https://bugs.freedesktop.org/show_bug.cgi?id=31920
Summary: Brightness control is erratic
(/sys/class/backlight/nv_backlight/max_brightness is
wrong)
Product: xorg
Version: git
Platform: Other
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Driver/nouveau
AssignedTo: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
I have a Sony Vaio CW2 laptop, with an Nvidia GeForce 310M card. I am using the
nouveau driver from git (via the xorg-edgers ubuntu repository). I have to say
it works really well - I even get desktop effects in KDE with Gallium.
However, there is one problem with screen brightness. The max_brightness value
for the backlight interface (/sys/class/backlight/nv_backlight/max_brightness)
is set to 1025. When I use KDE power-devil (or any brightness control tool), it
reduces the brightness by tiny fractions, which still keeps the screen at full
brightness. The brightness actually varies only between 0 and 127 (128-1025 are
full brightness), and then too only if I change it in increments of 10 or 20. I
think ideally the max_brightness value should be 7 (or 10?) and it should vary
in steps of 1.
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