Comment 85 for bug 1313170

xrandr --verbose
(relevant monitor) - if you not already have this information:
VGA-1-2 connected (normal)
 Identifier: 0x41
 Timestamp: 22568
 Subpixel: unknown
 Clones:
 CRTCs: 3 4
 Transform: 1.000000 0.000000 0.000000
             0.000000 1.000000 0.000000
             0.000000 0.000000 1.000000
            filter:
 scaling mode: None
  supported: None, Full, Center, Full aspect
 color vibrance: 150
  range: (0, 200)
 vibrant hue: 90
  range: (0, 180)
  1024x768 (0x43) 65.0MHz -HSync -VSync
        h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.4KHz
        v: height 768 start 771 end 777 total 806 clock 60.0Hz
  800x600 (0x44) 40.0MHz +HSync +VSync
        h: width 800 start 840 end 968 total 1056 skew 0 clock 37.9KHz
        v: height 600 start 601 end 605 total 628 clock 60.3Hz
  800x600 (0x45) 36.0MHz +HSync +VSync
        h: width 800 start 824 end 896 total 1024 skew 0 clock 35.2KHz
        v: height 600 start 601 end 603 total 625 clock 56.2Hz
  848x480 (0x46) 33.8MHz +HSync +VSync
        h: width 848 start 864 end 976 total 1088 skew 0 clock 31.0KHz
        v: height 480 start 486 end 494 total 517 clock 60.0Hz
  640x480 (0x47) 25.2MHz -HSync -VSync
        h: width 640 start 656 end 752 total 800 skew 0 clock 31.5KHz
        v: height 480 start 489 end 492 total 525 clock 59.9Hz
  1024x768 (0x43) 65.0MHz
        h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.4KHz
        v: height 768 start 771 end 777 total 806 clock 60.0Hz
  800x600 (0x44) 40.0MHz
        h: width 800 start 840 end 968 total 1056 skew 0 clock 37.9KHz
        v: height 600 start 601 end 605 total 628 clock 60.3Hz
  800x600 (0x45) 36.0MHz
        h: width 800 start 824 end 896 total 1024 skew 0 clock 35.2KHz
        v: height 600 start 601 end 603 total 625 clock 56.2Hz