Hi
There's a bug with monitor hotplug starting with the kernel 5.7.
I have Radeon RX 570. If I boot the system with the monitor unplugged and
then plug the monitor via DVI, the kernel 5.6 and below will properly
initialized graphics; the kernels 5.7+ will not initialize it - and the
monitor reports no signal.
I bisected the issue and it is caused by the patch
4fdda2e66de0b7d37aa27af3c1bbe25ecb2d5408 ("drm/amdgpu/runpm: enable runpm
on baco capable VI+ asics")
When I remove the code that sets adev->runpm on the kernel 5.12, monitor
hotplug works correctly.
Mikulas
Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 2 --
1 file changed, 2 deletions(-)
Index: linux-5.12/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
===================================================================
--- linux-5.12.orig/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c 2021-04-26 14:50:53.000000000 +0200
+++ linux-5.12/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c 2021-05-03 16:19:54.000000000 +0200
@@ -183,8 +183,6 @@ int amdgpu_driver_load_kms(struct amdgpu
adev->runpm = true;
break;
default:
- /* enable runpm on CI+ */
- adev->runpm = true;
break;
}
if (adev->runpm)
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