** Changed in: linux (Ubuntu Cosmic)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1814308
Title:
amdgpu with mst WARNING on blanking
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Xenial:
Invalid
Status in linux source package in Bionic:
In Progress
Status in linux source package in Cosmic:
Fix Committed
Status in linux source package in Disco:
Fix Released
Bug description:
[impact]
The amdgpu driver, when configured with MST monitors (i.e. displayport
"daisy-chaining"), encounters a WARNING when blanking - such as when
the display(s) are put to sleep after idle timeout.
[test case]
on a system with a amd gpu using the amdgpu driver, that is capable
and configured for displayport mst (with multiple dp daisy chained
monitors), blank the screen and then wake up the screen. This will be
logged:
[drm:generic_reg_wait [amdgpu]] *ERROR* REG_WAIT timeout 10us * 3000
tries - dce110_stream_encoder_dp_blank line:944
------------[ cut here ]------------
WARNING: CPU: 0 PID: 2201 at
/var/lib/dkms/amdgpu/18.50-690240/build/amd/amdgpu/../display/dc/dc_helper.c:249
generic_reg_wait+0xe7/0x160 [amdgpu]
Call Trace:
dce110_stream_encoder_dp_blank+0x11c/0x180 [amdgpu]
core_link_disable_stream+0x40/0x230 [amdgpu]
? generic_reg_update_ex+0xdb/0x130 [amdgpu]
dce110_reset_hw_ctx_wrap+0xb7/0x1f0 [amdgpu]
dce110_apply_ctx_to_hw+0x30/0x430 [amdgpu]
? dce110_apply_ctx_for_surface+0x206/0x260 [amdgpu]
dc_commit_state+0x2ba/0x4d0 [amdgpu]
amdgpu_dm_atomic_commit_tail+0x297/0xd70 [amdgpu]
? amdgpu_bo_pin_restricted+0x58/0x260 [amdgpu]
? wait_for_completion_timeout+0x1f/0x120
? wait_for_completion_interruptible+0x1c/0x160
commit_tail+0x3d/0x60 [drm_kms_helper]
drm_atomic_helper_commit+0xf6/0x100 [drm_kms_helper]
drm_atomic_connector_commit_dpms+0xe5/0xf0 [drm]
drm_mode_obj_set_property_ioctl+0x14f/0x250 [drm]
drm_mode_connector_property_set_ioctl+0x2e/0x40 [drm]
drm_ioctl+0x1e0/0x430 [drm]
? drm_mode_connector_set_obj_prop+0x70/0x70 [drm]
? ep_read_events_proc+0xb0/0xb0
? ep_scan_ready_list.constprop.18+0x1e6/0x1f0
? timerqueue_add+0x52/0x80
amdgpu_drm_ioctl+0x49/0x80 [amdgpu]
do_vfs_ioctl+0x90/0x5f0
SyS_ioctl+0x74/0x80
do_syscall_64+0x74/0x140
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
---[ end trace 3ed7b77a97d60f72 ]---
[regression potential]
this modifies the sequence of actions during link disabling, so any
regressions would appear at that time.
[other info]
this is from upstream 8c9d90eebd23b6d40ddf4ce5df5ca2b932336a06
this is included in disco from bug 1812427
this is needed in bionic and cosmic
the xenial kernel does not (reliably) support dp mst, so this is not
needed there
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