https://bugs.freedesktop.org/show_bug.cgi?id=108997
--- Comment #3 from Mingcong Bai jeffbai@aosc.io --- The EDID data (obtained from Xorg.0.log output and attached above) also suggests that such mode is possible (unless I misunderstood something).
mingcongbai@NetVista [ / ] $ cat edid.bin | edid-decode EDID version: 1.2 Manufacturer: SAM Model 4db9 Serial Number 1346842937 Analog display, Input voltage level: 0.7/0.3 V Sync: Separate Composite SyncOnGreen Serration Maximum image size: 36 cm x 27 cm Gamma: 2.28 DPMS levels: Standby Suspend Off RGB color display First detailed timing is preferred timing Supports GTF timings within operating range Display x,y Chromaticity: Red: 0.6376, 0.3251 Green: 0.2763, 0.5957 Blue: 0.1425, 0.0664 White: 0.2832, 0.2978 Established timings supported: 720x400@70Hz 9:5 HorFreq: 31469 Hz Clock: 28.320 MHz 720x400@88Hz 9:5 HorFreq: 39500 Hz Clock: 35.500 MHz 640x480@60Hz 4:3 HorFreq: 31469 Hz Clock: 25.175 MHz 640x480@67Hz 4:3 HorFreq: 35000 Hz Clock: 30.240 MHz 640x480@72Hz 4:3 HorFreq: 37900 Hz Clock: 31.500 MHz 640x480@75Hz 4:3 HorFreq: 37500 Hz Clock: 31.500 MHz 800x600@56Hz 4:3 HorFreq: 35200 Hz Clock: 36.000 MHz 800x600@60Hz 4:3 HorFreq: 37900 Hz Clock: 40.000 MHz 800x600@72Hz 4:3 HorFreq: 48100 Hz Clock: 50.000 MHz 800x600@75Hz 4:3 HorFreq: 46900 Hz Clock: 49.500 MHz 832x624@75Hz 4:3 HorFreq: 49726 Hz Clock: 57.284 MHz 1280x768i@87Hz 5:3 HorFreq: 35522 Hz Clock: 44.900 MHz 1024x768@60Hz 4:3 HorFreq: 48400 Hz Clock: 65.000 MHz 1024x768@70Hz 4:3 HorFreq: 56500 Hz Clock: 75.000 MHz 1024x768@75Hz 4:3 HorFreq: 60000 Hz Clock: 78.750 MHz 1280x1024@75Hz 5:4 HorFreq: 80000 Hz Clock: 135.000 MHz 1152x870@75Hz 192:145 HorFreq: 67500 Hz Clock: 108.000 MHz Standard timings supported: 640x480@85Hz 4:3 HorFreq: 43300 Hz Clock: 36.000 MHz 800x600@85Hz 4:3 HorFreq: 53700 Hz Clock: 56.250 MHz 1024x768@85Hz 4:3 HorFreq: 68700 Hz Clock: 94.500 MHz 1280x1024@85Hz 5:4 HorFreq: 91100 Hz Clock: 157.500 MHz 1600x1200@75Hz 4:3 HorFreq: 93800 Hz Clock: 202.500 MHz 1024x768@100Hz 4:3 Detailed mode: Clock 157.500 MHz, 352 mm x 264 mm 1280 1344 1504 1728 hborder 0 1024 1025 1028 1072 vborder 0 +hsync +vsync VertFreq: 85 Hz, HorFreq: 91145 Hz Monitor ranges (GTF): 50-160Hz V, 30-96kHz H, max dotclock 210MHz Monitor name: S/M 900SL Serial number: H3NN105750 Checksum: 0xe0 (valid)