On 2020-06-10 13:48, n952162 wrote:
On 2020-06-09 23:53, n952162 wrote:
I posted about this problem perhaps a year ago - when running with
AMDGPU, my system won't turn off, I have to hold the power button down
for a long time, forcing it down.
At that time, various people commented. but AMDGPU didn't work at all
for me in the end, didn't talk to my HDMI display.
I gave up on it.
Thanks to all the great help here, I finally got my system properly
updated and AMDGPU working, and it finally talks to my HDMI display.
But, it still doesn't shut down.
Is it a bug? Is my system still not right? Is there something I have
to do yet?
The following assignment is on the linux line when booting in grub:
amdgpu.dc=1
When I make that 0, the system shuts down properly when the power button
is pressed.
When it's 1, the system hangs after blank screen when that button is
pressed.
I found this in the AMDGPU webpage:
/AMDGPU with Display Core was first implemented for VEGA10 (GCN5.0)
and RAVEN (with DCN 1.0) GPUs/APUs. Kernels before version 4.17 have
(experimental) DC support for older cards (GCN1.1 and newer) via
command line option /amdgpu.dc=1/, which may work better than the
older radeon kernel module. Likewise, if DC needs to be disabled for
any particular reason, option /amdgpu.dc=0/can be used on the kernel
command line.
/
It's not clear to me if DC serves a function in kernels >= 4.17 or why
it's installed as default by grub ...
I don't see anything similar in the new kernel parameters I posted to
this topic, but I do find this in my .config file:
#
# Display Engine Configuration
#
CONFIG_DRM_AMD_DC=y
CONFIG_DRM_AMD_DC_DCN1_0=y
# CONFIG_DEBUG_KERNEL_DC is not set
Was this left over from an earlier configuration and not properly
cleaned out, or is it necessary, for some reason?
Can someone explain how the amdgpu.dc=1 parameter gets passed to grub?
Thanks in advance.
//
