20 lines
701 B
Diff
20 lines
701 B
Diff
diff --git a/backend/plustek-usbhw.c b/backend/plustek-usbhw.c
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index 05d3cc7..28cbd52 100644
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--- a/backend/plustek-usbhw.c
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+++ b/backend/plustek-usbhw.c
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@@ -1451,6 +1451,14 @@ usb_ResetRegisters( Plustek_Device *dev )
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* CanoScan devices to work properly after power-up
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*/
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sanei_lm983x_write_byte( dev->fd, 0x5b, regs[0x5b] );
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+
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+ /* At least CanoScan N650U can have a problem with writing
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+ * to register 0x59 due XHCI USB controller is too
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+ * fast for him. Simulate EHCI USB controller's
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+ * behavior here - wait 1ms.
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+ */
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+ usleep(1000);
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+
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sanei_lm983x_write_byte( dev->fd, 0x59, regs[0x59] );
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sanei_lm983x_write_byte( dev->fd, 0x5a, regs[0x5a] );
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} else {
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