Dear OpenBSD users, I run OpenBSD 6.2 amd64 on a Dell Latitude E6540 laptop.
I hook a Dell U2412M monitor to the laptop using VGA port. xrandr recognizes the maximum resolution of the external monitor, but the refresh rate is slightly below 60: VGA-1 connected (normal left inverted right x axis y axis) 1920x1200 59.95 + 1920x1080 60.00 1600x1200 60.00 1680x1050 59.95 1280x1024 60.02 1280x960 60.00 1024x768 60.00 800x600 60.32 640x480 60.00 720x400 70.08 I can visibly see the flickering of the screen on the external monitor. Is this because the refresh rate is below 60? At the back of the monitor, a label states that the monitor supports a resolution of 1920x1200 at 60 refresh rate. I tried to use xrandr to adjust refresh rate. I ran $ gtf 1920 1200 60 The output is: # 1920x1200 @ 60.00 Hz (GTF) hsync: 74.52 kHz; pclk: 193.16 MHz Modeline "1920x1200_60.00" 193.16 1920 2048 2256 2592 1200 1201 1204 1242 -HSync +Vsync $ nice -n 20 xrandr --newmode "1920x1200_60.00" Modeline "1920x1200_60.00" 193.16 1920 2048 2256 2592 1200 1201 1204 1242 -HSync +Vsync $ xrandr --addmode VGA-1 1920x1200_60.00 $ xrandr --output VGA-1 --mode 1920x1200_60.00 Then the entire laptop freezes. The keyboard is not responding, nor is the mouse or touchpad. The system is somehow running though, as the system gracefully shuts down when I press the power button. Do you have experience with setting up refresh rate on an external monitor? Yours sincerely, Xianwen
