![]() AMD Radeon HD 6970M / BARTS ChipID=0圆720. ![]() AMD Radeon HD 6770M / TURKS ChipID=0圆740Īnd model iMac12,2 aslo has two dedicated graphics options:.AMD Radeon HD 6750M / TURKS ChipID=0圆741.I find a clue that, model iMac12,1 has two dedicated graphics options: It's reported that backlight can be adjusted on iMac12,2 (27" 2011).Īnd some people can do on iMac12,1, whereas some can not. Only reboot can restore the original brightness. The display will get stuck in discomfortable highest brightness after resuming from suspend. Though the value of can be changed, the display stays unchanged. Or use the DE brightness applet which updates the aforenamed file. I can manually modify the value of /sys/class/backlight/acpi_video0/brightness, Under /sys/class/backlight/, ACPI exposed only acpi_video0, but no radeon_bl0.
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