Hm. Curious. Based on the EDID data supplied, you only have a single real mode
in there. And nouveau has logic to enable scaling in such cases. However it
only checks for DRM_MODE_TYPE_DRIVER, but should probably check USERDEF in
there as well? I don't know that logic too well.

---

EDID version: 1.4
Manufacturer: APP Model a022 Serial Number 0
Made in week 4 of 2013
Digital display
8 bits per primary color channel
DisplayPort interface
Maximum image size: 33 cm x 21 cm
Gamma: 2.20
Supported color formats: RGB 4:4:4
First detailed timing includes the native pixel format and preferred refresh
rate
Display x,y Chromaticity:
  Red:   0.6533, 0.3339
  Green: 0.2998, 0.6201
  Blue:  0.1464, 0.0498
  White: 0.3125, 0.3291
Established timings supported:
Standard timings supported:
Detailed mode: Clock 337.750 MHz, 331 mm x 207 mm
               2880 2928 2960 3040 hborder 0
               1800 1803 1809 1852 vborder 0
               +hsync -vsync 
               VertFreq: 59 Hz, HorFreq: 111101 Hz
Monitor name: Color LCD
Dummy block
Dummy block
Checksum: 0xde (valid)