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[Bug 1292467] Re: Dual screen greeter can break 3D acceleration
Inbox
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Fabiano Brites
Same problem here. So another user affected by this bug. -- You received
this...
10/16/14
Rael
Interesting. My previous version was 12.04. And I spent a huge time
wondering...
Jan 4
bigley.ling
Does anyone know when an update may be fixing this issue? Having to disable
L...
Jun 29
Mathew Hodson mathew.hod...@gmail.com via
<https://support.google.com/mail/answer/1311182?hl=en> canonical.com
4:31 PM (2 hours ago)
to me
** Tags added: trusty

On Fri, Aug 7, 2015 at 4:31 PM, Mathew Hodson <mathew.hod...@gmail.com>
wrote:

> ** Tags added: trusty
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1292467
>
> Title:
>   Dual screen greeter can break 3D acceleration
>
> Status in Release Notes for Ubuntu:
>   Fix Released
> Status in unity-greeter package in Ubuntu:
>   Triaged
>
> Bug description:
>   When booting with two screens (internal LVDS and VGA), lightdm comes
>   up in a mode where it displays separate screen content on both
>   displays (so no mirror mode). These screens seem to be arranged side-
>   by-side regardless of the fact that (like in my case) the combined
>   width can be greater than 2048 and that is not supported with 3D
>   acceleration at least on that older i945GME graphics.
>
>   This results in very poor graphics performance and compiz using a lot
>   of cpu cycles (which are rather limited on this Atom N270 anyways).
>   Even worse, this does not get resolved when changing the setup in
>   system settings to either only having one screen active or arranging
>   them on top of each other).
>
>   WORKAROUND:
>    * Plug in external monitor after login (1)
>    * Boot with "video=LVDS-1:d" (2)
>
>   (1) Booting with only the internal screen and then plugging in the
>   external one after login seems to handle this better (although I
>   probably need to remove any previous config to get into a kind of
>   vanilla state again). Also it seems to be ok when I had the dual
>   monitor boot and lightdm coming up side-by-side, when unplugging the
>   external monitor before logging in.
>
>   (2) This will completely disable the internal screen for that boot. It
>   cannot be enabled through the settings dialogue.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu-release-notes/+bug/1292467/+subscriptions
>

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You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1292467

Title:
  Dual screen greeter can break 3D acceleration

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu-release-notes/+bug/1292467/+subscriptions

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