[Bug 18125] no output on LVDS if booting with external VGA connected

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Sun Oct 19 21:08:58 PDT 2008


Alex Deucher <agd5f at yahoo.com> changed:

           What    |Removed                     |Added
          Component|Driver/Radeon               |Server/general

--- Comment #3 from Alex Deucher <agd5f at yahoo.com>  2008-10-19 21:08:57 PST ---
It looks like the xserer is not properly taking into account the crtc
limitations of the outputs when setting up the output topology:

VGA-0 connected 1024x768+0+0 (0x55) normal (normal left inverted right x axis y
axis) 304mm x 228mm
        Clones:     DVI-0
        CRTC:       0
        CRTCs:      0 1
LVDS connected (normal left inverted right x axis y axis)
        CRTCs:      0

crtc 0 gets assigned to VGA-0, and since LVDS is restricted to crtc 0 does not
allow cloning I suspect it ends up in some kind of undefined state (on but
being driven by the crtc timing for VGA-0 probably rather than native panel
timing).  The xrandr core code used to work correctly in this case.  Any chance
you could bisect the xserver to find out what change broke this?

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