https://bugs.freedesktop.org/show_bug.cgi?id=109206

--- Comment #44 from Ondrej Lang <ondrej@lang.sk> ---
Created attachment 144316
  --> https://bugs.freedesktop.org/attachment.cgi?id=144316&action=edit
Kernel log 5.1.3 showing amdgpu drm crash

Experiencing the same problem. On boot with any kernel > 4.20, the graphics is
not initialized, few scrambled lines appear at the bottom of the screen and
then the screen goes blank. The system actually boots as when I entered my
credentials (on the black screen) and did "cat dmesg > dmesg.txt", when I
rebooted with kernel 4.19 the file was there (I have attached it to this
thread). The relevant portion of the dmesg log is:

[    5.133929] [drm] REG_WAIT timeout 1us * 100000 tries -
mpc1_assert_idle_mpcc line:103
[    5.134034] WARNING: CPU: 2 PID: 367 at
drivers/gpu/drm/amd/amdgpu/../display/dc/dc_helper.c:277
generic_reg_wait.cold.0+0x29/0x30 [amdgpu]
...
[    5.134925]  drm_dev_register+0x111/0x150 [drm]
[    5.135335] [drm] Display Core initialized with v3.2.17!
[    5.642999] [drm:hwss_edp_wait_for_hpd_ready [amdgpu]] *ERROR*
hwss_edp_wait_for_hpd_ready: wait timed out!
[    6.142512] [drm:hwss_edp_wait_for_hpd_ready [amdgpu]] *ERROR*
hwss_edp_wait_for_hpd_ready: wait timed out!
[    6.143119] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    6.143121] [drm] Driver supports precise vblank timestamp query.
[    6.158613] [drm] VCN decode and encode initialized successfully(under SPG
Mode).
[    6.161822] [drm] Cannot find any crtc or sizes
[    6.188933] [drm] Initialized amdgpu 3.30.0 20150101 for 0000:04:00.0 on
minor 0

I can also confirm that as a workaround, removing/moving file
/lib/firmware/amdgpu/raven_dmcu.bin and regenerating the initramfs ("mkinitcpio
-p linux" on Arch linux) allows the 5.1.3 kernel to boot normally (I can also
start an X session and everything seems to be fine) and there are no drm errors
in dmesg anymore.

System:
HP ENVY x360 Convertible 15-bq1xx/83C6, BIOS F.20 12/25/2018
Kernel: 5.1.3-arch1-1-ARCH
Grub kernel parameters: amd_iommu=on iommu=pt idle=nomwait

If you need anything else let me know

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