Red Hat Bugzilla – Bug 340351
Brightness applet only works over half the range of the display
Last modified: 2013-03-05 22:53:33 EST
Description of problem:
My display (ThinkPad T61 with NVidia Quadro NV140M) has a brightness control
that operates over 15 steps, from dimmest to brightest.
If I try to control the brightness with gnome-brightness-applet, the slider only
changes brightness over half the total range. If the brightness starts high,
the slider changes from brightest to half-bright. If the brightness starts low,
the slider changes the brightness from dimmest to half-bright.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Change brightness using gnome-brightness-applet.
Brightness changes from brightest to dimmest setting.
This is the Xorg Vesa driver. (The Xorg NV driver doesn't work with this card.)
(In reply to comment #0)
> My display [...] has a brightness control that operates over 15 steps,
Where is such control is located?
I have the full brightness (as I have ever seen, it looks perfect) on AC power.
But on batteries even with
Dim display brightness by: 0%
the screen is too dim, I have to change the color scheme and it is hard to read.
acpitool -l 7
It sets the brightness on the batteries as is on the AC power. The
best-there-is (0% dim) brightness on the batteries corresponds to approx. the
"-l" level 6.1.
Also using the VESA driver but on ATI:
01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility X1400
(In reply to comment #1)
> acpitool -l 7
Not sure what it is related to but at least on
it does no longer (IIRC it really worked in Comment 1) work - the display is
more dim on batteries than on AC, even after `acpitool -l 7'.
(In reply to comment #1)
> (In reply to comment #0)
> > My display [...] has a brightness control that operates over 15 steps,
> Where is such control is located?
On the ThinkPad T61, this is <Fn>-<Home> (one step brighter) and <Fn>-<End> (one
If I use this control, the brightness indicator (either the GNOME one or the tpb
one) runs over seven steps from brightest to dimmest on the indicator (but only
the middle of the possible range). On the next step, the panel dims another
step, but the indicator goes back to brightest. For the remaining steps, the
indicator drops until it reaches the dimmest setting for the second time. (The
behavior is reversed for brightening.)
If I use the appletslider, it only adjusts over the upper seven steps or the
lower seven steps, depending on where it starts.
> I have the full brightness (as I have ever seen, it looks perfect) on AC power.
> But on batteries even with
> Dim display brightness by: 0%
> the screen is too dim, I have to change the color scheme and it is hard to read.
> acpitool -l 7
> It sets the brightness on the batteries as is on the AC power. The
> best-there-is (0% dim) brightness on the batteries corresponds to approx. the
> "-l" level 6.1.
> Also using the VESA driver but on ATI:
> 01:00.0 VGA compatible controller: ATI Technologies Inc Radeon Mobility X1400
Is this the same bug?
BTW, the behavior is the same for the vesa, nv (now working), and proprietary
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