Red Hat Bugzilla – Bug 446189
Cannot set proper resolution with dual head
Last modified: 2018-04-11 07:56:49 EDT
Description of problem:
When connecting an external monitor to my laptop (in order to use the "clone"
mode), I'm unable to set proper resolution on it (1680x1050) -- it starts with
1024x768. This has worked in F8 (see my xorg.conf_f8). I managed to tweak the
xorg.conf a bit, so that I have at least 1200x960 (see xorg.conf_f9, Xorg.0.log)
-- am I doing something wrong?
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. connect the external monitor
2. boot up
It starts with 1024x768 (with xorg.conf_f8) or 1200x960 (with xorg.conf_f9) on
the external monitor.
It should start with 1680x1050 on the external monitor, as does F8 (with
Created attachment 305231 [details]
xorg.conf used (and working fine) in F8
Created attachment 305232 [details]
xorg.conf in F9 (The best I've managed in F9)
Created attachment 305233 [details]
Log file when using xorg.conf_f9
Could you try to set up your dual head with gnome-display-properties (from the
control-center package)? If it doesn't work for you, could you to restart x
without any /etc/X11/xorg.conf and try again, please?
Thanks for filing the bug
1) gnome-display-properties: When checking the "mirroring" box, I can choose
only 1024x768 for both displays from the combobox. Otherwise I can choose proper
resolutions for both displays. But in both cases clicking on "Apply" doesn't
seem to take any effect (neither the dialog closes, nor anything is written into
2) Starting without xorg.conf results in having 1024x768.
Thanks in advance!
As a workaround, after login I can set proper resolution by:
"xrandr --size 1680x1050"
However, I can't use the --output parameter to set this resolution only on the
external monitor (when trying --output LVDS/VGA --size 1680x1050 it doesn't have
As a side-effect, when using "xrandr --size 1680x1050", the laptop monitor goes
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