[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete = Expired
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https://bugs.launchpad.net/bugs/754146
** Tags added: natty
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Title:
DisplayPort-based external monitor cannot be enabled
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I'm using DisplayPort daily on my ThinkPad T510 with a Dell 24 display.
There are occasional quirks, especially when the system tries to do
power-saving on the external display or I adjust the relative vertical
position of the screens, but things mostly come up and stay up if I
configure the
adjust the relative vertical position of the screens
Obviously, I mean in the monitor control panel, not physically.
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Title:
DisplayPort-based
I do see the glitch in the original description when I use Fn-F7 to
toggle displays. Usually, toggling to the mode where both screens
display the same thing works fine, but toggling further is unreliable.
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There's a fix for the kernel panic in some of the drm-intel-next
branches (commit 31acbcc408f412d1ba73765b846c38642be553c3).
Note that in my experience DisplayPort is still pretty much broken on
the Natty kernel even with this fix applied.
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Note that this forum post appears to describe the exact same problem I have,
albeit on different hardware:
http://ubuntuforums.org/showthread.php?p=10636426
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** Attachment added: kernel.log
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/754146/+attachment/1997519/+files/kernel.log
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Title:
The kernel log contains two instances of the same oops. I think this
corresponds to when I unplugged the DisplayPort cable.
Apr 7 15:07:55 adar-dev kernel: [ 267.333834] BUG: unable to handle kernel
NULL pointer dereference at 0230
Apr 7 15:07:55 adar-dev kernel: [ 267.336276]
