Dear Kamal, thank you for continuous support and help with this issue.
$ cat max_brightness
368475
$ echo 368475 | sudo tee brightness
368475
The above makes the screen totally black.
$ echo 0 | sudo tee brightness
0
Zero sets the screen to maximal brightness.
$ echo 184000 | sudo tee brightness
184000
This yields about half-bright screen.
Other values I've tried (10000, 350000) also support the pattern of
"inverted brightness numbers".
lshw gives this in the first "display" entry:
*-display:0
description: VGA compatible controller
product: Mobile 4 Series Chipset Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: p...@0000:00:02.0
version: 09
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:44 memory:90000000-903fffff
memory:80000000-8fffffff ioport:4110(size=8)
Please let me know if there's anything else I can do to help.
--
You received this bug notification because you are a member of Registry
Administrators, which is the registrant for NULL Project.
https://bugs.launchpad.net/bugs/568611
Title:
Screen brightness control fails on Dell Studio 1558
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