I've got a Lenovo ThinkPad X220 with Intel graphics. When I plug in a VGA cable, my desktop automatically notices it and reconfigures the desktop. When I use a DisplayPort -> DVI cable, this doesn't happen and I have to run xrandr by hand (with no arguments is fine, merely querying RANDR makes the driver notice I plugged in the cable).
So far I filed an Ubuntu bug[1], tried to upgrade my BIOS (well, UEFI, I suppose), tried the latest upstream kernel. No luck. [1] https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1263681 How can I debug this? Which component is supposed to detect these events -- the kernel driver or the userspace bits in X.org? If it's the kernel, what's the mechanism it uses to notify userspace about that event? How does X notify clients about newly appearing monitors? What command-line tools are there to watch for these events (not) showing up? What's the appropriate upstream for this bug? Marius Gedminas -- Well, there's a quantum computer that can factor 15, so those of you using 4-bit RSA should worry. -- Bruce Schneier
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