| Summary: | [BDW Regression] VGA output doesn't work with v4.2-rc6 | ||||||||
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| Product: | DRI | Reporter: | Timo Aaltonen <tjaalton> | ||||||
| Component: | DRM/Intel | Assignee: | Ander Conselvan de Oliveira <conselvan2> | ||||||
| Status: | CLOSED FIXED | QA Contact: | Intel GFX Bugs mailing list <intel-gfx-bugs> | ||||||
| Severity: | normal | ||||||||
| Priority: | highest | CC: | gary.c.wang, intel-gfx-bugs, xiong.y.zhang | ||||||
| Version: | XOrg git | ||||||||
| Hardware: | Other | ||||||||
| OS: | All | ||||||||
| Whiteboard: | |||||||||
| i915 platform: | BDW | i915 features: | display/DP MST | ||||||
| Attachments: |
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Marking as highest prio; VGA is pretty basic and this is a regression. Do you happen to have a bisect? clarification, it's external-only mode that's broken, mirrored/extended work I'm told it's broken at least since drm-intel-next-2015-05-22 bisect points to this commit breaking it commit 8504c74c7ae48b4b8ed1f1c0acf67482a7f45c93 Author: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com> Date: Fri May 15 11:51:50 2015 +0300 drm/i915: Preserve ddi_pll_sel when allocating new pipe_config Created attachment 117965 [details] [review] Patch for setting ddi_pll_sel from DP MST encoder config Does the attached patch help? If it doesn't, please provide a dmesg with drm.debug=0x1e. Note that this is not actually VGA but DP MST. The machine in question is a BDW-ULT. Yeah, it's not "native" vga, but some sort of a builtin dongle. Thanks for the patch, I'll get it tested by early next week. Apparently the patch works, thanks. The patch is nightly now: commit 6fa2d197936ba0b8936e813d0adecefac160062b Author: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com> Date: Mon Aug 31 11:23:28 2015 +0300 i915: Set ddi_pll_sel in DP MST path Should we keep this open until it reaches stable? (In reply to Ander Conselvan de Oliveira from comment #8) > Should we keep this open until it reaches stable? Generally, no, but this is now in stable releases, so closing. Thanks for the report. |
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Created attachment 117671 [details] dmesg dump Going from 3.19 to 4.2-rc6 broke VGA output on Dell Latitude E5450. Attached is dmesg with debug=14.