I can confirm Nelux' observation. After turning this option off the
refresh rate stays the same when the unity greeter is launched. Maybe a
bug in Nvidia's driver?
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It works if you disable the DynamicTwinView option. You must edit the
file /etc/X11/xorg.con and add the following line in Section Screen:
Option DynamicTwinView False
Here is an emxample of my xorg.con:
Section Screen
Identifier Screen0
Device Device0
Monitor
I now installed and configured GDM as default DM and problem solved.
The problem is caused only LightDM.
Now do not come back at 60 Hz, runs at 85 hz. perfectly.
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It happens the same, although I set the screen at 85 Hz with nvidia-settings
after reboot always comes back to 60 hz.
In the xorg.conf file is correctly set to 85 hz. Please help, it is important
for those who have CRT monitors.
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klerfayt, your explanation doesn't make sense to me. Nevertheless I
tried to verify your advise but failed. It is still forced to 60Hz by
unity-greeter.
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@Eimann, the explanation is strictly for desktop settings, not login
screen
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https://bugs.launchpad.net/bugs/980680
Title:
login screen stuck at 60Hz with CRT monitor
To manage
The X server starts with the correct vertical refresh rate (according to
the log) and then it gets changed to 60 Hz as soon as the Unity greeter
shows up. It stays that way in the desktop session (which is XFCE4 in my
case) and I have to correct the refresh rate manually with Nvidia's
For desktop session try to change resolution in display settings from
higher to lower resolution and back to higher again. This should get you
higher refresh rate permanently.
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** Package changed: lightdm (Ubuntu) = unity-greeter (Ubuntu)
** Changed in: unity-greeter (Ubuntu)
Importance: Undecided = Low
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https://bugs.launchpad.net/bugs/980680
Title:
login
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: lightdm (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/980680
Title:
** Attachment added: xorg.conf
https://bugs.launchpad.net/bugs/980680/+attachment/3058227/+files/xorg.conf
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https://bugs.launchpad.net/bugs/980680
Title:
login screen stuck at 60Hz
** Attachment added: Xorg.0.log
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/980680/+attachment/3058229/+files/Xorg.0.log
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