https://bugzilla.kernel.org/show_bug.cgi?id=199797
Bug ID: 199797
Summary: Low resolution on monitor reconnect with amdgpu and
Dell P2715Q
Product: Drivers
Version: 2.5
Kernel Version: 4.16.10
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - non Intel)
Assignee: drivers_video-...@kernel-bugs.osdl.org
Reporter: j...@pseudoberries.com
Regression: No
Created attachment 276131
--> https://bugzilla.kernel.org/attachment.cgi?id=276131&action=edit
Verbose drm log (echo 0xff > /sys/module/drm/parameters/debug)
When I unplug and plug in my Dell P2715Q monitor, the resolution is wrong. I
get 800x600@75Hz instead of the native resolution (3840x2160@60Hz). Sometimes
I'm able to switch to the native resolution with xrandr, other times xrandr
reports that it cannot find the mode. In that case it helps to turn the monitor
off and on, after which the mode is available to xrandr (EDID issue?).
dmesg reports the following error:
[drm:dm_restore_drm_connector_state [amdgpu]] *ERROR* Restoring old state
failed with -22
I use a kvm switch with the monitor, so the monitor is reconnected quite often.
I've eliminated the kvm switch as the source of the problem by plugging the
monitor directly into the GPU (an AMD RX560), and replugging the displayport
cable.
I've tried dumping the EDID to /lib/firmware and booting with
drm.edid_firmware=edid/DELL-P2715Q.bin, but this doesn't seem to help.
Verbose drm log attached.
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