The name is very poor, but the poulsbo driver is not a "video driver" ,
it is a driver for the backlight
>From the help:
Symbol: STUB_POULSBO [=n]
│
│ Type : tristate
│
│ Prompt: Intel GMA500 Stub Driver
│
│ Defined at drivers/gpu/stub/Kconfig:1
│
│ Depends on: HAS_IOMEM [=y] && PCI [=y] && NET [=y]
│
│ Location:
│
│ -> Device Drivers
│
│ -> Graphics support
│
│ Selects: BACKLIGHT_CLASS_DEVICE [=y] && VIDEO_OUTPUT_CONTROL [=m] &&
INPUT [=y] && ACPI
So if the psb_gfx were to fail, it falls back to VESA , or fails
completely (depends on the kernel), but it does not "fall back" to the
poulsbo driver.
The backlight works WITHOUT the poulsbo driver.
well "works" with a script to manage brightness as my function keys do
not always work, even with the kernel options "acpi_backlight=vendor and
acpi_osi=Linux". Honestly I am not sure what the poulsbo driver is used
for, AFIK it can be completely removed.
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https://bugs.launchpad.net/bugs/899244
Title:
GMA500 psb_gfx
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