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UHD panel upgrade T14/T15 gen 2: odd behaviour

2020 New name Series after T430-T490 / T530-T590
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iamdmc
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UHD panel upgrade T14/T15 gen 2: odd behaviour

#1 Post by iamdmc » Mon Dec 06, 2021 1:32 pm

Hi all. I'm trying to do some problem solving... I bought my father a 15.6" UHD panel upgrade (AUO B156ZAN04.1) to replace the original FHD panel in his T15 gen 2. I bought a compatible 40-pin eDP UHD cable (narrow 0.4mm pitch) and connected the panel and board

photos: https://imgur.com/a/Ln1YZGY

On boot, the Lenovo logo displays correctly, and BIOS also displays correctly. When booting into ubuntu, the picture displays correctly at 3840x2160

However... in Windows 10, there are vertical stripes across the whole screen and it appears black and white. It seems almost as if the RGB channels are out of horizontal synch, as they seem offset from each other. It seems like an hsynch issue - which I've never come across on a digital video signal, but was not uncommon with analog VGA

Laptop is on the Newest Windows 10 update, newest BIOS, newest Intel graphics driver, newest ThinkPad Monitor file, and newest NVidia T500 graphics driver...

I've tried disabling the Xe graphics driver - without change. Same with disabling the NVidia driver.

any ideas? It seems almost certain to be a driver issue... I just can't figure out which one

I've also tried a 40 pin eDP 0.5mm pitch cable with a QHD 2560x1440 panel, and UHD 3840x2160 panel and it works perfectly...
ThinkPad P14sgen2 (2021)
i7-1185G7 | 32+8GB RAM | 1TB Samsung 980 Pro (PCIe 3.0 speed) | UHD upgrade | Glass Touchpad | Intel AX210

The X61 is dead... long live the X61

Past IBM ThinkPads: T480s, T450s, X250, X230, X220, X300, T410, X61s, T60p, T41, X31, T23, A21m

iamdmc
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Joined: Fri Sep 21, 2007 11:37 pm
Location: Downtown Toronto, Canada

Re: UHD panel upgrade T14/T15 gen 2: odd behaviour

#2 Post by iamdmc » Tue Dec 07, 2021 10:52 am

Update: after I first tried this on my P14s gen 2 (identical to T14 gen 2) motherboard, I tried it on my T15 gen 2 motherboard. On the T14 gen 2 it always looks like the striped image. It works on the T15 gen 2 motherboard, but if I go on 'standby' then reopen the laptop it again looks like the striped image. Since the P14s, T14, and T15 gen 2 share an identical motherboard - I'm totally puzzled by this

Strangely, if I hibernate or shut down (whether full shut down or Windows 10 modern shut down) the image comes back normal. For now I've disabled standby in every possible way.

So it's definitely a driver issue. And no, resetting the driver with Win+Ctrl+Shift+B does nothing. I've tried several times to uninstall and reinstall the Intel display drivers, but still no change.

I still get an error "2203: system configuration is invalid" every time the system starts up from cold boot, modern shut down, or waking up from hibernation. I have no idea how to fix this...
ThinkPad P14sgen2 (2021)
i7-1185G7 | 32+8GB RAM | 1TB Samsung 980 Pro (PCIe 3.0 speed) | UHD upgrade | Glass Touchpad | Intel AX210

The X61 is dead... long live the X61

Past IBM ThinkPads: T480s, T450s, X250, X230, X220, X300, T410, X61s, T60p, T41, X31, T23, A21m

mikemex
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Location: Coyoacan, Mexico

Re: UHD panel upgrade T14/T15 gen 2: odd behaviour

#3 Post by mikemex » Sat Mar 05, 2022 10:09 am

iamdmc wrote:
Tue Dec 07, 2021 10:52 am
I still get an error "2203: system configuration is invalid" every time the system starts up from cold boot, modern shut down, or waking up from hibernation. I have no idea how to fix this...
Maybe the panel EDID's (or equivalent) is damaged. Or maybe there is a display panel whitelist in the BIOS...

T61: T8300 | 8GB | 400GB S3610 | SXGA
X301: SU9600 | 8GB | 400GB S3610
T420s: 2640m | 16GB | 400GB S3610 | HD+ 4200M
W530: 2740qm | 32GB | 400GB S3610 | FHD K1000M
X1C5: 7600U | 16GB | 512GB XG6 | FHD
P14s G1 AMD: 4750U | 32GB | 1TB PC611 | PG FHD Touch
T14 G2: 1145G7 | 32GB | 256GB PC711 | FHD

iamdmc
Senior Member
Senior Member
Posts: 742
Joined: Fri Sep 21, 2007 11:37 pm
Location: Downtown Toronto, Canada

Re: UHD panel upgrade T14/T15 gen 2: odd behaviour

#4 Post by iamdmc » Sun Mar 06, 2022 4:20 am

mikemex wrote:
Sat Mar 05, 2022 10:09 am
iamdmc wrote:
Tue Dec 07, 2021 10:52 am
I still get an error "2203: system configuration is invalid" every time the system starts up from cold boot, modern shut down, or waking up from hibernation. I have no idea how to fix this...
Maybe the panel EDID's (or equivalent) is damaged. Or maybe there is a display panel whitelist in the BIOS...
I suspect a soft whitelist
ThinkPad P14sgen2 (2021)
i7-1185G7 | 32+8GB RAM | 1TB Samsung 980 Pro (PCIe 3.0 speed) | UHD upgrade | Glass Touchpad | Intel AX210

The X61 is dead... long live the X61

Past IBM ThinkPads: T480s, T450s, X250, X230, X220, X300, T410, X61s, T60p, T41, X31, T23, A21m

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