Could you please give more details, like the steps to reproduce this problems.
Thanks. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1086745 Title: serial port data THRE comes too early Status in QEMU: New Bug description: When using a serial port with a Linux guest (and host) and the application uses hardware handshake, this fails because the handling of TEMT and/or THRE is not operating properly in such cases. As long as it takes _time_ for the 'real' port to output the data TEMT may not return true. After writing characters to a real port, the driver should timeout the transmission and after the total time expired, TEMT can be set. Some applications i.e. with a simplex modem do: RTS_on, WRITE_data, repeat IOCTL(GET_LSR_INFO), RTS_off, READ_data. At the moment this fails because very early in the transmission, GET_LSR_INFO returns true and the modem transmitter is switched off. I looked in the source (git) and found that 'char_transmit_time' is present. My skills fail to implement it myself. I build and ran the latest git version and found it to fail as decribed above. I hope someone can solve it. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1086745/+subscriptions