Red Hat Bugzilla – Bug 447361
PreferredMode option in monitor section ignored in dual head setup
Last modified: 2009-07-14 13:30:12 EDT
Description of problem:
Trying to configure xrandr 1.2 based setup in xorg.conf is impossible because
one of the two 'PreferredMode' options is being ignored.
I'm have an ATI Technologies Inc Radeon R350 [Radeon 9800 Pro] rev 0 with the
I have two monitors attached, 1600x1200 on DVI-0 and 1280x1024 on VGA-0. If I
don't specify any preferred mode entries, I get 1400x1050 on both (arguably this
is itself a bug since this mode sux on both monitors).
If I specify 'Option "PreferredMode" "1280x1024"' on the 1280x1024, I get
1280x1024 on both monitors.
If I specify 'Option "PreferredMode" "1600x1200"' on the 1600x1200, I get
1600x1200 on the 1600x1200 monitor, and 1680x1050 on the 1280x1024 monitor.
If I specify both lines (each in the correct Monitor subsection), I get
1280x1024 on both monitors.
It's as though the PreferredMode line from the VGA-0 attached monitor is getting
copied over top of the PreferredMode of the DVI-0 attached monitor.
By using xrandr once X is started I can achieve exactly the configuration I'm
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.using ATI, configure different "PreferredMode" lines in each different Monitor
subsection, one will be ignored.
Xorg server attempts to use same mode on both monitors.
Xorg should obey the preferred mode set expliticly for each monitor separately.
Thanks for the bug report. We have reviewed the information you have provided
above, and there is some additional information we require that will be helpful
in our diagnosis of this issue.
Please attach your X server config file (/etc/X11/xorg.conf) and X server log
file (/var/log/Xorg.*.log) to the bug report as individual uncompressed file
attachments using the bugzilla file attachment link below.
Could you please also try to run without any /etc/X11/xorg.conf whatsoever and
let X11 autodetect your display and video card? Attach to this bug
/var/log/Xorg.0.log from this attempt as well, please.
We will review this issue again once you've had a chance to attach this information.
Thanks in advance.
Created attachment 307370 [details]
this xorg.conf attempts to set 1600x1200 (the native res.) on my 1600x1200 dvi
attached monitor, and 1280x1024 (the native res). on my 1280x1024 VGA attached
monitor. what I end up with is 1280x1024 on both.
see the next attachment for Xorg.0.log
Created attachment 307371 [details]
Xorg.0.log from startup with previously attached xorg.conf
log file starting X during previously attached xorg.conf file
Created attachment 307373 [details]
Xorg.0.log from startup without any xorg.conf present
here is the log starting up without any log. this results in a REALLY
UNDESIRABLE screen layout, 1400x1050 on both monitors. note that 1400x1050
exceeds the viewable area on my 1280x1024 monitor and some of that screen ends
up 'off-screen'. remember, my monitors are 1600x1200 LCD and 1280x1024 LCD.
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