Re: no brightness with acpi video since 3.3 [was Re: Issues with the sony-platform module]

[Karol Babioch <karol@babioch.de>]

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Hi,

Am 19.06.2012 02:59, schrieb Zhang Rui:
> so ACPI video driver is used before 3.3 and it works?
> please try this patch
> https://bugzilla.kernel.org/attachment.cgi?id=73576
> and boot without acpi_backlight=vendor and see if it helps.
First of all: Unfortunately I still can't change the brightness. But I
couldn't reproduce a working solution with 3.3 and earlier (although it
definitely worked with 3.0/3.1 at some point in the past), so it
probably isn't your fault.

But the patch fixes another huge problem: It finally let's me boot a
3.4 kernel with KMS enabled. Beforehand I would get a black/blank
screen with kernels 3.4 and higher. This was some kind of a regression,
as I've experienced this kind of issue also with 2.6.38 and earlier. The
bug is filed here [1] and there are quite a few people affected by
it. So, thanks a lot for that!

Best regards,
Karol Babioch

[1] https://bugs.freedesktop.org/show_bug.cgi?id=50175


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