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Question: How to turn one monitor off without freezeing the other?

My specs are below. I have two monitors. I want to turn my left monitor off, but when i run:

xrandr --output DVI-0 --off

my left monitor goes dark (as it should) and everything on my right monitor freeze and i can't click anything (I can only CTRL+ALT+F2 and reboot). I can move the mouse cursor on second monitor, but it seems like cinnamon is completely frozen.

I also tried turning left monitor off using display window from cinnamon, but the initial result is the same (cinnamon frozen) and after 30s, when cinnamon tries to restore the settings, monitor flickers and nothing actually is restored.

It was working some time ago, not sure when it stopped (maybe after some Mint update).

Any idea how to solve it? Thank you in advance for any tips.

System: System: Host: XXXXXXX Kernel: 4.4.0-112-generic x86_64 (64 bit) Desktop: Cinnamon 3.6.7 Distro: Linux Mint 18.3 Sylvia Machine: System: Dell product: OptiPlex 7010 v: 01 Mobo: Dell model: 0GY6Y8 v: A03 Bios: Dell v: A19 date: 08/18/2014 Graphics: Card-1: Advanced Micro Devices [AMD/ATI] Caicos XT [Radeon HD 7470/8470 / R5 235/310 OEM] Card-2: Advanced Micro Devices [AMD/ATI] Caicos XT [Radeon HD 7470/8470 / R5 235/310 OEM] Display Server: X.Org 1.18.4 drivers: ati,radeon (unloaded: fbdev,vesa) Resolution: 1280x1024@60.02hz, 1680x1050@59.95hz GLX Renderer: AMD CAICOS (DRM 2.43.0 / 4.4.0-112-generic, LLVM 5.0.0) GLX Version: 3.0 Mesa 17.2.4

Xrandr: Screen 0: minimum 320 x 200, current 2960 x 1050, maximum 16384 x 16384 DisplayPort-0 disconnected (normal left inverted right x axis y axis) DVI-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 338mm x 270mm 1280x1024 60.02*+ 75.02 1152x864 75.00 1024x768 75.08 60.00 800x600 75.00 60.32 640x480 75.00 60.00 720x400 70.08 DisplayPort-1-1 disconnected (normal left inverted right x axis y axis) DVI-1-1 connected primary 1680x1050+1280+0 (normal left inverted right x axis y axis) 473mm x 296mm 1680x1050 59.95*+ 1280x1024 75.02 60.02 1152x864 75.00 1024x768 75.08 60.00 800x600 75.00 60.32 640x480 75.00 60.00 720x400 70.08 1280x1024 (0x47) 135.000MHz +HSync +VSync h: width 1280 start 1296 end 1440 total 1688 skew 0 clock 79.98KHz v: height 1024 start 1025 end 1028 total 1066 clock 75.02Hz 1280x1024 (0x48) 108.000MHz +HSync +VSync h: width 1280 start 1328 end 1440 total 1688 skew 0 clock 63.98KHz v: height 1024 start 1025 end 1028 total 1066 clock 60.02Hz 1152x864 (0x49) 108.000MHz +HSync +VSync h: width 1152 start 1216 end 1344 total 1600 skew 0 clock 67.50KHz v: height 864 start 865 end 868 total 900 clock 75.00Hz 1024x768 (0x4a) 78.800MHz +HSync +VSync h: width 1024 start 1040 end 1136 total 1312 skew 0 clock 60.06KHz v: height 768 start 769 end 772 total 800 clock 75.08Hz 1024x768 (0x4b) 65.000MHz -HSync -VSync h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.36KHz v: height 768 start 771 end 777 total 806 clock 60.00Hz 800x600 (0x4c) 49.500MHz +HSync +VSync h: width 800 start 816 end 896 total 1056 skew 0 clock 46.88KHz v: height 600 start 601 end 604 total 625 clock 75.00Hz 800x600 (0x4d) 40.000MHz +HSync +VSync h: width 800 start 840 end 968 total 1056 skew 0 clock 37.88KHz v: height 600 start 601 end 605 total 628 clock 60.32Hz 640x480 (0x4e) 31.500MHz -HSync -VSync h: width 640 start 656 end 720 total 840 skew 0 clock 37.50KHz v: height 480 start 481 end 484 total 500 clock 75.00Hz 640x480 (0x4f) 25.200MHz -HSync -VSync h: width 640 start 656 end 752 total 800 skew 0 clock 31.50KHz v: height 480 start 490 end 492 total 525 clock 60.00Hz 720x400 (0x50) 28.320MHz -HSync +VSync h: width 720 start 738 end 846 total 900 skew 0 clock 31.47KHz v: height 400 start 412 end 414 total 449 clock 70.08Hz

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