Comment 30 for bug 198849

(In reply to comment #28)
> Created an attachment (id=14424) [details]
> intel_reg_dumper run in 1280x1024 mode
>
> Run after reboot, with drivers from git and VGA and HDMI->DVI adapter plugged
> in
>

SDVOB: 0x40080084 (disabled, pipe B, stall disabled, detected)

The SDVOB output is disabled when using intel driver while it is enabled in the vesa driver. It is weird since driver enabled it during startup.

What is the output of xrandr when SDVOB is disabled?
Or can you try to run intel_reg_dump frequently to see when the SDVOB is disabled?

in comment 18
> intel driver appears to know that the DVI cable is connected and
> disconnected...
So you are connect/disconnect the DVI cable and xrandr reports the correct states?