<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html; charset=ISO-8859-15" http-equiv="Content-Type"> <title></title> </head> <body bgcolor="#ffffff" text="#000000"> 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 <a class="moz-txt-link-rfc2396E" href="mailto:yakui.zhao@intel.com"><yakui.zhao@intel.com></a> 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 <a class="moz-txt-link-rfc2396E" href="mailto:yakui.zhao@intel.com"><yakui.zhao@intel.com></a> Tested-by: Zhao Yakui <a class="moz-txt-link-rfc2396E" href="mailto:yakui.zhao@intel.com"><yakui.zhao@intel.com></a> [zhenyuw: cleanups, fix typo for checking GSE irq and convert to current irq handling logic.] Signed-off-by: Zhenyu Wang <a class="moz-txt-link-rfc2396E" href="mailto:zhenyuw@linux.intel.com"><zhenyuw@linux.intel.com></a> Signed-off-by: Eric Anholt <a class="moz-txt-link-rfc2396E" href="mailto:eric@anholt.net"><eric@anholt.net></a> :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 <a class="moz-txt-link-abbreviated" href="mailto:massimo@mmmm.it">massimo@mmmm.it</a> Il 18/07/2010 14:57, Chris Wilson ha scritto: <blockquote cite="mid:8u3s94$fvmkvd@orsmga002.jf.intel.com" type="cite"> <pre wrap="">On Sun, 18 Jul 2010 14:29:34 +0200, Massimo Maggi <a class="moz-txt-link-rfc2396E" href="mailto:massimo@mmmm.it"><massimo@mmmm.it></a> wrote: </pre> <blockquote type="cite"> <pre wrap="">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. </pre> </blockquote> <pre wrap=""> 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... </pre> </blockquote> </body> </html>