OSD: Fedora release 9 (Sulphur)
In both UXA and EXA mode, it will have a disordered output when rotate the screen using 'xrandr --output LVDS --rotate left'. (See the picture in attachment)
2. xrandr --output LVDS --rotate left (right or inverted)
Created attachment 23202 [details]
Created attachment 23203 [details]
Created attachment 23204 [details]
I think it was caused by tiling. If I add an option Tiling false disabling it, then it works well.
It also existed on G33 and 915gm with tiling on.
I think the fence register setup for tiling at execbuf time is interfering with rendering due to there being two fence registers set up for the front buffer: one by the UMS 2D driver, and another by the kernel when we execute the Render operation to draw the rotated buffer. If we set the tiling bits in i915_render.c instead of relying on the fences, then the problem goes away.
*** Bug 20434 has been marked as a duplicate of this bug. ***
I find it was caused by the commit 0f973f27888e4664b253ab2cf69c67c2eb80ab1b in
the for-airlied branch. The commit's detail is as following:
Author: Jesse Barnes <email@example.com>
Date: Mon Jan 26 17:10:45 2009 -0800
drm/i915: add fence register management to execbuf
Adds code to set up fence registers at execbuf time on pre-965 chips as
necessary. Also fixes up a few bugs in the pre-965 tile register support
(get_order != ffs). The number of fences available to the kernel defaults
to the hw limit minus 3 (for legacy X front/back/depth), but a new
parameter allows userspace to override that as needed.
Ok so the duplicate fence setup should be coming from:
- 2D driver sets up a fence reg at allocation time
- pin ioctl sets up another fence at pin time
the second one will set the fence register number etc in the bo so subsequent execbufs shouldn't allocate one; Eric how did you remove the duplicate setup?
If I'm correct then the attached patch should work, can you give it a try?
Created attachment 23815 [details] [review]
don't set up fence registers if the kernel can do it
This patch avoids setting up fence registers at allocation time if execbuf fencing is active, since the pin ioctl should take care of that for us.
Jian, can you give the patch a try?
jbarnes, how does this ensure that the fence stays permanently on the scanned out buffer? it'll just get stolen by other clients execing, right?
It shouldn't, since the scanout buffer is pinned. The fence stealing code shouldn't try to steal those regs & reuse them in that case, but maybe I need to look at the code again.
(In reply to comment #11)
> Jian, can you give the patch a try?
Hi, Jesse. I tried with your patch and it worked well now, it will display normally when rotate both with UXA and EXA. But I have to mention that after rotate then log into the gnome, it will have a blurred desktop. As #20287.
Fix pushed. Still trying to reproduce #20287.
Author: Jesse Barnes <firstname.lastname@example.org>
Date: Thu Mar 19 13:25:29 2009 -0700
Don't install fences if the kernel is managing them
It is OK now.