[Bug 72289] [GM45 backlight] LCD waterfall effect on HP 2230s laptop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72289

--- Comment #32 from Joonas Saarinen <jza at saunalahti.fi> ---
Ok, apparently in the current drm-intel the render ring bug does not appear
anymore. So some updated info.

Before touching registers manually, the panel still flickers. The other results
are also similar as before.

# intel_reg_write 0x61250 0x00000000 && intel_reg_write 0x61250 0x80000000

Result: always maximum brightness.

# intel_reg_write 0x61250 0x00000000 && intel_reg_write 0x61254 0x15cc07c6 &&
intel_reg_write 0x61250 0xc0000000

Result: backlight ok, but the dynamic range is wrong.

Will attach dmesg and i915_opregion (before any register writes).

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