A simpler workaround: pressing Fn-Home/Fn-End (screen brightness control
keys) after plugging in the DisplayPort cable also triggers detection.
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I wonder if this is the same as bug
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1314213
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https://bugs.launchpad.net/bugs/1263681
Title:
8086:0126
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Expired = New
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https://bugs.launchpad.net/bugs/1263681
Title:
8086:0126 [Lenovo a ThinkPad
[Expired for xserver-xorg-video-intel (Ubuntu) because there has been no
activity for 60 days.]
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Incomplete = Expired
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Tried talking about this on IRC (#intel-gfx on FreeNode). It was
suggested to me to capture the kernel log after setting drm.debug to
0x5. That produced quite a lot of log output (70 thousand lines in
about a minute), and after some trimming I got something that could
perhaps be useful:
Chris Wilson said this on IRC:
The issue is that after the hotplug interrupt is sent by the hardware,
the monitor is not yet ready to respond to the DDC probes and generates
a NAK instead - this leads us to conclude that there is nothing on the
other end of the connector
so it looks like a
** Tags removed: kernel-bug-exists-upstream
** Tags added: needs-upstream-testing
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https://bugs.launchpad.net/bugs/1263681
Title:
8086:0126 [Lenovo a ThinkPad
** Package changed: xorg (Ubuntu) = xserver-xorg-video-intel (Ubuntu)
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https://bugs.launchpad.net/bugs/1263681
Title:
8086:0126 [Lenovo a ThinkPad X220]
I didn't have a DisplayPort cable before. I used an analog VGA cable
and hotplug detection worked reliably.
I could boot a 12.04 LTS LiveCD and test it, if it's important.
I'd like to help debug this. It would help if I knew how hotplug
detection is supposed to work, and what tools there are
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