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[Bogdan <568611@xxxxxxxxxxxxxxxxxx>]

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: pci@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.

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https://bugs.launchpad.net/bugs/568611

Title:
  Screen brightness control fails on Dell Studio 1558