[Bug 95741] Broadwell graphics on Dell XPS13 (early 2015) loses horizontal sync on shift to tty console

[bugzilla-daemon at bugzilla.kernel.org]

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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