Red Hat Bugzilla – Bug 974930
2 same monitors - 2 different resolution lists
Last modified: 2015-02-17 10:36:18 EST
Description of problem:
I have 2 same monitors (HP LP2475w, 1980x1200). One is connected on HDMI and the other on DP. Both have automatically setted to the optimal resolution (1980x1200). But the possible resolutions between the differs.
Screen 0: minimum 320 x 200, current 3840 x 1200, maximum 8192 x 8192
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 546mm x 352mm
1920x1080 50.0 60.0
1920x1080i 50.0 60.1
1280x720 50.0 60.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0 59.9
DP2 connected 1920x1200+1920+0 (normal left inverted right x axis y axis) 546mm x 352mm
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
DP3 disconnected (normal left inverted right x axis y axis)
There are 2 reasons, that could cause this behaviour. The X-Server has a different algorithm for HDMI and DisplayPort or the 2 monitors returns different informations (2 different firmware versions of the monitors, see X.org.log.txt)
Version-Release number of selected component (if applicable):
Fedora 19 prerelease, 2013-06-17
Steps to Reproduce:
1. boot Fedora
2. xrandr in console or in system control/display(?) ("Monitore" in german)
display different possible resolutions
display the same possible resolutions
Created attachment 761951 [details]
I made an attempt: I swapped the 2 same monitors, so that now is the one monitor on displayport and the other on hdmi.
xrandr got the same results. On HDMI I got a longer resolution list then on displayport.
1. The firmware between the 2 same monitors seems to be equal.
2. Either the algorithm in xorg between HDMI and DisplayPort resolutions is different or the monitors have different resolution lists for the different port.
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