| Bug ID | 110780 |
|---|---|
| Summary | RX 580 and 5K displays, bandwidth validation failed with multiple monitors |
| Product | DRI |
| Version | unspecified |
| Hardware | All |
| OS | Linux (All) |
| Status | NEW |
| Severity | major |
| Priority | medium |
| Component | DRM/AMDgpu |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | linuzel@gmail.com |
I have been facing an issue with my 5K display (iiyama ProLite XB2779QQS-S1). 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[3465]: (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. I tried a lot of kernel (includig drm-tip and 5.2-rc1) and they all have the same issue. My custom kernel with no validation is based on Ubuntu's 5.0.0-15-generic. If I can help by providing more logs or test something ask and I will do my best.
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