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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