APPLIED: [Trusty] Fix framebuffer hangs with VMs using cirrus gfx

[Tim Gardner]

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On 02/03/2014 10:42 AM, Stefan Bader wrote:
> On 03.02.2014 18:25, Tim Gardner wrote:
>> On 02/03/2014 10:09 AM, Stefan Bader wrote:
>>> On 31.01.2014 11:20, Tim Gardner wrote:
>>>> Ick.
>>>> 
>> 
>>> I got the following feedback from David Herrmann:
>> 
>>>> This should be fixed by patches #1+#2 in this series: 
>>>> http://lists.freedesktop.org/archives/dri-devel/2014-January/052584.html
>>>>
>>>>
>>>>
>>
>>>> 
I hope we can get it applied this week. Just waiting for a rough
>>>> review from airlied. As a workaround, you can always disable
>>>>  CONFIG_X86_SYSFB. There is no reason to activate it right
>>>> now (until SimpleDRM gets merged..).
>> 
>>> So we could either revert my patch and disable
>>> CONFIG_X86_SYSFB (was there a special reason to enable it or
>>> just default policy?) or we wait until these two patches end up
>>> in Linux tree and then revert mine in favour of those. I am not
>>> sure whether they end up on a stable tree if simplefb is as "in
>>> development" as it sounds to me.
>> 
>>> -Stefan
>> 
>>> [1] 
>>> http://lists.freedesktop.org/archives/dri-devel/2014-January/052586.html
>>
>>
>>
>>> 
[2] http://lists.freedesktop.org/archives/dri-devel/2014-January/052585.html
>> 
>> 
>> CONFIG_X86_SYSFB likely was enabled as a matter of policy. The
>> help text suggests that if you don't know what you're doing then
>> say "Y".
>> 
>> I'd be inclined to drop your patch and set CONFIG_X86_SYSFB=n.
>> 
> 
> That would be my thinking as well. That will at least prevent
> unexpected breakage that likely will happen when we do not revert
> it before or when those upstream patches arrive. We can simply flip
> it back to "y" should we really need it. Is that worth an update in
> either the policy or the enforcer? At least I am prone to forget
> why things were done...
> 
> -Stefan
> 

I'll just note this email thread in the 'CONFIG_X86_SYSFB=n' patch.

- -- 
Tim Gardner tim.gardner at canonical.com
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