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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [chv][regression][bisected] Brightness adjustment on Lenovo Miix 320-10ICR and Lenovo Miix2 8 is broken since Linux 5.3rc1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111293#c5">Comment # 5</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [chv][regression][bisected] Brightness adjustment on Lenovo Miix 320-10ICR and Lenovo Miix2 8 is broken since Linux 5.3rc1"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111293">bug 111293</a>
from <span class="vcard"><a class="email" href="mailto:russianneuromancer@ya.ru" title="russianneuromancer@ya.ru">russianneuromancer@ya.ru</a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=144959" name="attach_144959" title="drm-tip dmesg with drm.debug=0x1e from Lenovo Miix2 8">attachment 144959</a> <a href="attachment.cgi?id=144959&action=edit" title="drm-tip dmesg with drm.debug=0x1e from Lenovo Miix2 8">[details]</a></span>
drm-tip dmesg with drm.debug=0x1e from Lenovo Miix2 8
As I just found same issue is reproducible on Lenovo Miix2 8 too.
Attached log is from drm-tip 2019-08-05
(2bb7df95d4e058e61d9de39f1b97404592708d24)
<span class="quote">> If the acpi driver exposed a /sys/class/backlight, xf86-video-intel should have still found it.</span >
Lenovo Miix2 8, Lenovo Miix 320-10IRC
On Linux 5.2 there is just one intel_backlight, adjusting brightness via
intel_backlight works.
Lenovo Miix2 8:
On Linux 5.3 there is acpi_video0 and acpi_video1, echo values to brightness
file in each one doesn't change backlight level.
Lenovo Miix 320-10IRC:
On Linux 5.3 there is...
~# ls /sys/class/backlight
acpi_video0 acpi_video1 acpi_video2 acpi_video3 acpi_video4 acpi_video5
acpi_video6 acpi_video7
As with Lenovo Miix2 8, echo values to brightness file in each acpi_video
doesn't change backlight level.</pre>
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