[Bug 28383] New: Cloned screens with different res/refresh cause problems with mesa demos since new dri2 vsync.

[Mario Kleiner]

On Jun 4, 2010, at 4:02 PM, dri-devel-request at lists.freedesktop.org  
wrote:
> Message: 2
> Date: Fri,  4 Jun 2010 04:28:02 -0700 (PDT)
> From: bugzilla-daemon at freedesktop.org
> Subject: [Bug 28383] New: Cloned screens with different res/refresh
> 	cause	problems with mesa demos since new dri2 vsync.
> To: dri-devel at lists.freedesktop.org
> Message-ID: <bug-28383-502 at http.bugs.freedesktop.org/>
> Content-Type: text/plain; charset="UTF-8"
>
> https://bugs.freedesktop.org/show_bug.cgi?id=28383
>
>            Summary: Cloned screens with different res/refresh cause
>                     problems with mesa demos since new dri2 vsync.
>            Product: Mesa
>            Version: git
>           Platform: x86 (IA32)
>         OS/Version: Linux (All)
>             Status: NEW
>           Severity: normal
>           Priority: medium
>          Component: Drivers/DRI/R600
>         AssignedTo: dri-devel at lists.freedesktop.org
>         ReportedBy: lists at andyfurniss.entadsl.com
>
>
> I think this is linked to the new dri2 vsync but mat be wrong...
>
> rv670 mesa git, ddx git xorg git (2 weeks ago) drt kernels.
>
> Not just latest drt and unrelated to tiling patches.
>
> I am starting with a TV connected @ 1024x768 + vga monitor @  
> 1920x1080 so the
> top left section of the monitor screen gets tv(50Hz) vsync -  
> monitor is 60Hz.
>
> If I start a mesa demo and it starts in the TV area it will sync to  
> 50HZ if I
> move it outside the top left area it will sync to 60Hz.
>
> The problem is if I then move it back to the TV area it will stop  
> rendering and
> become unresponsive. I can <ctrl><c> it but the window will remain.  
> If I the
> move the window around enough I can get xserver to segfault.
>
> This doesn't happen with UMS or a drt from 29th April (uses old  
> vsync).
> It doesn't happen if I disable TV with xrandr.

Diagnosis by treatment: Can you try if the attached patch fixes the  
problem for you?

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best,
-mario

>
> [   489.682] 0: /home/andy/Src/Xorg-git/modular/bin/Xorg  
> (xorg_backtrace+0x3b)
> [0x80da21b]
> [   489.682] 1: /home/andy/Src/Xorg-git/modular/bin/Xorg (0x8048000 
> +0x59ca5)
> [0x80a1ca5]
> [   489.682] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xffffe40c]
> [   489.682] 3: /home/andy/Src/Xorg-git/modular/bin/Xorg  
> (LocalClient+0x41)
> [0x809d8d1]
> [   489.682] 4:
> /home/andy/Src/Xorg-git/modular/lib/xorg/modules/extensions/libdri2.so
> (0xb73ce000+0x309b) [0xb73d109b]
> [   489.682] 5: /home/andy/Src/Xorg-git/modular/bin/Xorg (0x8048000 
> +0x25198)
> [0x806d198]
> [   489.682] 6: /home/andy/Src/Xorg-git/modular/bin/Xorg (0x8048000 
> +0x1a86a)
> [0x806286a]
> [   489.682] 7: /lib/libc.so.6 (__libc_start_main+0xd0) [0xb7495380]
> [   489.682] 8: /home/andy/Src/Xorg-git/modular/bin/Xorg (0x8048000 
> +0x1a481)
> [0x8062481]
> [   489.682] Segmentation fault at address 0x18
>
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