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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [regression, bisected] [i915] setting initial watermarks on gen 7 IVYBRIDGE causes blank lines on monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109477#c17">Comment # 17</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED - [regression, bisected] [i915] setting initial watermarks on gen 7 IVYBRIDGE causes blank lines on monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109477">bug 109477</a>
from <span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
<pre>This thing is super mysterious.
Please grab
intel_reg read 0x70080 0x71080 0x72080 0x70280 0x71280 0x72280
intel_reg dump
intel_watermark
before and after
3e869fd34856 ("Revert "drm/i915/fbdev: Actually configure untiled displays"")
I see DMAR is also active. Try booting with 'intel_iommu=igfx_off' passed to
the kernel cmdline to see if that has any effect.</pre>
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