https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209821

--- Comment #23 from Kalten <kal...@gmx.at> ---
Greetings!

I do have the halting-problem.

Hardware 1:
* ASUS P8Z68-V PRO   (not a PRO/GEN3)
* AMIBIOS 080010 ALASKA Ver.36.03
* CPU: Intel(R) Core(TM) i5-2400 CPU @ 3.10GHz (3110.22-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0x206a7  Family=0x6  Model=0x2a  Stepping=7
 
Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
 
Features2=0x1fbae3ff<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX>
  AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
  AMD Features2=0x1<LAHF>
  XSAVE Features=0x1<XSAVEOPT>
  VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID
  TSC: P-state invariant, performance statistics
* Onboard Graphics (I assume intel i915)
* tested with and without: nVidia GeForce GTX 770 in PCIe

Hardware 2:
* ASUS P8H67-M Rev.3.0
* SMBIOS v.2.6 Ver.39.01
* CPU: an i5 as well

I was not successful, but you might want to know what I have tried.

To sum it up: Booting successfully on another PC in UEFI mode I have
arrived at the speculation that it might be that it has nothing to do
with a problem related to the graphic chips etc—although switching to
VT(efifb) or similar might be the problem.

Obviously we are stuck at what ever comes after reporting the EFI
framebuffer information including the masks AND clearing the screen
followed by the to be reported lines:
...8<---
GDB: no debug ports present
KDB: debugger backends: ddb
KDB: current backend: ddb
---<<BOOT>>---
--->8...


Using USB-Stick with following images:
http://ftp.freebsd.org/pub/FreeBSD/releases/ISO-IMAGES/12.1/FreeBSD-12.1-RELEASE-amd64-memstick.img
http://ftp.freebsd.org/pub/FreeBSD/snapshots/ISO-IMAGES/13.0/FreeBSD-13.0-CURRENT-amd64-20200409-r359731-memstick.img

One test was as follows: I did install—booting in UEFI mode—a
12.1-RELEASE onto an empty GPT disk in another PC.
That disk I did attach to my two problematic PCs and booted.
Strangely both do not think the hard disk to be bootable.


In the 12.1-RELEASE version I have tried several modifications:

* ...8<--- /boot/loader.conf on the USB-Stick
  hint.apic.0.disabled="1"
  --->8...
  Did not change the problem :-(

* ...8<--- /boot/loader.conf on the USB-Stick
  kern.vty="sc"
  # as well as    kern.vty=sc
  --->8...
  Did not change the problem :-(

* ...8<--- /boot/loader.conf on the USB-Stick
  exec="set mode 0"
  # as well as 3, 12, ...
  # I could see the effect
  --->8...
  Did not change the problem :-(

* ...8<--- /boot/loader.conf on the USB-Stick
  exec="gop set 0"
  # as well as 3, 12, ...
  # I could see the effect
  --->8...
  Did not change the problem :-(

* ...8<--- /boot/loader.conf on the USB-Stick
  efi_max_resolution="480p"
  # as well as "720p", "1080p", "800x600" 
  # I could see the effect
  --->8...
  Did not change the problem :-(

* loading graphics/drm-kmod for the i915 (5th generation as CPU i5-*)
 
https://forums.freebsd.org/threads/how-to-use-the-old-or-the-new-i915kms-driver-for-intel-integrated-graphics-with-xorg.66732/
  mentions something about that topic (using port from 5th generation
  onward instead of /boot/kernel/i915kms.ko)
  I did install using BIOS boot. In that system I did build and install
  the mentioned port, than mounted the USB stick and copied
  /boot/modules/ to it. I did add a couple of lines on the USB stick:
  ...8<--- /boot/loader.conf on the USB-Stick
  verbose_loading="YES"
  newintelgraka_name="/boot/modules/i915kms.ko"
  newintelgraka_load="YES"
  --->8...
  I could observe that it did load the correct kernel module including
  the correct dependencies out of /boot/modules/.
  It did not help (I did this with my nVidia GeForce GTX 770 installed)
  Did not change the problem :-(

I too am at a loss.

Regards,
 Kalten

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