Date: Mon, 15 Sep 2014 17:31:50 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 193500] Interrupt storm after loading i915kms module on Gen4 Intel GPU Message-ID: <bug-193500-8-RyB0Ev7XNc@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-193500-8@https.bugs.freebsd.org/bugzilla/> References: <bug-193500-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193500 --- Comment #11 from jan.kokemueller@gmail.com --- Created attachment 147358 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=147358&action=edit Fix/workaround for interrupt storm on GM45 when loading i915kms This seems to be a known hardware quirk with the GM45 GPU where the gmbus can generate both MSI and non-MSI interrupts: http://lists.freedesktop.org/archives/dri-devel/2013-March/036295.html I've managed to stop the interrupts with the attached patch. The first part restarts the IRQ stuff before calling intel_opregion_init. The second part just makes sure that intel_opregion_enable_asle called from the irq_postinstall handler in drm_irq_install has no effect, as this is called again in intel_opregion_init. I've tested this on 10-stable with the drm stuff backported and will now check if it also works with a recent snapshot of -current. -- You are receiving this mail because: You are the assignee for the bug.
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