===== 尊重原分享者, 在這裡保留原文節錄與發文者的暱稱 ====
open regedit and find
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Video\{XXXX...}\0000
( 'XXXX' means device number. There are several device number folder and u should find 'AdapterDesc' in 0000 folder which key value is 'amd radeon HD 7XXX Series'. )
At that '0000' folder, Change 'PP_SclkDeepSleepDisable REG_DWORD' value 0 to 1.
and reboot~!~!~!