Hi, When you have two graphic cards that both have Source Output and Sink Output capabilities (intel and nouveau for example). It's very easy to flip parameters of xrandr --setprovideroutputsource and attempt to provide outputs of the main screen to the slave screen.
That triggers assert fault in: ProcRRSetProviderOutputSource xf86RandR14ProviderSetOutputSource DetachUnboundGPU assert(slave->isGPU); And whole X server crashes. I would like to fix it, but I am not sure what would be the best approach: 1) Add check to ProcRRSetProviderOutputSource and return BadValue when the provider is the main screen. 2) Filter out Sink Output capability of the main screen, that way ProcRRSetProviderOutputSource would also return BadValue and xrandr and other tools will be aware in advance that the screen can not work as Sink Output. 3) Something else? Michal Srb _______________________________________________ xorg-devel@lists.x.org: X.Org development Archives: http://lists.x.org/archives/xorg-devel Info: http://lists.x.org/mailman/listinfo/xorg-devel