[Bug 95741] Broadwell graphics on Dell XPS13 (early 2015) loses horizontal sync on shift to tty console
bugzilla-daemon at bugzilla.kernel.org
bugzilla-daemon at bugzilla.kernel.org
Thu Jun 4 06:29:23 PDT 2015
https://bugzilla.kernel.org/show_bug.cgi?id=95741
--- Comment #32 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to Jani Nikula from comment #29)
> At the higher resolutions, you may hit bug [1]. We shouldn't enable IPS when
> the pipe pixel rate is greater than 95% of the CDCLK frequency.
>
> I've presumed all or most bugs that get fixed by i915.enable_ips=0 would be
> that. Maybe we have something else there too. But it seems clear to me there
> are several different issues mixed up in this report.
>
> [1] https://bugs.freedesktop.org/show_bug.cgi?id=83497
This has been fixed by
commit 184e4c49484501f3061ae9b267af818c6894fea9
Author: Ville Syrjälä <ville.syrjala at linux.intel.com>
Date: Wed Jun 3 15:45:11 2015 +0300
drm/i915: Don't enable IPS when pixel rate exceeds 95%
in drm-intel-nightly. Please try that, *without* i915.enable_ips parameter, and
report back.
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