After 14 builds (never tought that PXE and Core2Quad were so useful!!).... the bad commit is:
01c66889c14aa163c49355b3be2ccfb214500599 is the first bad commit commit 01c66889c14aa163c49355b3be2ccfb214500599 Author: Zhao Yakui <yakui.z...@intel.com> Date: Wed Oct 28 05:10:00 2009 +0000 drm/i915: Add ACPI OpRegion support for Ironlake Add the support of ACPI opregion on Ironlake so that the backlight brightness can be adjusted by using ACPI interface >/sys/class/backlight/acpi_video0/brightness Signed-off-by: Zhao Yakui <yakui.z...@intel.com> Tested-by: Zhao Yakui <yakui.z...@intel.com> [zhenyuw: cleanups, fix typo for checking GSE irq and convert to current irq handling logic.] Signed-off-by: Zhenyu Wang <zhen...@linux.intel.com> Signed-off-by: Eric Anholt <e...@anholt.net> :040000 040000 79f96cd37f779fb2b33f0e6545e83f32cd5c1372 3b9f77adfeed13386058a46a17e3f4facd8d862c M drivers The problem is *half*-solved... connecting by ssh (as root) and typing # echo -n 10 >/sys/class/backlight/acpi_video0/brightness revives the screen. Starting X gives me a fully working KWin compositing (with OpenGL) I will temporarily put this line in an init script, but I think that this bug must be solved as soon as possible! Another question: How can I be sure that the ATI gpu isn't wasting power while PC is booted in Linux? Best regards, Massimo Maggi mass...@mmmm.it Il 18/07/2010 14:57, Chris Wilson ha scritto: > On Sun, 18 Jul 2010 14:29:34 +0200, Massimo Maggi <mass...@mmmm.it> wrote: >> I've set up a very minimal kernel config (the resulting kernel is not >> useful for anything except showing the problem), and built versions: >> 2.6.32.16 >> 2.6.33.6 >> 2.6.34.1 >> 2.6.35-rc5 >> Only 2.6.32.16 is able to correctly initialize the framebuffer. > Excellent, as you have managed to reproduce this with a minimal kernel, > can you do a bisect between 2.6.33.16 and 2.6.33.6 and see which patch > causes the regression? It should only take a couple of hours. My bet is > one of the Arrandale enabling patches... >
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