Comment 36 for bug 754799
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#36 |
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73416ba
(Get the code!)
I have had exactly the same symptoms on my Toshiba Satellite Pro S300M with Intel GM45 video, and the problem has existed from at least Fedora 12 to 15 inclusive, so since I'm not on Ubuntu it's definitely an upstream bug.
If I boot with the external monitor plugged in, boot messages are shown on both screens, and dual-monitor support in X works fine. If I don't boot with the external monitor plugged in, but latter plug in a VGA monitor, xrandr detects the monitor fine and says it's connected, but the monitor continues to cycle between blank and an error message screen saying that it has no signal. Manually switching the xrandr setting for the monitor from "--off" to "--auto" does nothing.
As an aside: this bug report describes problems with external monitor support if the external monitor is *not* plugged in during boot. I also reported the following somewhat-related bugs to the Fedora Bugzilla re. problems with suspend/resume and backlight support being flaky if the machine *is* booted with the monitor plugged in:
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