[Bug 58115] AMD LLANO repeated gpu lockups adn softresets

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58115

--- Comment #7 from Kenney Phillis Jr <kphillisjr at gmail.com> ---
(In reply to comment #6)
> (In reply to comment #6)
> > attempt to enable the all three panels (This should not be allowed to "work"
> > but it passes even though it should fail )
> 
> Why should it fail?
> 
> 

The hardware doesn't support it... Even when I enabled the third display and
used all three at once only two displays had output... In my case the following
configurations are valid:

LVDS + HDMI
LVDS + CRT
CRT + HDMI

However, the following is invalid and leads to corruption bugs and other
issues...
LVDS + HDMI + CRT
> > restart pc
> > attempt to login again ( At this step it should fail)
> 
> That's a login manager / desktop environment issue.
> 
> 

It's not entirely a login manager issue... The radeon hardware itself can only
handle two video output devices at once.

> > Please note that the a6-series chips most of the time can only handle two
> > displays at once, and if you force all three to go, it'll lead to gpu stalls.
> 
> I don't think there's any such direct connection.
> 
> 
> Does
> 
>  Option "ColorTiling2D" "off"
> 
> prevent the GPU lockups?

There was no gpu lockups until *AFTER* i forced enabling of three panels at
once and rebooted the system. The only fix i had was to reinstall fglrx to get
xorg working again.

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