Responsiveness: LightDM in ubuntu 12.04 very slow

might be duplicate of bugs #828112 and #838777

I'm not quite convinced this is a duplicate of those bugs. I have the same problem on all of my machines with:

---# lspci |grep VGA
00:02.0 VGA compatible controller: Intel Corporation 4 Series Chipset Integrated Graphics Controller (rev 03)

Sandy bridge GPUs on the other hand are smooth as butter:

---# lspci |grep VGA
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)

while the Intel cards in the middle are a little choppy:
---# lspci -v |grep VGA
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 12) (prog-if 00 [VGA controller])

Since this bug gets better with increasing graphics power, there is either a bug with the intel driver and lightdm/unity-greeter or the performance of unity-greeter needs optimizations for this case.

Marking the bug as confirmed. If you need any traces/logs for these graphics cards, I'm glad to be of assistance.

Status changed to 'Confirmed' because the bug affects multiple users.

I also have a Intel Corporation 4 Series Chipset Integrated Graphics Controller,and i do see a slow down with the mouse pointer,logging in and on the desktop it look's like the refresh rate is lowered,windows look choppy but this is only when the touch pad..but when i plugin a usb mouse the problem goes away..

Th slow down I'm experiencing is only on the lightdm screen.
We have pretty much all desktop environments installed (openbox, fluxbox, enlightenment, kde, gnome, lxde, xfce, unity, twm, evilwm, ...), which might be a contributing factor, with the list being quite large. With GDM, there are no such slow downs.

I removed lightdm and instlled GDM and I stil see mouse slow down with the touch pad but not the mouse,,i guess its a synaptics problem. its on a toshiba m305 laptop. I will try my acer 5315 latter in the day,before i file a new bug.

I don't know if it's Intel related. I have an ATI card and I'm experiencing the same.

harmen@doemaarwat:~$ lspci|grep VGA
01:05.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RS480 [Radeon Xpress 200G Series]

Same problem here with an older intel chip.
all UI Interactions in lightDM are painfully slow.

00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)

Experiencing slow response from both mouse and keyboard inputs in LightDM with Ubuntu 12.04 on x64.
CPU: Intel® Core™2 Duo CPU T7700 @ 2.40GHz × 2
Chipset: Intel GM965

After login, mouse and keyboard inputs are fine.

Same problem here (https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/995395)

$ lspci -v | grep VGA
02:00.0 VGA compatible controller: NVIDIA Corporation NV34 [GeForce FX 5200] (rev a1) (prog-if 00 [VGA controller])

I have this issue on a DELL vostro 1000 laptop (AMD) with ATI Radeon Xpress 200M.

I missed in the graphics card description in the duplicate Bug #995395 (but can't edit my post)

I think I may have found the cause of the problem, or a very similar one, at least. See bug #1005642

I have just upgraded from 10.04 to 12.04

My computer is almost unusable right now. I have to write at turtle speed. Otherwise half of the letters typed on the keyboard do not get written.

I have been using this computer with Ubuntu since about 5 years ago with no issues so far until today.

Hope a solution will be found soon. Otherwise I will have to revert back to a previous version.

After the upgrade from 11.10 to 12.04, the desktop was painfully slow, the lightdm process took 100% on a single core. Applying the workaround from bug #1005642 fixed the problem for me. Still, a very serious issue!

My hardware: HP xv6200 workstation with 4x Xeon 2.8 GHz, NVIDIA graphics.

This affects me and is a dealbreaker. Clicking on anything in the greeter (username, password field, shutdown) takes anywhere between 2 and 30 seconds.

My hardware: Dell Latitude d830; 00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) (rev 0c) (prog-if 00 [VGA controller])

The workaround from bug #1005642 does *not* appear to fix things for me.

Also affects me. Ubuntu 12.04.
01:05.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RS880 [Radeon HD 4200] (prog-if 00 [VGA controller])

Maybe XOrg can be downgraded to the version used in Ubuntu 11.10?

I found the problem causing most, if not all of the mouse problems on LightDM: The Ambiance and/or Radiance themes. To fix the problem, install the Ubuntu Tweak PPA "ppa:tualatrix/ppa", install Ubuntu Tweak, and go to Ubuntu Tweak<Tweaks<Login Settings. Change the GTK theme to Adwaita. If not installed, please install this theme in the Software Center.

Hope this solved all of your problems :)

is the issue happening only in the greeter? the same theme is used for the session...

(Patch)

The issue is only happening in the greeter, Sebastian.

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Please note that if a different greeter theme is used in LightDM, the lag issue also stops. Unity-Greeter needs to be handled by LightDM as a .conf file, not through the other stuff 12.04 currently has to control configuration. Every LightDM greeter I use that is controlled by a .conf file works perfectly fine, with no errors.

Patch containing necessary text files to insert into a virtual terminal.

I am still experiencing this bug in quantal with those package versions:

ii lightdm 1.3.3-0ubuntu5 i386 Display Manager
ii lightdm-gtk-greeter 1.3.1-0ubuntu1 i386 LightDM GTK+ Greeter

And the issue is still there in Precise (12.04)

Package: lightdm
Architecture: amd64
Version: 1.2.1-0ubuntu1.1

This bug has been fixed on my system by the lightdm 1.4.0 upload to quantal.

Thank you for the update and the fix!

I am sorry but I spoke too soon. This bug is back on my system. Sorry for the confusion!

I tested lightdm-gtk-greeter instead of unity-greeter. In /etc/lightdm/lightdm.conf my system now has:

greeter-session=lightdm-gtk-greeter

With this change the slowness is now gone. Therefore this bug seems to be in unity-greeter.