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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [GM45 backlight] LCD waterfall effect on HP 2230s laptop"
href="https://bugs.freedesktop.org/show_bug.cgi?id=72289#c26">Comment # 26</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [GM45 backlight] LCD waterfall effect on HP 2230s laptop"
href="https://bugs.freedesktop.org/show_bug.cgi?id=72289">bug 72289</a>
from <span class="vcard"><a class="email" href="mailto:jza@saunalahti.fi" title="Joonas Saarinen <jza@saunalahti.fi>"> <span class="fn">Joonas Saarinen</span></a>
</span></b>
<pre>Here are some new results (I rebooted between each test).
1) Ubuntu Trusty kernel 3.13.0-19-generic
# intel_reg_write 0x61250 0x00000000 && intel_reg_write 0x61250 0x80000000
No perceivable effect (waterfall effect remains).
2) Ubuntu Trusty kernel 3.13.0-19-generic
# intel_reg_write 0x61250 0x00000000 && intel_reg_write 0x61254 0x15cc07c6 &&
intel_reg_write 0x61250 0xc0000000
The backlight works great.
3) The most recent upstream git Linux kernel
# intel_reg_write 0x61250 0x00000000 && intel_reg_write 0x61250 0x80000000
The brightness adjustment has no effect, constantly maximum brightness.
4) The most recent upstream git Linux kernel
# intel_reg_write 0x61250 0x00000000 && intel_reg_write 0x61254 0x15cc07c6 &&
intel_reg_write 0x61250 0xc0000000
The backlight is stable. However the dynamic range is incorrect. The display
starts to dim when I go below about 40% brightness, all settings above that
correspond max brightness.</pre>
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