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Date: Wed, 26 Oct 2011 19:18:24 +0200 From: Wim Goeman <wimgoeman@...il.com> To: linux-kernel@...r.kernel.org Subject: vga_switcheroo causes system freeze Hi, I am working with a new HP PC (dv7) which supports Hybrid Graphics in terms of the intel graphics and radeon graphics (as can bee found in lspci). Currently I am only working with the Intel integrated graphics, and both adapters are powered on. My goal was to deactivate the intel graphics and activate the radeon graphics, as the machine is plugged in to the power supply most of the time. To achieve this I tried the following: cat /sys/kernel/debug/vga_switcheroo/switch --> shows both cards are powered on and IGD is in use (the intel card) echo DIS > /sys/kernel/debug/vga_switcheroo/switch --> gives an error message because X is still running I kill the X session echo DIS > /sys/kernel/debug/vga_switcheroo/switch --> The system freezes completely. No warning or error, no blinking cursor, nothing. I have to power off using the power button. Does anyone have a suggestion on what I can try to fix this? I am posting on the mailing list because the bug tracker seems to be down since a few days now. For more details, please see launchpad bug #881132 Thanks in advance for having a look at this, Wim -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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