Greetings, John
Just ran across the brightness problem on my laptop.
xbacklight -dec 30 works for me.
See man xbacklight for other choices.
Cheers.
Hi folks
1. i) I've got knoppix distro 7.0.2, kernel release 3.3.7, on hard disk.
ii) I use LXDE (Lightweight X Desktop).
iii) and have an Acer Aspire 5750 laptop.
2. I'd like to
a) Be able to adjust screen brightness.
b) Use the power management system to preserve battery power etc.
But at the moment I can't do either. (In Windows 7, both work fine).
3. Re 2.a):
To increase screen brightness with the keyboard, you press Fn+<right-arrow>
(left-arrow to decrease it). But nothing happens. ("Fn" is an actual key (in
blue)).
Could you tell me how to get it working please?
I also tried using "xbacklight -set nn" at a terminal (where nn is the
brightness level). The setting value DOES alter, but it doesn't change the
brightness of the screen. Is this command supposed to work? If so, could you
tell me what's wrong?
4. Re 2.b):
To call up Power Management, I select Kmenu/Preferences/SystemSettings then
select Hardware/PowerManagement. The settings are displayed but the window is
greyed (and you can't change anything), and there is a red square with a white
"X" in it, and under it it says
"Power Management configuration module could not be loaded. The Power
Management Service appears not to be running. This can be solved by starting or
scheduling it inside 'Startup and Shutdown'".
5. So in SystemSettings I selected
SystemAdministration/Startup&Shutdown/ServiceManager. I saw that under Startup
Services, "Power Management" was ticked (under the "Use" column), but under the
"Status" column it said "Not running". (Actually, ALL the entries in Startup
Services said "Not running" in the "Status" column, even though they were all
ticked under "Use").
6. I changed the "Status" of Power Management to "Running", then went back into
SystemSettings/Hardware/PowerManagement. NOW, its window was active, and I
could change the settings. But ...
... Under "Power Profiles", there is a "Display Brightness" slider, but even
though it was ticked, the brightness DIDN'T CHANGE when I repositioned the
slider and clicked "Apply". Do you know why this is?
Also, do you know why the "Advanced Battery Settings" tab was greyed (under
Global Settings)?
7. In ../PowerManagement/GlobalSettings/Settings&Profile/ProfileAssignment,
there are 4 entries, ie:
a) When AC Adaptor is plugged in
b) When AC Adaptor is unplugged
c) When battery is at low level
d) When battery is at warning level
Do you know why for "a)" there is only ONE setting offered (ie "Performance")?
Also there are NO settings offered for b),c),d). Why is this?
8. When I rebooted, and re-entered ../SystemSettings/Hardware/PowerManagement,
it's window was greyed out again (as in 4. above). What is the fix for stopping
this happenning?
In KDE, PowerManagement WASN'T greyed out (whereas in LXDE it was). Why is
this?
However, in KDE the "Advanced Battery Settings" tab WAS still greyed out.
Also in KDE (immediately after a boot) in
SystemSettings/SystemAdministration/Startup&Shutdown/SERVICEMANAGER, under
Startup Services, "Power Management" was "RUNNING". In fact ALL the entries in
Startup Services were "RUNNING".) Why is this the case with KDE but not LXDE?
Sorry for the level of detail.
Your kind help with my questions would be most welcome. Thanks, John.
Greetings, John
Just ran across the brightness problem on my laptop.
xbacklight -dec 30 works for me.
See man xbacklight for other choices.
Cheers.
Last edited by utu; 11-18-2014 at 05:24 AM.
.
Fn-Alt-F4 & Fn-Alt-F5 control backlight brightness down & up,
respectively, on Win7 & Win8 Dell Inspiron laptops.
Fanxiang 4TB 2TB 1TB SSD 550MB/s 2.5'' SATA III Internal Solid State Drive lot
$188.99
Fanxiang M.2 SATA SSD 2TB 1TB 512GB 256GB SSD Internal M2 Solid State Drive Lot
$109.99
4 TB SSD SATA III Drive 2.5" Solid State Drive SATAIII 6Gb/s UP to 540MB/s
$148.00
SAMSUNG SSD 870 EVO 2.5" SATA III Solid State Drive 2TB 1TB 250GB 500GB LOT
$161.82
Patriot P210 128GB 256GB 512GB 1TB 2TB 2.5" SATA 3 6GB/s Internal SSD PC/MAC Lot
$13.99
Samsung 870 EVO 500GB 2.5 Inch SATA III Internal SSD Brand New MZ-77E500B/AM
$34.98
Netac 1TB 2TB 512GB Internal SSD 2.5'' SATA III 6Gb/s Solid State Drive lot
$13.99
Genuine Samsung 850 EVO MZ-75E250 250GB 2.5" SATA III SSD Solid State Drive
$20.00
Fanxiang SSD 512GB 1TB 2TB 4TB 2.5'' SSD SATA III Internal Solid State Drive lot
$107.99
Fanxiang 256GB 512GB 1TB 2TB 4TB Internal SSD 2.5"SATA III Drive Desktop MAC Lot
$188.09