Comment # 20
on bug 102820
from dwagner
(In reply to Harry Wentland from comment #19) > Created attachment 137476 [details] [review] [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@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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