Comment 36 for bug 1870736

I have the same bug with fractional scaling for my Geforce 1660 Ti and 2K monitor.
The temporary solution from kitezila has worked for me too.

~$ xrandr --verbose
Screen 0: minimum 8 x 8, current 2560 x 1440, maximum 32767 x 32767
DP-2 connected primary 2560x1440+0+0 (0x1c1) normal (normal left inverted right x axis y axis) 597mm x 336mm
 Identifier: 0x1bf
 Timestamp: 178502
 Subpixel: unknown
 Gamma: 1.0:1.0:1.0
 Brightness: 1.0
 Clones:
 CRTC: 0
 CRTCs: 0 1 2 3
 Transform: 1.000000 0.000000 0.000000
             0.000000 1.000000 0.000000
             0.000000 0.000000 1.000000
            filter:
 _MUTTER_PRESENTATION_OUTPUT: 0
 CscMatrix: 65536 0 0 0 0 65536 0 0 0 0 65536 0
 EDID:
  00ffffffffffff0026cd3766db0b0000
  301d0104b53c2278fb0c95ab554ca024
  0d50542108009500a9c0a940b300d1c0
  d1cae1008180565e00a0a0a029503020
  350055502100001a000000ff00313135
  32313934383033303335000000fd0030
  4678781e010a202020202020000000fc
  00504c32373932510a202020202001c6
  020318f14b100504030201111213141f
  23090707830100004c6b0050a0a03050
  0820280855502100001a000000000000
  00000000000000000000000000000000
  00000000000000000000000000000000
  00000000000000000000000000000000
  00000000000000000000000000000000
  00000000000000000000000000000062
 BorderDimensions: 4
  supported: 4
 Border: 0 0 0 0
  range: (0, 65535)
 SignalFormat: DisplayPort
  supported: DisplayPort
 ConnectorType: DisplayPort
 ConnectorNumber: 2
 _ConnectorLocation: 2
 non-desktop: 0
  supported: 0, 1
  2560x1440 (0x1c0) 241.500MHz +HSync -VSync +preferred
        h: width 2560 start 2608 end 2640 total 2720 skew 0 clock 88.79KHz
        v: height 1440 start 1443 end 1448 total 1481 clock 59.95Hz
  2560x1440 (0x1c1) 274.680MHz +HSync -VSync *current
        h: width 2560 start 2568 end 2600 total 2640 skew 0 clock 104.05KHz
        v: height 1440 start 1474 end 1482 total 1488 clock 69.92Hz
  2048x1280 (0x1c2) 220.250MHz -HSync +VSync
        h: width 2048 start 2192 end 2408 total 2768 skew 0 clock 79.57KHz
        v: height 1280 start 1283 end 1289 total 1327 clock 59.96Hz
  1920x1080 (0x1c3) 204.250MHz -HSync +VSync
        h: width 1920 start 2056 end 2256 total 2592 skew 0 clock 78.80KHz
        v: height 1080 start 1083 end 1088 total 1127 clock 69.92Hz
  1920x1080 (0x1c4) 148.500MHz +HSync +VSync
        h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.50KHz
        v: height 1080 start 1084 end 1089 total 1125 clock 60.00Hz
  1920x1080 (0x1c5) 148.350MHz +HSync +VSync
        h: width 1920 start 2008 end 2052 total 2200 skew 0 clock 67.43KHz
        v: height 1080 start 1084 end 1089 total 1125 clock 59.94Hz
  1920x1080 (0x1c6) 148.500MHz +HSync +VSync
        h: width 1920 start 2448 end 2492 total 2640 skew 0 clock 56.25KHz
        v: height 1080 start 1084 end 1089 total 1125 clock 50.00Hz
  1680x1050 (0x1c7) 146.250MHz -HSync +VSync
        h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.29KHz
        v: height 1050 start 1053 end 1059 total 1089 clock 59.95Hz
  1600x1200 (0x1c8) 162.000MHz +HSync +VSync
        h: width 1600 start 1664 end 1856 total 2160 skew 0 clock 75.00KHz
        v: height 1200 start 1201 end 1204 total 1250 clock 60.00Hz
  1600x900 (0x1c9) 108.000MHz +HSync +VSync
        h: width 1600 start 1624 end 1704 total 1800 skew 0 clock 60.00KHz
        v: height 900 start 901 end 904 total 1000 clock 60.00Hz
  1440x900 (0x1ca) 106.500MHz -HSync +VSync
        h: width 1440 start 1520 end 1672 total 1904 skew 0 clock 55.93KHz
        v: height 900 start 903 end 909 total 934 clock 59.89Hz
  1280x1024 (0x1cb) 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
  1280x720 (0x1cc) 74.180MHz +HSync +VSync
        h: width 1280 start 1390 end 1430 total 1650 skew 0 clock 44.96KHz
        v: height 720 start 725 end 730 total 750 clock 59.94Hz
  1280x720 (0x1cd) 74.250MHz +HSync +VSync
        h: width 1280 start 1720 end 1760 total 1980 skew 0 clock 37.50KHz
        v: height 720 start 725 end 730 total 750 clock 50.00Hz
  1024x768 (0x1ce) 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 (0x1cf) 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
  720x576 (0x1d0) 27.000MHz -HSync -VSync
        h: width 720 start 732 end 796 total 864 skew 0 clock 31.25KHz
        v: height 576 start 581 end 586 total 625 clock 50.00Hz
  720x480 (0x1d1) 27.000MHz -HSync -VSync
        h: width 720 start 736 end 798 total 858 skew 0 clock 31.47KHz
        v: height 480 start 489 end 495 total 525 clock 59.94Hz
  640x480 (0x1d2) 25.175MHz -HSync -VSync
        h: width 640 start 656 end 752 total 800 skew 0 clock 31.47KHz
        v: height 480 start 490 end 492 total 525 clock 59.94Hz
  640x480 (0x1d3) 25.170MHz -HSync -VSync
        h: width 640 start 656 end 752 total 800 skew 0 clock 31.46KHz
        v: height 480 start 490 end 492 total 525 clock 59.93Hz