Red Hat Bugzilla – Bug 983386
External monitor connected with miniDP adapter gives wrong resolutions
Last modified: 2014-02-05 17:06:22 EST
Description of problem:
Wehn I connect an external monitor to my laptop with a MiniDipsplayPort adapter, it doesn't show all the available resolutions. The monitor supports 1920x1080 while xrandr reports up to 1024x768.
Version-Release number of selected component (if applicable):
Version : 2.21.8
Release : 1.fc18
Connect external screen to laptop with MiniDiplayPort adapter
Steps to Reproduce:
1. connect screen
2. try to set the resolution
Not all supported reolutions are shown
All supported resolutions should be available.
Laptop type : Dell XPS13 (sputnik project with Ubuntu)
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
eDP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 294mm x 165mm
1920x1080 60.0*+ 40.0
800x600 60.3 56.2
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
800x600 60.3 56.2
Dmesg shows this :
[ 642.088252] [drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving up
Some additional info:
When I initially installed F18, the screen could be used with the correct resolution.
current kernel : 3.9.6-200.fc18.x86_64
Output of monitor-edid
EISA ID: CMN1345
EDID version: 1.4
EDID extension blocks: 0
Screen size: 29.4 cm x 16.5 cm (13.27 inches, aspect ratio 16/9 = 1.78)
# Monitor preferred modeline (60.0 Hz vsync, 66.7 kHz hsync, ratio 16/9, 165 dpi)
ModeLine "1920x1080" 138.78 1920 1966 1996 2080 1080 1082 1086 1112 -hsync +vsync
# Monitor supported modeline (40.0 Hz vsync, 44.5 kHz hsync, ratio 16/9, 165 dpi)
ModeLine "1920x1080" 92.52 1920 1966 1996 2080 1080 1082 1086 1112 -hsync +vsync
I gave this another go since running Ubuntu is not really my thing. When I run this I can get the ecternal screen screen to work with the correct resolution
[root@localhost ~]# xrandr --newmode 1920x1080_ 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
[root@localhost ~]# xrandr --addmode DP1 1920x1080_
[root@localhost ~]# xrandr --output DP1 --mode 1920_1080_
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