I have a similar setup here: Dell Latitude D610 with ATI Technologies Inc M22 [Mobility Radeon X300] Docking station Two external monitors, each capable of 1600x1200, connected through the DVI and VGA ports of the docking station
and I'm seeing a very similar problem: whichever (external) monitor that's currently using CRTC 0 can't display the signal when I attempt using the 1600x1200 mode. CRTC 1 works nicely with this mode, no matter which of the external monitors is using it. Reducing the mode for the CRTC 0-connected monitor to 1200x1024 makes it usable. (I'm not seeing any of the LVDS "nonsense" on startup, though. I did see something like that when I tried a very wide "Virtual" setting in xorg.conf, but as I don't need that much width, I reduced it back to 3200, which doesn't cause any artefacts). The same physical setup was working nicely under feisty (with 2x1600x1200 on Xinerama), so I'm guessing that this is a CRTC 0-specific deficiency in the radeon driver. I've also tried upgrading the X drivers from Tormod Volden's launchpad archive (deb http://ppa.launchpad.net/tormodvolden/ubuntu gutsy main), but that didn't help. Let me know if you would like me to attach any diagnostic data for my case. -- Dual-head fails with ati driver, appears related to 'crtc' https://bugs.launchpad.net/bugs/172601 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
