[Bug 211033] New: [bisected][regression] amdgpu: *ERROR* Restoring old state failed with -12
bugzilla-daemon at bugzilla.kernel.org
bugzilla-daemon at bugzilla.kernel.org
Mon Jan 4 17:28:59 UTC 2021
https://bugzilla.kernel.org/show_bug.cgi?id=211033
Bug ID: 211033
Summary: [bisected][regression] amdgpu: *ERROR* Restoring old
state failed with -12
Product: Drivers
Version: 2.5
Kernel Version: 5.10.4
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - non Intel)
Assignee: drivers_video-dri at kernel-bugs.osdl.org
Reporter: zaltys at inbox.ru
Regression: No
I have AMD RX560 GPU which is connected to LG 27UD-88 display via ATEN CS782DP
displayPort KVM switch.
I can't reliably switch KVM port to the machine running Kernel 5.10.4 with
previously mentioned GPU. Screen is usually blank and display even goes to
standby after the first try, however sometimes (if I switch KVM ports quickly a
few times) it turns on, but with wrong resolution. dmesg complains with:
[drm:dm_restore_drm_connector_state] *ERROR* Restoring old state failed with
-12
for every failed port switch.
KVM switch is configured to "redetect display" - basically it emulates
replugging when port is switched. I have been using it for 4 years with the
same GPU and it worked correctly until Kernel 5.10.4
I did a bisect, and it showed the first bad commit was:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/drivers/gpu/drm/amd?h=linux-rolling-stable&id=ea64b21c6638d1ac3120fff89eb20c0e525a21d9
Reverting this commit fixed my issue (it works like pre 5.10.4)
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