| Bug ID | 110671 |
|---|---|
| Summary | Regression: DP outputs out of sync on dual-DP tiled 5k screen |
| Product | DRI |
| Version | DRI git |
| Hardware | x86-64 (AMD64) |
| OS | Linux (All) |
| Status | NEW |
| Severity | normal |
| Priority | medium |
| Component | DRM/AMDgpu |
| Assignee | dri-devel@lists.freedesktop.org |
| Reporter | bugs@bzatek.net |
With kernel 5.1.1 I get corrupted image on my Dell UP2715K screen (again). The symptomps are similar to the ones in bug 98461 (see also attachment 127570 [details]). In my theory this is caused by the two DisplayPort outputs not being in sync - the screen needs both tiles to be in sync (i.e. scanlines to match) to make a composite final image. The Dell UP2715K monitor has two DP 1.2 inputs, two tiles expecting 2560x2880@60Hz modes (as exposed in EDID/DisplayInfo data). Connected to Radeon Pro WX2100 (Polaris 12). This used to be actually working reliably in kernel 4.20.0, yesterday I fired up kernel 5.1.1 and only got garbage on my screen. Also tested drm-tip kernel that includes drm-next-5.2 branch from the agd5f repo (https://patchwork.freedesktop.org/patch/304430/) - same issue. I haven't got time to bisect the change yet, I was hoping you could point me to a possible commit that broke this. By any chance, do you AMD guys have a 5k tiled screen inhouse for testing?
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