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Date: Fri, 21 Dec 2007 14:36:38 -0800 (PST) From: Andrei Gaponenko <andrei.gaponenko@...n.ch> To: linux-kernel@...r.kernel.org cc: rui.zhang@...el.com, corentincj@...aif.net, sziwan@...rs.sourceforge.net Subject: video breaks asus-laptop display switching Hi, With 2.6.23 or newer (including 2.6.24-rc6) kernels, writing to the /sys/devices/platform/asus-laptop/display file does not do anything: Cold boot to single user, then connect an external monitor # cat /sys/devices/platform/asus-laptop/display 1 OK, only the built in LCD is enabled. Try to enable the external monitor as well: # echo 3 > /sys/devices/platform/asus-laptop/display still no image on the external. # cat /sys/devices/platform/asus-laptop/display 1 Still "1", not the "3" we wrote. On the other hand if I boot with an external monitor attached, the "display" file always contains 3, even after writing 1 there, and there is image on both monitors. In 2.6.22 I had to load asus-laptop by hand, but then display switching worked nicely. I've noticed that if I do # rmmod video display switching starts working again with the newer kernels. The "video" module was auto-loaded on my system in 2.6.22, but did not cause the conflict. This is an ASUS Z71V based notebook (detected as M7V). Regards, Andrei -- 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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