Did you try this way?
Thank you very much. (I am sure that I have to study the manual more thoroughly^^)
PatchVBios gave me a higher resolution, but Clover didn't use the whole screen and still with some black space around boot screen. So I tried several combinations using InjectEDID, LoadVBios, and GraphicsInjector options. But same result.
My LCD is SyncMastr TA531
(27 inch, max. res. 1920x1080)
Looking at preboot.log, these lines are seen.
4:775 0:000 Available graphics modes for refit.conf screen_resolution:
4:775 0:000 Curr. Mode = 4, Modes = 6, FB = E9000000, FB size=0xE00000
4:775 0:000 - Mode 0: 640x480 PixFmt = 8bit BGR, PixPerScanLine = 640
4:775 0:000 - Mode 1: 800x600 PixFmt = 8bit BGR, PixPerScanLine = 800
4:775 0:000 - Mode 2: 1024x768 PixFmt = 8bit BGR, PixPerScanLine = 1024
4:775 0:000 - Mode 3: 1280x1024 PixFmt = 8bit BGR, PixPerScanLine = 1280
4:775 0:000 - Mode 4: 1920x1080 PixFmt = 8bit BGR, PixPerScanLine = 1920
4:775 0:000 - Mode 5: 1280x800 PixFmt = 8bit BGR, PixPerScanLine = 1280
4:775 0:000 SetScreenResolution: 1920x1080 - already set
4:998 0:223 Found Mouse device:
4:998 0:000 - ResolutionX=8
4:998 0:000 - ResolutionY=8
4:998 0:000 - ResolutionZ=8
4:998 0:000 - Left button present
4:998 0:000 - Right button present
5:001 0:003 GUI ready
Before VBios patch, I couldn't see Mode4 above.
One strange thing. My second LCD is 22 inch (SyncMaster 223BW
) with max resolution 1680x1050.
When I tried this display as main with 1680x1050 in refit.conf, it didn't work.
But with 1280x1024, Clover used the full screen without any extra black space.