[PATCH xserver] modesetting: Remove ms_crtc_msc_to_kernel_msc().

[Mario Kleiner]

On Fri, May 4, 2018 at 6:16 PM, Mike Lothian <mike at fireburn.co.uk> wrote:
> Hi Mario
>
> Thanks for finding this
>
> Tested-by: Mike Lothian <mike at fireburn.co.uk>
>

That tested-by means it doesn't cause new harm, right? Not that it
solves the plasmashell or steam freezes on itself?
-mario

> Cheers
>
> Mike
>
> On 4 May 2018 at 14:02, Mario Kleiner <mario.kleiner.de at gmail.com> wrote:
>> Hi Daniel, Eero,
>>
>> On Fri, May 4, 2018 at 2:41 PM, Daniel Stone <daniel at fooishbar.org> wrote:
>>> Hi Mario,
>>>
>>> On 4 May 2018 at 13:14, Mario Kleiner <mario.kleiner.de at gmail.com> wrote:
>>>> Indeed, i found a Mesa bug yesterday which can cause Mesa's
>>>> PresentPixmap request to spuriously feed garbage targetMSC's
>>>> into the driver under some conditions. However, while other
>>>> video drivers seem to cope relatively well with that, modesetting
>>>> ddx causes KDE-5's plasmashell to lock up badly quite frequently,
>>>> and my suspicion is that the code removed in this commit is one
>>>> major source of the extra fragility.
>>>
>>> Thanks a lot for tracking this down! Adding Eero to Cc, who I think
>>> stumbled on this very problem.
>>
>> You mean the Mesa bug? I'll quickly send out something half finished
>> for discussion to mesa-devel, cc'ed to xorg-devel, which "fixes" the
>> bug in two different ways, both are not optimal, but better than
>> nothing. Lacking this fix, KDE-5 is pretty much unusable due to
>> frequent lockup on server 1.20 with the modesetting-ddx atm.
>>
>> -mario
>>
>>>
>>> Cheers,
>>> Daniel
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