Bug#931430: Update (X Server in PowerPC Debian SID Xorg is Unusably Slow on Wallstreet)
On Thu, 11 Jul 2019, userm57@yahoo.com wrote:
> On 7/11/19 8:15 PM, Finn Thain wrote:
> > On Thu, 11 Jul 2019, userm57@yahoo.com wrote:
> > ...
> >>
> >> Shadowfb has no effect for mach64.
> >
> > I haven't seen any results that confirm this. Your results seem to
> > show that the xorg.conf change was bogus.
> >
> > Moreover, the X server logs show that the shadow framebuffer was never
> > actually enabled for any mach64 test.
> >
> > So it's an open question.
> > ...
>
> Please see Xorg_sid_mach64.log.
>
> That file has this line:
>
> [ 16529.773] (WW) MACH64(0): Cannot shadow an accelerated frame buffer.
>
> I take that to mean that shadowing can not work for mach64, so it is
> explicitly disabled regardless of whether it is specified in an
> xorg.conf file (and it must be specified somewhere by default for
> mach64, since I didn't use any custom xorg.conf files).
Alternatively, "cannot shadow an accelerated frame buffer" could imply
that we need to disable acceleration for mach64.
> That same message, and no other message related to shadowing, appears in
> the Xorg log regardless of whether shadowfb (or shadow_fb) is set to
> "true" or "false" in a custom /etc/X11/xorg.conf file:
>
But why would the above warning message show up if shadowfb were in fact
disabled by xorg.conf? I take the warning to mean that the xorg.conf I
provided is bogus.
Anyway, I can't offer a config that would enable/disable acceleration or
enable/disable shadowed framebuffer, so I'll leave it with Michel to
pursue that workaround if he wishes to.
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