| Summary: | Screen tears on xrandr orientation inverted | ||||||||||||
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| Product: | xorg | Reporter: | Jeff Cook <jeff> | ||||||||||
| Component: | Driver/intel | Assignee: | Chris Wilson <chris> | ||||||||||
| Status: | RESOLVED FIXED | QA Contact: | Intel GFX Bugs mailing list <intel-gfx-bugs> | ||||||||||
| Severity: | normal | ||||||||||||
| Priority: | medium | CC: | intel-gfx-bugs, jeff.zheng, li.l.xu, matthew.d.roper | ||||||||||
| Version: | unspecified | ||||||||||||
| Hardware: | x86-64 (AMD64) | ||||||||||||
| OS: | Linux (All) | ||||||||||||
| Whiteboard: | |||||||||||||
| i915 platform: | i915 features: | ||||||||||||
| Attachments: |
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Description
Jeff Cook
2014-11-22 00:06:11 UTC
Woops, looks like that screenshot went up with the wrong mimetype. Can someone correct that? Created attachment 109828 [details]
screenshot of tearing effect
screenshot of tearing effect (correct mimetype)
Thanks for that Chris. Is there a recent patch I can try that is perhaps less "sketchy and completely broken"? Hmm, the other question here is whether fbc is enabled? "FBC can show stale data when using 180 degree hardware rotation of the primary display plane. WA: Do not enable FBC when using hardware 180 degree rotation on the primary display plane." I believe FBC is disabled. Here's what I found in /sys: jeff@jeff-yoga:~$ sudo cat /sys/kernel/debug/dri/0/i915_fbc_status FBC disabled: disabled per chip default jeff@jeff-yoga:~$ sudo cat /sys/kernel/debug/dri/64/i915_fbc_status FBC disabled: disabled per chip default *** Bug 87662 has been marked as a duplicate of this bug. *** Yikes, this regression made it into a stable release. (In reply to Chris Wilson from comment #8) > Yikes, this regression made it into a stable release. I was actually able to reproduce this with 3.14. I tried to reproduce this before with drm-intel-nightly on SNB, IVB and HSW, but failed. Turns out I needed a more recent xorg intel driver to uncover the bug. I bisected the first appearance of the bug to commit 975b9798be77b30cbed485583d0ccb48318708f7 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Wed May 21 08:58:24 2014 +0100 sna: Add support for Present The problem goes away after commit commit 105d478cdd70ac3b38be51c9014b22b7233c241e Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Wed Aug 6 09:10:30 2014 +0100 sna: Enable kernel rotation support by default but oddly, after commit b6eeb7a1f7efa591504070b606be655e27e6e9c2 Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Wed Nov 5 13:03:41 2014 +0000 Disable DRI3 by default turning the rotation on with xrandr causes a black screen that can be fixed by vt switching away and back to X. Anyway, I haven't looked yet into why the support for the Present extension uncovers the bug, but it seems this bug has been in the kernel for a while. (In reply to Ander Conselvan de Oliveira from comment #9) > (In reply to Chris Wilson from comment #8) > > Yikes, this regression made it into a stable release. > > I was actually able to reproduce this with 3.14. I tried to reproduce this > before with drm-intel-nightly on SNB, IVB and HSW, but failed. Turns out I > needed a more recent xorg intel driver to uncover the bug. I bisected the > first appearance of the bug to > > commit 975b9798be77b30cbed485583d0ccb48318708f7 > Author: Chris Wilson <chris@chris-wilson.co.uk> > Date: Wed May 21 08:58:24 2014 +0100 > > sna: Add support for Present I think that is a seperate bug, please could you file a new report with a full description of the behavior you see and a full debug log. (There is certainly a kernel regression due to planes) (In reply to Chris Wilson from comment #10) > (There is certainly a kernel regression due to planes) Even so, the original report makes no mention of using nightly or a very recent kernel. Also, the link to github implies the problem started to happen after an upgrade from Ubuntu 14.04 to 14.10. The latter uses kernel 3.16 and xf86-video-intel version 2.99.914. I am able to reproduce the bug with that config, getting the screen divided horizontally like in the attached screenshot. Adding Option "Present" "false" to the device section of xorg.conf works around the problem. Created attachment 111519 [details]
screenshot of the problem with kernel 3.16
Created attachment 111520 [details]
Xorg.log with --enable-debug=full
I tried to reproduce the problem with the driver compiled with --enable-debug=full. However, the session strangely dies after setting the rotation. There is no error reported in the log after setting rotation to inverted.
The log seems to indicate that a shadow buffer is being used since the rotation is not supported by the kernel.
(In reply to Ander Conselvan de Oliveira from comment #11) > (In reply to Chris Wilson from comment #10) > > (There is certainly a kernel regression due to planes) > > Even so, the original report makes no mention of using nightly or a very > recent kernel. Duped the wrong bug. But since I was using this to track the kernel regression, hence the P1 blocker status, it would have been better to create a new bug. Then update the ddx... |
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