there is no dell driver update but im here for help :D
im user of a10 bios and windows 8.1 x64. muxless switchable based gcn radeon cards ( 7730m and up series ) have dx9 utilization bug. im releasing fixes with him.
uninstall all radeon and hd graphics drivers. pls find ddu uninstaller utility from internet and use it for clean them.
pls install intel hd graphics driver from windows update. ( may be its need twice instal )
pls install radeon hd graphic driver from windows update. ( dont fast reset when done because its installing secretly control panel. pls wait for stop hdd led )
now windows update radeon driver version is 13.251.0.0. if its not there can be find from windows update catalog.
run regedit. pls search "enableulps". where is its location we modifiying like to there.
(All Dword 32bit value)
delete line = CVRULE_ENABLEPALTIMINGSUPPORT
add
KMD_EnableCrossGpuDisplaySupport 1
KMD_XGDDefaultMaxLocalDisplaysPerGpu 1
PP_DeferFirstStateSwitch 1
DALRULE_AllowNativeModeAsDefaultModes 1
GXOUseSclkforProgrammableDispClk 1
DP_NotSendingLTMessage 1
and dont forget select power saver for flashplugin object from catalyst control panel
( start firefox start flash video exit and right click on desktop switchable graphics option )