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