[Bug 109477] [regression, bisected] [i915] setting initial watermarks on gen 7 IVYBRIDGE causes blank lines on monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109477

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #6 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
All the numbers look very much correct :/

Does the corruption go away if you start X (or whatever) that enables the
hardware cursor? The watermark dumps at least seemed to be w/o the cursor.

I see the BIOS is pretty old. Can you try to update it?

Let's also try to figure out which watermark level is the problem.
Please do these tests with drm-tip because it might not work with an older
kernel.

First let's rule out LP3:
# echo '12 4 16 0' > /sys/kernel/debug/dri/0/i915_pri_wm_latency
# echo '12 4 16 0' > /sys/kernel/debug/dri/0/i915_cur_wm_latency
$ xset dpms force off ; xset dpms force on
Still corrupted?

Then LP2:
# echo '12 4 0 0' > /sys/kernel/debug/dri/0/i915_pri_wm_latency
# echo '12 4 0 0' > /sys/kernel/debug/dri/0/i915_cur_wm_latency
$ xset dpms force off ; xset dpms force on
Still corrupted?

And finally LP1:
# echo '12 0 0 0' > /sys/kernel/debug/dri/0/i915_pri_wm_latency
# echo '12 0 0 0' > /sys/kernel/debug/dri/0/i915_cur_wm_latency
$ xset dpms force off ; xset dpms force on
Still corrupted?

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