[RFC PATCH xserver] modesetting: re-set the crtc's mode when link-status goes BAD

Eric Anholt eric at anholt.net
Fri Mar 31 00:37:55 UTC 2017

Martin Peres <martin.peres at linux.intel.com> writes:

> On 26/01/17 14:37, Martin Peres wrote:
>> Despite all the careful planing of the kernel, a link may become
>> insufficient to handle the currently-set mode. At this point, the
>> kernel should mark this particular configuration as being broken
>> and potentially prune the mode before setting the offending connector's
>> link-status to BAD and send the userspace a hotplug event. This may
>> happen right after a modeset or later on.
>> When available, we should use the link-status information to reset
>> the wanted mode.
>> Signed-off-by: Martin Peres <martin.peres at linux.intel.com>
> The relevant kernel patches have landed in drm-tip about a month ago.
> Eric, would you mind providing feedback on or merging this patch?

The later discussion has sounded like the kernel will (always) prune the
mode when we re-query, meaning that it doesn't make any sense to try to
re-set to the old mode.  Is this not the case?
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