[solved] Upgrade screen to FHD results to garbled screen

[gelomon]

After upgrading my unit's screen to FHD(Samsung LTN156HL-02) booting up my hack shows garbled screen and to use it properly needs to enable legacy boot. Is there any other way around aside from enabling legacy boot? My boot becomes very slow. It seems like legacy boot for me takes 10-15 seconds to finish POST then loads clover. Any help will be greatly appreciated

PS: Samsung IPS screen was awesome! Nice viewing angles and more quality display for my hack.

 

[RehabMan]

After upgrading my unit's screen to FHD(Samsung LTN156HL-02) booting up my hack shows garbled screen and to use it properly needs to enable legacy boot. Is there any other way around aside from enabling legacy boot? My boot becomes very slow. It seems like legacy boot for me takes 10-15 seconds to finish POST then loads clover. Any help will be greatly appreciated

PS: Samsung IPS screen was awesome! Nice viewing angles and more quality display for my hack.

No "Problem Reporting" files attached.
Read FAQ, "Problem Reporting" again. Carefully. Attach all requested files/output.
https://www.tonymacx86.com/threads/faq-read-first-laptop-frequent-questions.164990/
Use the tool mentioned in the FAQ, that way it is less likely you'll omit something.

 

[gelomon]

I have found a workaround but it annoying. After booting my hack with garbled screen on my new FHD screen, to fix it without enabling Legacy Support is to close the laptop lid and reopen it(sleeping the laptop).

Hi @RehabMan , please see below for my reporting files. Hope you can help me my config.plist on attached files does not contain my SMBIOS(I deleted it for privacy)

 

[RehabMan]

I have found a workaround but it annoying. After booting my hack with garbled screen on my new FHD screen, to fix it without enabling Legacy Support is to close the laptop lid and reopen it(sleeping the laptop).

Hi @RehabMan , please see below for my reporting files. Hope you can help me my config.plist on attached files does not contain my SMBIOS(I deleted it for privacy)

Enable CSM/legacy boot in BIOS.

 

[gelomon]

Enable CSM/legacy boot in BIOS.

That is what I have done, It fixed the issue but adds 5-10 seconds boot on POST is there no other way?
Here is what it looks like on boot with legacy support disabled:

Thank you

-John

 

[RehabMan]

That is what I have done, It fixed the issue but adds 5-10 seconds boot on POST is there no other way?

You could experiment with different values for config.plist/GUI/ScreenResolution.
Or you could determine what IGPU registers are different in the CSM vs. not CSM scenario, then write some ACPI code to correct it.

 

[gelomon]

Or you could determine what IGPU registers are different in the CSM vs. not CSM scenario, then write some ACPI code to correct it.

Correct me if I'm wrong. I need to check my DSDT extracted via patchmatic after booting with CSM and not CSM scenario? is that right? or I need to check registers on other place?

 

[RehabMan]

Correct me if I'm wrong. I need to check my DSDT extracted via patchmatic after booting with CSM and not CSM scenario? is that right? or I need to check registers on other place?

IGPU registers would require that you write custom ACPI code to dump them (using ACPIDebug).
You will need to have a hardware programming background, ability to read the IGPU data sheet, and knowledge of ACPI.

 

[gelomon]

IGPU registers would require that you write custom ACPI code to dump them (using ACPIDebug).
You will need to have a hardware programming background, ability to read the IGPU data sheet, and knowledge of ACPI.

That would be a working progress for me and maybe a long journey. Clover GUI Resolution helps but the resolution working is only 1280x1024, it looks very awful but it does the job. any thoughts where can i see resolutions that I can use? I have tried all the resolutions given by clover configurator(1280x1024 - 1920x1080) and put it in config using plist editor but no other resolution work. Thank you in advance, I also have an idea, can EDID affect this also? if its a possible solution maybe I can patch it? hmmm

 

[RehabMan]

Clover GUI Resolution helps but the resolution working is only 1280x1024, it looks very awful but it does the job.

As expected. You could create a theme that is stretched appropriately such that the graphics would display with correct aspect ratio.

any thoughts where can i see resolutions that I can use? I have tried all the resolutions given by clover configurator(1280x1024 - 1920x1080) and put it in config using plist editor but no other resolution work.

It is limited by the resolutions your BIOS (VESA) provides.
The mismatch is quite typical.

Thank you in advance, I also have an idea, can EDID affect this also?

Not likely EDID related.