RX 580 and 5K displays, bandwidth validation failed whith multiple monitors
linuzel at gmail.com
Mon May 27 14:58:50 UTC 2019
I have been facing an issue with my 5K display (iiyama ProLite
It works fine as long as it is the only active monitor, as soon as I
activate another monitor the main one (5k) can't display more than 4k.
Debug using "echo 0x4 > /sys/module/drm/parameters/debug" show this :
mai 23 09:01:22 bureau-gael /usr/lib/gdm3/gdm-x-session: (EE)
AMDGPU(0): failed to set mode: Invalid argument
mai 23 09:01:22 bureau-gael kernel: [drm:dce112_validate_bandwidth
[amdgpu]] dce112_validate_bandwidth: Bandwidth validation failed!
I disabled the check by forcing is_display_configuration_supported to
return true in dce_calcs.c and it works fine.
Anything I can do to correct this bandwidth calculation ?
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