Custom Resolution Utility (CRU)

[ToastyX]

(11-18-2025 08:35 PM)Dave Camz Wrote:  Hi there, great bit of software. htz issue 2 x g5 165 1 x 144 for triples, i sorted in correction software fine set to all 144 and nvid surround was perfect and able to set all at 144 which is brilliant, when shut pc down it all went back to normal and only 120htz to choose, any idea what i should of done for it all to save. i have reset all again had to unplug 2 monitors to force surround out of enable cos i couldn't disable it, but back now but haven't switched pc off yet again to check, looking for a solution, thank you

Try disabling fast startup: https://support.lenovo.com/us/en/solutio...ndows-1081

[UnclWish]

(11-19-2025 10:28 PM)ToastyX Wrote:  FreeSync should not affect colors. The monitor is designed badly.

I'm a bit confused. Some sites says that this Samsung G5 C27G55T even hasn't FRC and only 8 bit. But Samsung says that it can 10 bit. Some sources says that this monitor gives 10 bit due to GPU dithering.

If I have 10 bit option in AMD settings panel, what this mean? CRU detect that monitor have maximum color depth 30-bit (10 bpc). Have monitor FRC or not? How it can do 10 bit with 8 bit matrix w/o FRC?

And why GPU dithering not works with FreeSync?

Sorry for my incompetence.

[Dave Camz]

Hi, i did try the fast start up option but didnt work either. only way i can figure out at mo is disable surround before shut down the enable surround when started, noy ideal but seems to work until a solution.

[ToastyX]

(11-21-2025 06:21 PM)Dave Camz Wrote:  Hi, i did try the fast start up option but didnt work either. only way i can figure out at mo is disable surround before shut down the enable surround when started, noy ideal but seems to work until a solution.

You should report the issue to NVIDIA because it's a bug in their driver. I can't do anything about it.

[ToastyX]

(11-20-2025 12:20 PM)UnclWish Wrote:  I'm a bit confused. Some sites says that this Samsung G5 C27G55T even hasn't FRC and only 8 bit. But Samsung says that it can 10 bit. Some sources says that this monitor gives 10 bit due to GPU dithering.

If I have 10 bit option in AMD settings panel, what this mean? CRU detect that monitor have maximum color depth 30-bit (10 bpc). Have monitor FRC or not? How it can do 10 bit with 8 bit matrix w/o FRC?

And why GPU dithering not works with FreeSync?

10 bpc means the monitor will accept a 10 bpc signal. It doesn't mean the monitor will handle it correctly. FreeSync should not affect colors or FRC.

[Apophis06]

Does anyone know if CRU works with Snapdragon X Elite Adreno Graphics? The program works runs but no new resolutions are being shown by windows after restart/reboot. I saw that someone mentioned a few years ago that the Adreno drivers don't allow for this type of stuff but I wanted to know if that has changed at all recently.

[ToastyX]

(11-22-2025 04:13 AM)Apophis06 Wrote:  Does anyone know if CRU works with Snapdragon X Elite Adreno Graphics? The program works runs but no new resolutions are being shown by windows after restart/reboot. I saw that someone mentioned a few years ago that the Adreno drivers don't allow for this type of stuff but I wanted to know if that has changed at all recently.

No, the driver needs to support EDID overrides.

[djsolidsnake86]

there is a way for restart only hdmi audio?
when i use a hdmi switch from tv to tv happen that audio wont refresh and remember the tv not active

[ToastyX]

(11-27-2025 03:03 PM)djsolidsnake86 Wrote:  there is a way for restart only hdmi audio?
when i use a hdmi switch from tv to tv happen that audio wont refresh and remember the tv not active

Try disabling and then enabling the sound device in Device Manager.

[EeK]

Hi @ToastyX,

I’ve been using CRU for a long time (thanks for creating such an amazing tool) - initially to remove higher-than-4K resolutions from my LG OLED TVs.

I recently upgraded to a Samsung S90F OLED TV, which adds the issue of reporting incorrect audio formats (resulting in the loss of 7.1 surround and Atmos when the TV passes audio to my AVR via eARC).

Naturally, I used CRU to fix this and ran into the Nvidia driver behavior where EDID overrides are ignored when DSC is engaged. The S90F supports 3840×2160 @ 144 Hz only with DSC when using RGB Full 10-bit, so I limited it to 3840×2160 @ 120 Hz and added the necessary audio formats - these ones, copied from my Denon AVR-X4400H (the linked image is part of a tutorial I wrote for AVS Forum).

Everything worked perfectly except for Atmos. I always get 7.1, and the correct encoded formats (Dolby Digital Plus, Dolby TrueHD and Dolby Digital - Samsung doesn't support DTS formats) consistently appear under Supported Formats, but Dolby Atmos for Home Theater only showed up twice.

I was able to trigger Atmos only immediately after restarting the GPU driver following the EDID change, and once more after unplugging/re-plugging the HDMI cable. In both cases, the option disappeared again on the next reboot. I haven’t found a reliable way to make it reappear, and I don’t want to risk damaging the GPU’s HDMI port by repeatedly unplugging and reconnecting the cable.

Do you have any idea what might be causing this or know of any possible fixes/workarounds? I’d love to keep Atmos support without having to run a second HDMI cable from the GPU to the AVR and deal with all the complications of using a secondary display (including the other Nvidia bug mentioned in the OP).

Thanks in advance for your help.

P.S.: This is what my Speaker Setup looks like. I tried checking the box for "Top front left/right" (to match my 7.1.2 Atmos setup), but that didn't seem to make a difference. In fact, in the two instances that Dolby Atmos for Home Theater did show up and work, I had that box unchecked.