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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [SKL/KBL] Vblank counter issues when DMC takes goes to DC5/DC6 impacting frontbuffer tracking and PSR with X modesetting(0) driver."
href="https://bugs.freedesktop.org/show_bug.cgi?id=94126#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [SKL/KBL] Vblank counter issues when DMC takes goes to DC5/DC6 impacting frontbuffer tracking and PSR with X modesetting(0) driver."
href="https://bugs.freedesktop.org/show_bug.cgi?id=94126">bug 94126</a>
from <span class="vcard"><a class="email" href="mailto:jim.bride@linux.intel.com" title="Jim Bride <jim.bride@linux.intel.com>"> <span class="fn">Jim Bride</span></a>
</span></b>
<pre>I want to do a run with vblank debug messages turned on to ensure that my
understanding of what's going on here is correct, but from looking at the code
I think we should be able to handle this case (where we lose the HW vblank
count due to a power management event) similarly to what would happen if the
counter wrapped around. We'll likely want to modify drm_update_vblank_count()
to ensure that DRM's software counter gets adjusted
properly when we lose our HW counter.</pre>
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