oneself
Tux's lil' helper
Joined: 02 Jul 2005
Posts: 107
Location: New York, NY
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 Posted: Thu Nov 20, 2014 1:53 am Post subject: Force Monitor Refresh Rate |
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Hi,
I'm using a Lenovo X230 laptop with an external LG-34UC97-S monitor. I've turn off the internal monitor and hooked up the external via HDMI. Looking at the user manual, native resolution and refresh rate which should be 3440x1440 50Hz (page 29). However, the monitor is currently running at 3440x1440 29.99Hz, for some reason. I've tried adding 50Hz as follows:
| Code: | $ xrandr
Screen 0: minimum 320 x 200, current 3440 x 1440, maximum 8192 x 8192
LVDS1 connected (normal left inverted right x axis y axis)
1366x768 60.02 +
1360x768 59.80 59.96
1024x768 60.00
800x600 60.32 56.25
640x480 59.94
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 connected 3440x1440+0+0 (normal left inverted right x axis y axis) 800mm x 335mm
3440x1440 29.99*
2560x1080 60.00
1920x1080 59.99 60.00 59.94
1680x1050 59.88
1600x900 59.98
1280x1024 60.02
1280x800 59.91
1152x864 59.97
1280x720 60.00 59.94
1024x768 60.00
800x600 60.32
720x480 60.00 59.94
640x480 60.00 59.94
HDMI3 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
$ cvt 3440 1440 50
# 3440x1440 49.96 Hz (CVT) hsync: 74.14 kHz; pclk: 344.00 MHz
Modeline "3440x1440_50.00" 344.00 3440 3672 4040 4640 1440 1443 1453 1484 -hsync +vsync
$ xrandr --newmode "3440x1440_50.00" 344.00 3440 3672 4040 4640 1440 1443 1453 1484 -hsync +vsync
$ xrandr --verbose --addmode HDMI2 "3440x1440_50.00"
$ xrandr
Screen 0: minimum 320 x 200, current 3440 x 1440, maximum 8192 x 8192
LVDS1 connected (normal left inverted right x axis y axis)
1366x768 60.02 +
1360x768 59.80 59.96
1024x768 60.00
800x600 60.32 56.25
640x480 59.94
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 connected 3440x1440+0+0 (normal left inverted right x axis y axis) 800mm x 335mm
3440x1440 29.99*
2560x1080 60.00
1920x1080 59.99 60.00 59.94
1680x1050 59.88
1600x900 59.98
1280x1024 60.02
1280x800 59.91
1152x864 59.97
1280x720 60.00 59.94
1024x768 60.00
800x600 60.32
720x480 60.00 59.94
640x480 60.00 59.94
3440x1440_50.00 49.96
HDMI3 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
$ xrandr --output HDMI2 --mode "3440x1440_50.00"
xrandr: Configure crtc 1 failed
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I'm guessing that the modeline returned by cvt is wrong, but I'm not sure how to get the right one. Any help would be appreciated.
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