[Bug 75211] Division error in radeon_compute_pll_avivo (X hang)

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=75211

--- Comment #9 from Darren Salt <bugspam@moreofthesa.me.uk> ---
No crash now.

However, the kernel log is spammed with
  [drm:drm_crtc_helper_set_config] *ERROR* failed to set mode on [CRTC:14]

I did notice what looked like some X spam too, but that's been lost over an X
restart; fairly sure that it was ‘invalid argument’ (which would correspond to
that -EINVAL). I had to kill it (telling it that it had segfaulted worked
nicely) and there's no evidence of that in Xorg.0.log.old.

I'd say that that DRM error needs to be rate-limited and/or X needs to give up,
or at least do something different than what it currently does, if it can't set
the mode. (I may be able to get more information about what X is doing if it's
needed, but it seemed more important to report these findings first; and that
information belongs elsewhere anyway.)

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