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
is not a low end hardware issue.
[quote]
description: Motherboard
product: Z590 AORUS ELITE AX
vendor: Gigabyte Technology Co., Ltd.
description: VGA compatible controller
product: TU116 [GeForce GTX 1660 Ti]
vendor: NVIDIA Corporation
description: System Memory
physical id: 3b
slot: System board or motherboard
size: 32GiB
description: DIMM DDR4 Synchronous 2133 MHz (0.5 ns)
product: CMK32GX4M2D3600C18
description: CPU
product: 11th Gen Intel(R) Core(TM) i9-11900K @ 3.50GHz
[/quote]
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to unity-greeter in Ubuntu.
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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