On Tue, 2008-11-18 at 09:43 +1100, garrone wrote: > Using the intel driver on a GM45 device, with monitors > connected to the TMDS1/2 outputs, it was found that > the xserver was refusing to accept the option > option "Monitor-TMDS-2" "<monitor-id>" > and also leaving the second screen rather blank. > > Eventually, it was found that at xf86-video-intel::src/i830_driver.c, > function I830SetupOutputs, line 922, the register SDVOC is anded with > the SDVO_DETECTED mask in order to detect if a monitor was connected at > startup. This register bit was clear, causing the screen to be missed. > > A careful reading of the intel documentation shows that while this bit > indicates an initially detected connected monitor for SDVOB, > in fact it is reserved in the SDVOC register, and should therefore be > ignored. > > So to cause the second monitor to be enabled, the > option ForceSDVODetect, false by default, should be set to true. > Perhaps consideration could be given to defaulting this option to true, > or even ignoring such initialization bits as SDVO_DETECTED altogether.
It's true that the bit is reserved for G/GM965, but not for G/GM45. Also, (still) by my reading, it's not about a monitor being connected at startup, but the SDVO chip being present. -- Eric Anholt [email protected] [email protected]
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