Custom Resolution Utility (CRU)

[Seneral]

(02-13-2020 10:00 PM)ToastyX Wrote:  

(02-12-2020 03:37 PM)Seneral Wrote:  Hello,
I need help getting a cheap 2k LCD screen of 1440x2560 portrait mode to work. It only has one mode it works at, and CRU seems to identify it correctly. But Windows and my AMD drivers won't recognize it correctly, after some fiddling around they finally acknowledge it as a 1440x2560 display but the timing seems to be off (atleast the timing in the radeon software settings differ greatly from the one CRU reads). I verified on a linux machine which does perfectly recognize the LCD that the timing CRU reads is indeed correct.
Now it sometimes just stays black although it is adressed as a 1440x2560 display and LCD led is green indicating no error, sometimes it does actually show a solid image with visual glitches (image persisting until I change a setting or reconnect). Just now I also had a case for the first time where the image with the glitches shows, but flashes at varying frequencies (frequency changes at irregular rates, but image generally shows longer than the black screen does, usually for at east 200-500ms, but as low as 5-10ms). And another new visual glitch, the stripes as usual and rare flickering of the upper half of the display in correct orientation (so upper half was displayed on lower half and vice versa). All in all seems to be the timing.

Here are some images: https://imgur.com/a/ywDMWC1
1. CRU with the correct timing
2. Linux with working LCD showing same timing
3. What radeon software automatically detects
4. Trying to enter CRUs timing information, won't let me accept it, says display doesn't support it. Did I do something wrong / interpret values wrong?
5. The visual glitches I'm talking about (except for the flashes, but when it flashes these visual glitches are also there)

Can anyone help me? Why can't I set the correct timing values in radeon software? I did ask over at the AMD forums before in case you're wondering. Thank you very much!

I don't see why AMD's driver wouldn't use the timing parameters provided by the EDID. The only problem I see is when you entered the custom resolution, the "G.Refresh Rate" is set to 59.939 Hz instead of 50 Hz.

Not sure either, but it definitely does read something wrong. Double checked after reinstallation with factory reset of the radeon software. https://imgur.com/COkKdIT

Yeah not sure why that was not 50.000 there, that screen was from when the drivers didn't even acknowledged the display as 1440x2560 at all (luckily that is fixed now). Pretty sure it was automatically changed. Unfortunately it does not make a difference, radeon software still insists the LCD is incompatible with these settings, which is plain wrong. My other machine managed to drive the LCD just fine with these settings...

Visual glitches still there, btw I can't expain why it works at all (minus gitches, flickering, etc) given that the timings are competely wrong...
At this point it clearly seems like a radeon driver issue, but I can't seem to get help over at the radeon forums. Any tips? Thanks!