[Bug 102820] [bisected][DC] commit ebbf7337e2daacacef3e01114e6be68a2a4f11b4 prevents X11 from starting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102820

--- Comment #20 from dwagner <jb5sgc1n.nya at 20mm.eu> ---
(In reply to Harry Wentland from comment #19)
> Created attachment 137476 [details] [review]
> drm/amd/display: Default HDMI6G support to true. Log VBIOS table error.
> 
> Can you see if this helps? Our Windows driver definitely checks the HDMI6G
> flag from VBIOS but it will default to allow 6G on HDMI if the VBIOS check
> fails.
> 
> This patch is porting the same behavior in the hopes that it will help with
> your issue.
I had to change "ctx->logger" into "enc110->base.ctx->logger" to make your
patch
compile (applied on today's head of amd-staging-drm-next).

Yes, that patch changes the behaviour for the better: HDMI 2.0 modes -
especially 4k at 60Hz work fine with this patch applied on my system. Tried
multiple reboots, result was consistent.

> If this patch works a dmesg log with the amdgpu.dc_log=1 option on the
> kernel would help us understand the root cause a bit better.
I did enable amdgpu.dc_log=1 on the kernel command line - but there is no
"Failed to get encoder_cap_info from VBIOS..." message visible in dmesg, which
makes me wonder what makes the new code path differ from the old one.
(Attaching dmesg output below.)

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