conf, nor presumably Option "IgnoreEDID" "on" in xorg.conf which made xorg sessions usable. What should happen The system should be self-healing. The user should not have to grapple with xorg.conf (for hours or days on end with unfamiliar concepts [EDID] and work-arounds), and even less after all that time and effort just to have the system say, "Hey, I don't like what you're doing. Here, let me do it.". This (self-repair) hook should be invoked sooner in the trouble shooting process. See related problem about https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1047146 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1047156/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
