Revert "modesetting: Only use GAMMA_LUT if its size is 1024"
This reverts commit 617f591f. The problem described in that commit exists, but the two preceeding commits with improvements to the servers RandR code should avoid the mentioned problems while allowing the use of GAMMA_LUT's instead of legacy gamma lut. Use of legacy gamma lut's is not a good fix, because it will reduce color output precision of gpu's with more than 1024 GAMMA_LUT slots, e.g., AMD, ARM MALI and KOMEDA with 4096 slot luts, and some Mediathek parts with 512 slot luts. On KOMEDA, legacy lut's are completely unsupported by the kms driver, so gamma correction gets disabled. The situation is especially bad on Intel Icelake and later: Use of legacy gamma tables will cause the kms driver to switch to hardware legacy lut's with 256 slots, 8 bit wide, without interpolation. This way color output precision is restricted to 8 bpc and any deep color / HDR output (10 bpc, fp16, fixed point 16) becomes impossible. The latest Intel gen gpu's would have worse color precision than parts which are more than 10 years old. Signed-off-by: Mario Kleiner <email@example.com>