Public bug reported:
In most cases, 'xrandr --auto' does the Right Thing configuring the
avilable displays. However, after I have used the VGA output of my
laptop and return to use the HDMI output from my docking station, I get
this message:
% xrandr --auto
xrandr: cannot find crtc for output HDMI3
The setup look like this:
% xrandr
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis)
277mm x 156mm
1366x768 59.6*+
1360x768 59.8 60.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
VGA1 disconnected 1024x768+0+0 (normal left inverted right x axis y axis)
0mm x 0mm
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 (normal left inverted right x axis y axis)
1680x1050 59.9 +
1280x1024 75.0 60.0
1152x864 75.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
Note that VGA1 is disconnected, but configured with 1024x768.
Deconfiguring it works:
% xrandr --output VGA1 --off
% xrandr --auto
This isn't entirely obvious to figure out, and I think --auto should do
this (i.e. turn off unused displays to free a crtc) automatically. If
this is unacceptable for some reason, I suggest the error message should
be changed to be more informative, e.g. something like:
% xrandr --auto
xrandr: cannot find crtc for output HDMI3. VGA1 is currently configured
but disconnected, to free its crtc, use 'xrandr --output VGA1 --off'. To share
a crtc, configure HDMI3 with the same mode as a configured display.
(This is on a Lenovo X220, with Oneiric, but I believe many systems have
fewer crtcs than display connections)
** Affects: x11-xserver-utils (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
+ In most cases, 'xrandr --auto' does the Right Thing configuring the
+ avilable displays. However, after I have used the VGA output of my
+ laptop and return to use the HDMI output from my docking station, I get
+ this message:
- In most cases, 'xrandr --auto' does the Right Thing configuring the avilable
displays. However, after I have used the VGA output of my laptop and return to
use the HDMI output from my docking station, I get this message:
-
- % xrandr --auto
- xrandr: cannot find crtc for output HDMI3
+ % xrandr --auto
+ xrandr: cannot find crtc for output HDMI3
The setup look like this:
- % xrandr
- Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
- LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis)
277mm x 156mm
- 1366x768 59.6*+
- 1360x768 59.8 60.0
- 1024x768 60.0
- 800x600 60.3 56.2
- 640x480 59.9
- VGA1 disconnected 1024x768+0+0 (normal left inverted right x axis y axis)
0mm x 0mm
- 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 (normal left inverted right x axis y axis)
- 1680x1050 59.9 +
- 1280x1024 75.0 60.0
- 1152x864 75.0
- 1024x768 75.1 60.0
- 800x600 75.0 60.3
- 640x480 75.0 60.0
- 720x400 70.1
- DP2 disconnected (normal left inverted right x axis y axis)
- DP3 disconnected (normal left inverted right x axis y axis)
+ % xrandr
+ Screen 0: minimum 320 x 200, current 1366 x 768, maximum 8192 x 8192
+ LVDS1 connected 1366x768+0+0 (normal left inverted right x axis y axis)
277mm x 156mm
+ 1366x768 59.6*+
+ 1360x768 59.8 60.0
+ 1024x768 60.0
+ 800x600 60.3 56.2
+ 640x480 59.9
+ VGA1 disconnected 1024x768+0+0 (normal left inverted right x axis y axis)
0mm x 0mm
+ 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 (normal left inverted right x axis y axis)
+ 1680x1050 59.9 +
+ 1280x1024 75.0 60.0
+ 1152x864 75.0
+ 1024x768 75.1 60.0
+ 800x600 75.0 60.3
+ 640x480 75.0 60.0
+ 720x400 70.1
+ DP2 disconnected (normal left inverted right x axis y axis)
+ DP3 disconnected (normal left inverted right x axis y axis)
Note that VGA1 is disconnected, but configured with 1024x768.
Deconfiguring it works:
- % xrandr --output VGA1 --off
- % xrandr --auto
+ % xrandr --output VGA1 --off
+ % xrandr --auto
This isn't entirely obvious to figure out, and I think --auto should do
this (i.e. turn off unused displays to free a crtc) automatically. If
this is unacceptable for some reason, I suggest the error message should
be changed to be more informative, e.g. something like:
- % xrandr --auto
- xrandr: cannot find crtc for output HDMI3. VGA1 is currently configured
but disconnected, to free its crtc, use 'xrandr --output VGA1 --off'. To share
a crtc, configure HDMI3 with the same mode as a configured display.
+ % xrandr --auto
+ xrandr: cannot find crtc for output HDMI3. VGA1 is currently configured
but disconnected, to free its crtc, use 'xrandr --output VGA1 --off'. To share
a crtc, configure HDMI3 with the same mode as a configured display.
- (This is on a Lenovo X220, but I believe many systems have fewer crtcs
- than display connections)
+ (This is on a Lenovo X220, with Oneiric, but I believe many systems have
+ fewer crtcs than display connections)
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https://bugs.launchpad.net/bugs/907679
Title:
xrandr --auto should turn off disconnected displays to free crtcs
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