https://bugzilla.kernel.org/show_bug.cgi?id=32862
Summary: acer_wmi partially crashes ACPI/EC (Aspire 8930G) Product: ACPI Version: 2.5 Kernel Version: 2.6.38-gentoo-r1 Platform: All OS/Version: Linux Tree: Mainline Status: NEW Severity: high Priority: P1 Component: Other AssignedTo: acpi_ot...@kernel-bugs.osdl.org ReportedBy: hec...@marcansoft.com Regression: Yes laptop model: Acer Aspire 8930G When the acer-wmi module is loaded, parts of ACPI go haywire. The immediate symptom is that backlight control stops working, logging messages like the following: kernel: ACPI Error: Method parse/execution failed [\_SB_.PCI0.PEGP.EVGA.LCD_._BCM] (Node ffff88013fc2b820), AE_AML_INFINITE_LOOP (20110112/psparse-536) kernel: ACPI Error: Evaluating _BCM failed (20110112/video-365) ACPI: Failed to switch the brightness I suspect it's waiting for some kind of state from the EC which never arrives. Not loading acer_wmi solves the issue and brightness control works since that uses the ACPI video driver anyway (however, this might have other negative consequences regarding e.g. rfkill as others have mentioned before). However, the issue is more severe than this. After shutting down and restarting the computer, or rebooting, the machine hangs during POST with no video and no backlight. This persists even if more reboots are attempted. The only way to clear this state is to disconnect AC power, and remove the battery. This is why I suspect the EC is hanging. acer-wmi on 2.6.37-gentoo didn't have these issues. -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are watching the assignee of the bug. ------------------------------------------------------------------------------ Xperia(TM) PLAY It's a major breakthrough. An authentic gaming smartphone on the nation's most reliable network. And it wants your games. http://p.sf.net/sfu/verizon-sfdev _______________________________________________ acpi-bugzilla mailing list acpi-bugzilla@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla