Dell Precision M6700 RTX Ampère and Ada Lovelace issues

[SuperMG]

Hello people.

 

I managed to get the RTX 4080 to work on the M6800 eDP UEFI version. No Haswell TDP bugs, displays on eDP and can do 154W max.

 

The same GPU worked on the Clevo P570WM eDP 120Hz 3D laptop (UEFI, 2012, Ivy bridge)

 

However, I tried to use this GPU (with the backlight mod cable) on the Dell Precision M6700 with the eDP 120Hz screen and... It doesn't work.

 

eDP cable is plugged with the backlight mod and the computer doesn't boot, laptop stays on

 

eDP cable is unplugged with the backlight mod cable computer doesn't boot, laptop stays on

 

HDMI is plugged, eDP cable is unplugged with the backlight mod and the computer boots to the bios (external display)

 

The RTX 4080 has eDP on DP_D. The M6700 has eDP set on DP_D. The M6800 also has eDP on DP_D.

 

So what's the difference between the M6700 and M6800? Why it doesn't work?

 

The RTX 3000 from HP works on both laptops. So the maximum I can do for the M6700 is RTX Turing from HP?

 

Any help? 

Edited Wednesday at 10:32 AM by SuperMG

[Annihilator]

different eDP ports? 

[SuperMG]

12 minutes ago, Annihilator said:

different eDP ports? 

No this is wrong.

 

Both are eDP, same connectors.

 

It's eDP on DP_D for both, the same as on the RTX 3000 from HP.

[Annihilator]

trying a bios on the 4080 with less PL maybe? possible the m4700 cant deliver enough power for the whole system?

[SuperMG]

1 hour ago, Annihilator said:

trying a bios on the 4080 with less PL maybe? possible the m4700 cant deliver enough power for the whole system?

No it's not... It doesn't use 100% TDP on the BIOS. This is also wrong. And we're talking about the M6700.

 

Also no other VBIOS are compatible with this GPU.

[Annihilator]

1 hour ago, SuperMG said:

No it's not... It doesn't use 100% TDP on the BIOS. This is also wrong. And we're talking about the M6700.

 

Also no other VBIOS are compatible with this GPU.

 

just know from desktop, when u hit the power button, the whole system has a peak before bios is loaded... think same for laptop?

 

may try with only 1 mem module n disconnect all drives to save some power to test. 

 

 

[SuperMG]

53 minutes ago, Annihilator said:

 

just know from desktop, when u hit the power button, the whole system has a peak before bios is loaded... think same for laptop?

 

may try with only 1 mem module n disconnect all drives to save some power to test. 

 

 

The laptop stays on, no boot, nothing. Before it does some HDD status led blinking and then nothing. So power isn't an issue because the laptop would immediately force shutdown. Memory isn't an issue. Unplugging the CMOS isn't solving the boot issue.

 

The pc boots externally in HDMI out by unplugging the eDP LCD cable, so it's none of these issues...

[JadeRover]

18 hours ago, Annihilator said:

 

just know from desktop, when u hit the power button, the whole system has a peak before bios is loaded... think same for laptop?

 

may try with only 1 mem module n disconnect all drives to save some power to test. 

 

 

 

I don't think this is the case here. The laptop turns on and doesn't post unless a certain configuration is used. The laptop fails to detect/work with the video card and doesn't turn on because of that, this isn't a power related problem, more of a vbios / UEFI / Bios setting that comes into play.

[Annihilator]

3 hours ago, JadeRover said:

 

I don't think this is the case here. The laptop turns on and doesn't post unless a certain configuration is used. The laptop fails to detect/work with the video card and doesn't turn on because of that, this isn't a power related problem, more of a vbios / UEFI / Bios setting that comes into play.

 

think the m4700 has fallback mode like m4800 has, when dedicated graphics dont work, igpu will set automatically to primary. 

[Aaron44126]

iGPU can't be used with eDP displays in this system, only LVDS.

[SuperMG]

14 hours ago, JadeRover said:

 

I don't think this is the case here. The laptop turns on and doesn't post unless a certain configuration is used. The laptop fails to detect/work with the video card and doesn't turn on because of that, this isn't a power related problem, more of a vbios / UEFI / Bios setting that comes into play.

Okay let me try. Everytime I switch the settings, it get resetted maybe because of the CMOS battery, that's why I gave up. Let me switch that.

[JadeRover]

You can replace it for cheap with a regular cr2032 battery and some tape, see here : 

 

 

 

 

 

[SuperMG]

2 hours ago, JadeRover said:

You can replace it for cheap with a regular cr2032 battery and some tape, see here : 

 

 

 

 

 

I already did that, very hard to remove the soldered joints but was able to get a working battery.

[Annihilator]

12 hours ago, Aaron44126 said:

iGPU can't be used with eDP displays in this system, only LVDS.

 

uhhh, so the m6800 is a massive step forward 😄 

[Annihilator]

32 minutes ago, SuperMG said:

I already did that, very hard to remove the soldered joints but was able to get a working battery.

 

or u can order this:

Für Himbeer Pi 5 RTC Batterie kasten Echtzeituhr halter mit Batterie/ohne Batterie Echtzeituhr Batterie modul - AliExpress 502

 

i needed for my old PC, much easier to handle with open, put battery in, n done... when ur system is still plugged in, even no bios data loss. and u need to check the plug size, maybe u need a different model for the m6700

[Aaron44126]

10 minutes ago, Annihilator said:

 

uhhh, so the m6800 is a massive step forward 😄 

 

I was referring to M4700/M6700 here. These systems can only use iGPU with an LVDS panel.

[SuperMG]

29 minutes ago, Aaron44126 said:

 

I was referring to M4700/M6700 here. These systems can only use iGPU with an LVDS panel.

Anything eDP is related to the dGPU unlike the M6800. The M6800 can do iGPU or dGPU in eDP. The M6700 has 40 pins and 4 lines so that's good. Easy 1080p 120Hz and 1440p 120Hz.

 

The M6800 is stuck at 1080p 60Hz.

[SuperMG]

 

Just get a 100% working CMOS battery, set the bios to UEFI and no LEGACY OPROM and there you go. RTX Ada working on eDP 1080p 120Hz. No Optimus, no MUX Switch.

 

If we set to UEFI and LEGACY OPROM enabled, the GPU displays 4-5 blinking on the top left corner of the screen and then... Nothing. No boot, laptop stays on.

 

Now I need to figure out how to disable the LEGACY OPROM. I'll probably disassemble the whole laptop, unplug the eDP LCD and force the boot to HDMI out. Legacy works with HDMI because I tried once and I can disable LEGACY OPROM so I'll obtain the eDP display back.

 

I enabled the legacy oprom to use the shell grub...