> I tried a two-headed configuration, with the CRT defined in separate monitor > and device sections. That worked once or twice, but usually caused the LCD > to bloom. I've tried changing the modules, excluding various ones in some > experiments. It seems to be very sensitive to whether the monitor (a > Viewsonic G810) is connected, so it's some interaction of the laptop BIOS and > DDC, I guess. For example, when I have a single-screen configuration, set to > 1280x1024 (so that both the CRT and LCD can display it), and I've turned the > LCD off with the keyboard function-key control, then when I fire up X the LCD > always turns back on so that both the CRT and LCD are on. > > I've been looking for a way to keep the LCD off so that I can drive the CRT at > a nice high resolution that both the CRT and Radeon support (exceeding the > specs on the LCD). crt_screen option is broken. This option was originally intended to do exactly what you want, but the part of code for turning off panel is missing somehow. So when you use this option, both heads are driven by the same CRTC according to the capability of the CRT connected. This causes the problem on your panel. The new approach to this issue in upcoming driver: When both heads have monitor connected, the driver will always use a different CRTC to control each head and bring both monitor up according to the spec of individual monitor. This does not require the dual-head setup in your config file and two monitors are in "clone" mode. Some people do wish to have two monitors mirroring each other (for example, when connecting a projector to the laptop). There is an option (PanelOff) to turn off your panel if you don't want to see anything there. When in "clone" mode, the two monitors don't have to be in same resolution and DRI, overlay will all work correctly on both monitors. For example, in your case, you can use a normal single-head config with 1600x1200 in the Device section. The driver will bring up your LCD to 1400x1050 and CRT to 1600x1200 (driver will also handle panning). You can turn your LCD off with the PanelOff option. This part of work (along with other things) is being merged into current CVS tree (not finished yet). I have working code in my system. If you want a give it a try, I can send you the binary for x420 or the source.
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