I have found a possible workaround.
For two days now I haven't had spontaneous monitor/resolution swithing, here's
what I have done.
Immediately after boot I launch terminal and do the following:
Vostro-3550:~$ xinput
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Logitech USB Optical Mouse id=12 [slave pointer (2)]
⎜ ↳ DualPoint Stick id=15 [slave pointer (2)]
⎜ ↳ AlpsPS/2 ALPS DualPoint TouchPad id=16 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Power Button id=9 [slave keyboard (3)]
↳ Sleep Button id=10 [slave keyboard (3)]
↳ Laptop_Integrated_Webcam_FHD id=11 [slave keyboard (3)]
↳ Dell Dell USB Entry Keyboard id=13 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=14 [slave keyboard (3)]
↳ Video Bus id=8 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Dell WMI hotkeys id=17 [slave keyboard (3)]
Vostro-3550:~$
Vostro-3550:~$ xinput disable 7
Vostro-3550:~$ xinput disable 8
Vostro-3550:~$ xinput disable 17
And that seems to do the trick.
I will do this every day now and will report back if it turns out that it
doesn't work.
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https://bugs.launchpad.net/bugs/1293425
Title:
[Dell Vostro 3550] Display resolution keeps switching with external
monitor connected
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