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.
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:
descripti on: VGA compatible controller
product: Mobile 4 Series Chipset Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
version: 09
capabilit ies: msi pm vga_controller bus_master cap_list rom
configura tion: driver=i915 latency=0
resources : irq:44 memory: 90000000- 903fffff memory: 80000000- 8fffffff ioport:4110(size=8)
*-display:0
bus info: pci@0000:00:02.0
width: 64 bits
clock: 33MHz
Please let me know if there's anything else I can do to help.