I subsequently tried to install the Intel HD Graphics driver from the Lenovo support site (IN2VDO26WW6.exe), but after rebooting, there is no display after the "Starting Windows" screen. After disabling the driver signing enforcement, it led to the no-display issue, details in the next paragraph. I first tried the HD graphics driver from Intel's website for my processor (i5 430 M) but that had a driver signing issue. I rebooted, but after that, I couldn't roll back the driver (button was greyed out in Device Manager).
When I tried to update my Intel hd graphics driver through Device Manager (Display adapters, right-clicked Intel HD Graphics, Driver tab, "update driver", "search automatically for updated driver software"), Device Manager for some reason changed "Intel HD graphics" to "Standard VGA graphics adapter" and resolution became 800圆00. I have a Lenovo Ideapad Y460 running Win7 圆4 SP1, with switchable graphics - Intel HD / Mobility Radeon 5650.
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