Custom Resolution Utility (CRU)
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12-26-2015, 11:39 PM
(Last edited: 12-27-2015, 05:43 PM by zamar19)
Post: #1901
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RE: Custom Resolution Utility (CRU)
@ToastyX
Quote:Screenshots represent the pixel data, not the (card) output.What do you mean? Also, how a GPU driver can determine monitor color depth choice supported at given resolution, if color bit depth is stated "undefined" in EDID? Quote:Why do you think EDID overrides aren't working?It was the wrong assumption. I checked again, and 4 options are available for this monitor at 1080P, but only 2 RGB options at 4K in FirePro CC. Quote:CRU does not convert the EDID version, and neither does Windows.Indeed, with the option ticked "Import complete EDID", CRU imports bin and exports inf without conversion. But when the exported EDID v1.4 is written to Registry by successfully installing via Device Manager with Sig Control off, upon reboot the newly installed override when exported from Registry shows EDID v1.3 and no YCbCr 4:4:4 in base section in Notepad++. I deleted all other hidden monitors, so no other display profiles are shown in Registry. If I save the imported bin in CRU by pressing OK (its presumably saved in Registry), and then restart the driver by running restart64.exe, Windows creates a new Generic Monitor profile without Override keys in Reg, but upon reboot the old profile with updated by CRU override section is used instead, and its again EDID v1.3 instead of v1.4. Quote:Maybe it can only display 4:4:4 at 3840x2160 @ 60 Hz with HDMI 2.0, or maybe it can't display 4:4:4 at all.I tried the test image at 1080P resolution with Just Scan option turned On in the TV Setup GUI. With that option, a 1080P reso desktop is shown centered at native 4K TV reso, but occupies only 1/4th of the entire TV screen as it should (of 4k or 4k UHD native screen?) without scaling to fit. The test image at 100% zoom shows both values equally clear 4:2:2 and 4:4:4 as on this photo, which was scaled down for upload in an image viewer, but shows exactly what I see on screen regardless of RGB or YCbCr 4:4:4 output selected. How to interpret it? Can it mean that at 1080P native reso, the LCD controller converts any incoming signals to 4:2:0, and the test image is confused? In 4K reso it only shows 4:2:2, and on another 1080P monitor only 4:4:4, but not both values at once. Quote:I don't think there's anything you can do about this.How likely Seiki to enable 4:4:4 in firmware owing to customers outcry? Is it competition driven of 4K TVs versus 4K monitors? I think so, since any HDMI2.0 rev B or A port must support 4K@60Hz 8bpc 4:4:4 signal as per HDMI2.0 standard. On a relevant note... Can you suggest any tool or method that would ID the DP version (1.1 or 1.2) and profile (HBR or HBR2) used in my V4900 card, or measure max DP throughput? Can I flash GPU BIOS to upgrade the DP profile? AMD site says its v1.2, but Dell spec says its DP (no version given, but V1.1 means twice lower bandwidth limit). The card 800 MHz engine clock seems to allow driving at least one 4K@60Hz 8bpc 4:4:4 display. |
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