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@mariakoutei42
Ally (RC71L) USB Type-C support display max. resolution, frequency 規格為 7860*4320, 60Hz
建議您可嘗試與其它外接螢幕連接交叉測試,以確認問題是出現在螢幕端還是掌機本身
如造成不便之處,還請見諒