Thread bump.
I'm running an I9 gaming pc with a reasonably capable video card. Still
having massive lag with split monitors and even sometimes in single
desktop mode, up to and including full freezes / system hangs. I should
clarify I am not using this as a gaming pc, just dev work. This slowdown
This bug affects me on Ubuntu 14.04 LTS, also tried 15.04.
I have two benq gl2450. If i boot with both plugged in, i have
performance issues, window drag lag etc... I unplug hdmi one, and plug
it in after login, don't have issue, as suggested here, as workaround.
Is it possible that still isn't
** Tags added: trusty
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https://bugs.launchpad.net/bugs/1292467
Title:
Dual screen greeter can break 3D acceleration
Status in Release Notes for Ubuntu:
Fix
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[Bug 1292467] Re: Dual screen greeter can break 3D acceleration
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Fabiano Brites
Same problem here. So another user affected by this bug. -- You received
this...
Does anyone know when an update may be fixing this issue? Having to
disable LVDS (GRUB_CMDLINE_LINUX=video=LVDS-1:d) to get descent
performance from an external VGA display is not ideal, as I would call
it a temporary fix, as when one wants to use the internal LVDS, it has
to be reenabled each
Interesting. My previous version was 12.04. And I spent a huge time
wondering why I'm facing bad performance when enabling the 3D card +
external monitor.
Wondering if every people complaining about the poor 3D accel + external
monitor get to know about this bug, the size of affects X people will
Same problem here. So another user affected by this bug.
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Title:
Dual screen greeter can break 3D acceleration
Status in
Disabling a monitor through the system settings also seems to fix this,
and it doesn't require a reboot. The issue returns once the monitor is
re-enabled.
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Comment #8 seems out of context. Once booted there is no problem
plugging in and unplugging monitors, changing resolution and scan
frequencies. Additionally there is no problem suspending and resuming--
which is a good reason to never reboot unless resume fails or a boot
into windows / different
Same here with an i915. Unity was completely unusable after upgrading
12.04 - 14.04, the internal display which I never used was breaking 3d
acceleration. I had the problem with both the Ubuntu default package and
the Intel drivers from 01.org. The computer is a low-end PC used as a
server, so
This exact bug seems to happen on a Dell M3800 Laptop with Haswell
graphics.
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https://bugs.launchpad.net/bugs/1292467
Title:
Dual screen greeter can break 3D
This exact bug seems to happen on a Toshiba Satellite L-300 with Intel
Centrino 2 Core Duo T5750 with GME965 GPU using i915 driver under Linux
Kernel's 3.13.xx and 3.15.xx with Ubuntu 14.04. Work around to unplug
the external TV on every reboot is a minor inconvience.
When Henry in comment #5
Hi Andy,
You changed the status of this bug from New to Fix Released on April
17. Are you referring to the workaround you documented in the
description, or was a fix for this bug actually implemented? I do not
see this bug (1292467) listed in the change summary for Ubuntu 14.04.1
at
Hi Patricia, that was only the release-notes task. So we just noted
wrote down there that this can happen and how to work around it. I have
not seen or heard anyone fixing (or even looking at) the problem.
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When this fixed in 14.04 Trusty Tahr for 14.04.1 (24 July)?
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https://bugs.launchpad.net/bugs/1292467
Title:
Dual screen greeter can break 3D acceleration
Status
** Changed in: ubuntu-release-notes
Assignee: (unassigned) = Andy Whitcroft (apw)
** Changed in: ubuntu-release-notes
Status: New = Fix Released
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** Description changed:
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
** Summary changed:
- Duel screen greeter can break 3D acceleration
+ Dual screen greeter can break 3D acceleration
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Title:
Should we add something to the release notes? Maybe like this:
Some laptops or netbooks with older graphics can experience bad
graphical performance when starting with a high resolution external
monitor attached. The reason for this is that some graphics cards (like
the Intel 945GSE for example)
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