My system have two monitors connected to my system. My xorg.conf starts VGA-0 to the left of DVI-A-0. Both starts at resolution 1280x1024 by default (not changed by me). VGA-0 is capable of running the resolution 1600x1200, but here comes the problem: xake@lillen ~ $ xrandr --output VGA-0 --mode 1600x1200 xake@lillen ~ $ xrandr Screen 0: minimum 320 x 200, current 2560 x 1200, maximum 3000 x 3000 VGA-0 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 352mm x 264mm 1280x1024 85.0 + 84.8 75.0 1600x1200 75.0* 1152x864 75.0 1024x768 100.0 84.9 75.1 70.1 60.0 43.5 832x624 74.6 800x600 84.9 72.2 75.0 60.3 56.2 640x480 84.6 75.0 72.8 66.7 60.0 720x400 87.8 70.1 DVI-A-0 connected 1280x1024+1280+0 (normal left inverted right x axis y axis) 306mm x 230mm 1280x1024 60.1* 1024x768 75.1 70.1 60.0 43.5 832x624 74.6 800x600 72.2 75.0 60.3 56.2 640x480 75.0 72.8 66.7 60.0 59.9 720x400 87.8 70.1 512x384 120.0 400x300 120.6 320x240 120.1 DVI-D-0 disconnected (normal left inverted right x axis y axis) As you can see in this output the "current" for "Screen 0" is less then the width of VGA-0 and DVI-A-0 making a part of the left screen also appere on the right. However if I do: xake@lillen ~ $ xrandr Screen 0: minimum 320 x 200, current 2560 x 1200, maximum 3000 x 3000 VGA-0 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 352mm x 264mm 1280x1024 85.0 + 84.8 75.0 1600x1200 75.0* 1152x864 75.0 1024x768 100.0 84.9 75.1 70.1 60.0 43.5 832x624 74.6 800x600 84.9 72.2 75.0 60.3 56.2 640x480 84.6 75.0 72.8 66.7 60.0 720x400 87.8 70.1 DVI-A-0 connected 1280x1024+1280+0 (normal left inverted right x axis y axis) 306mm x 230mm 1280x1024 60.1* 1024x768 75.1 70.1 60.0 43.5 832x624 74.6 800x600 72.2 75.0 60.3 56.2 640x480 75.0 72.8 66.7 60.0 59.9 720x400 87.8 70.1 512x384 120.0 400x300 120.6 320x240 120.1 DVI-D-0 disconnected (normal left inverted right x axis y axis) xake@lillen ~ $ xrandr --output DVI-A-0 --off xake@lillen ~ $ xrandr --output DVI-A-0 --auto xake@lillen ~ $ xrandr --output DVI-A-0 --right-of VGA-0 xake@lillen ~ $ xrandr --output DVI-A-0 --mode 1280x1024 xake@lillen ~ $ xrandr Screen 0: minimum 320 x 200, current 2880 x 1200, maximum 3000 x 3000 VGA-0 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 352mm x 264mm 1280x1024 85.0 + 84.8 75.0 1600x1200 75.0* 1152x864 75.0 1024x768 100.0 84.9 75.1 70.1 60.0 43.5 832x624 74.6 800x600 84.9 72.2 75.0 60.3 56.2 640x480 84.6 75.0 72.8 66.7 60.0 720x400 87.8 70.1 DVI-A-0 connected 1280x1024+1600+0 (normal left inverted right x axis y axis) 306mm x 230mm 1280x1024 60.1* 1024x768 75.1 70.1 60.0 43.5 832x624 74.6 800x600 72.2 75.0 60.3 56.2 640x480 75.0 72.8 66.7 60.0 59.9 720x400 87.8 70.1 512x384 120.0 400x300 120.6 320x240 120.1 DVI-D-0 disconnected (normal left inverted right x axis y axis) Then as you can see everything works nice. So it seems changing the resolution the output of VGA-0 (theleft screen) does not setup a correct screen size, but with xrandr turn off DVI-A-0 and restore its setup again both monitors seems to work nice.
Created attachment 16234 [details] Xorg.log Forgot to add the details of my card: 01:00.0 VGA compatible controller [0300]: nVidia Corporation NV31 [GeForce FX 5600] [10de:0312] (rev a1) (prog-if 00 [VGA controller]) Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 32 (1250ns min, 250ns max) Interrupt: pin A routed to IRQ 18 Region 0: Memory at f8000000 (32-bit, non-prefetchable) [size=16M] Region 1: Memory at e0000000 (32-bit, prefetchable) [size=256M] [virtual] Expansion ROM at f9000000 [disabled] [size=128K] Capabilities: [60] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Capabilities: [44] AGP version 3.0 Status: RQ=32 Iso- ArqSz=0 Cal=3 SBA+ ITACoh- GART64- HTrans- 64bit- FW+ AGP3+ Rate=x4,x8 Command: RQ=32 ArqSz=2 Cal=0 SBA+ AGP+ GART64- 64bit- FW+ Rate=x8
I'm wondering if this should be closed with NOTABUG or NOTOURBUG. It's certainly not our bug, because the driver is doing precisely what xrandr tells you. Secondly you may actually be getting what you ask for, but maybe not what you want. - You put the monitors into 1280x1024 and put one right of the other, at that point the coordinate reference of the 2nd monitor is fixed. Then you increase the other to 1600x1200, but never ask for a new position of the 2nd one. - Wether this is desirable beheaviour is something different all together.
He, I guess you are right. This seems like a NOTABUG since as you said xrandr did what I told it to do. Then that xrandr as a screen manipulating tool can be becuse of that somewhat confusing, that is another story for another day.
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