xrandr "cannot find mode" although mode is added and shows on xrandr
On newmode
, 1280x1024_60.00 is enclosed in double quotes, whereas on addmode
and output
it isn't. Use double quotes on those two commands too. At least, this is the correct syntax. An additional problem is that you are trying to add a mode to a disconnected port "VGA-0 disconnected (normal left inverted right x axis y axis)
" which won't work. The port has to be connected first.
Judging from what the post says, you're probably using an incorrect port though. Your VGA-0 port is for connecting an actual monitor through a 15-pin VGA connector.
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Aatlantise
Undergrad mathematician-physicist turned data analyst. Looking to explore computational linguistics. Ubuntu is my work and home environment.
Updated on September 18, 2022Comments
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Aatlantise over 1 year
I'm trying to use my tablet as an extended monitor for my laptop, following Prometheus's answer here.
I got to the point where I'm supposed to output the mode with VGA-0, but xrandr "cannot find mode."
$ gtf 1280 1024 60 # 1280x1024 @ 60.00 Hz (GTF) hsync: 63.60 kHz; pclk: 108.88 MHz Modeline "1280x1024_60.00" 108.88 1280 1360 1496 1712 1024 1025 1028 1060 -HSync +Vsync $ xrandr newmode "1280x1024_60.00" 108.88 1280 1360 1496 1712 1024 1025 1028 1060 -HSync +Vsync $ xrandr --addmode VGA-0 1280x1024_60.00
At this point, prompting
$ xrandr
returnsScreen 0: minimum 8 x 8, current 1366 x 768, maximum 16384 x 16384 VGA-0 disconnected (normal left inverted right x axis y axis) LVDS-0 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 194mm 1366x768 60.0*+ HDMI-0 disconnected (normal left inverted right x axis y axis) 1280x1024_60.00 (0x2a6) 108.9MHz h: width 1280 start 1360 end 1496 total 1712 skew 0 clock 63.6KHz v: height 1024 start 1025 end 1028 total 1060 clock 60.0Hz
So there is a mode called
1280x1024_60.00
. But now, trying to output that mode, I get$ xrandr --output VGA-0 --mode 1280x1024_60.00 xrandr: cannot find mode 1280x1024_60.00
Which I don't understand because it looks like
mode 1280x1024_60.00
has been successfully added.Any advice or comment is appreciated. Thanks in advance.
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Aatlantise almost 8 yearsGotcha. I guess I'll have to use another way. Thanks!