[Help] Screen Issues Dell Inspiron 7548 HD5500 4K

[RehabMan]

No luck doing this, the same thing happens, I get “garbled screen” with valid id

You never provided PR files for this scenario.

 

[Dell]

You never provided PR files for this scenario.

Here are the debug files. I had to make a script so the gen_debug tool would run automatically at start because I cannot see anything with the gray screen (on which if I press keys from the keyboard it does like shown in the video of post #1).

 

[RehabMan]

Here are the debug files. I had to make a script so the gen_debug tool would run automatically at start because I cannot see anything with the gray screen (on which if I press keys from the keyboard it does like shown in the video of post #1).

Perhaps you need to set DVMT-prealloc larger (128mb), and then patch the framebuffer to match.

 

[Dell]

Perhaps you need to set DVMT-prealloc larger (128mb), and then patch the framebuffer to match.

You mean changing the BIOS or changing the config.plist?

 

[RehabMan]

You mean changing the BIOS or changing the config.plist?

It will involve both.
If your BIOS has no option for DVMT-prealloc, you'll need to use setup_var or setup_var2 from the special/grub UEFI shell.
And then you'll need to patch the framebuffer memory amounts to match (using WhateverGreen based patches, via config.plist/Devices/Properties).

 

[Dell]

It will involve both.
If your BIOS has no option for DVMT-prealloc, you'll need to use setup_var or setup_var2 from the special/grub UEFI shell.
And then you'll need to patch the framebuffer memory amounts to match (using WhateverGreen based patches, via config.plist/Devices/Properties).

If this screen appears when booting after changing the Framebuffer values to match 128MB, it means that I have a 64MB DMVT-prealloc?
(Because it’s says available 67104768 bytes)


Edit:
I don’t know how to check correctly my DVMT-prealloc, checked on windows and Linux and both says 128MB, but I read that they are not reliable information.

 

[RehabMan]

If this screen appears when booting after changing the Framebuffer values to match 128MB, it means that I have a 64MB DMVT-prealloc?
(Because it’s says available 67104768 bytes)
View attachment 360839

It would appear so.

Edit:
I don’t know how to check correctly my DVMT-prealloc, checked on windows and Linux and both says 128MB, but I read that they are not reliable information.

That Windows stat has nothing to do with DVMT-prealloc.

 

[Dell]

It will involve both.
If your BIOS has no option for DVMT-prealloc, you'll need to use setup_var or setup_var2 from the special/grub UEFI shell.
And then you'll need to patch the framebuffer memory amounts to match (using WhateverGreen based patches, via config.plist/Devices/Properties).

There is another option to try before hacking the BIOS?
I mean, at least the DVMT is 64MB, unless the 4K display needs more tan that. Maybe I can do something else to try to fix this.
Thank you for your time @RehabMan

 

[RehabMan]

There is another option to try before hacking the BIOS?
I mean, at least the DVMT is 64MB, unless the 4K display needs more tan that. Maybe I can do something else to try to fix this.
Thank you for your time @RehabMan

The 4k display may need more than 64mb. Hence the suggestion.

 

[Dell]

Perhaps you need to set DVMT-prealloc larger (128mb), and then patch the framebuffer to match.

I don’t seem able to change it. I extracted this from bios asi per guide:


And then change it here:


But if I enter again to the grub menu to check if it’s changed this appears:



The BIOS is playing me.