Public bug reported: QEMU 2.5.0, SeaBIOS 1.9.1; I've been noticing this bug for quite a while, though.
Steps to reproduce: # Create a VM image, install DOS in it (doesn't matter which) and launch it. # Launch a "bare DOS" DPMI host (not an operating system) in it; I tested with CWSDPMI and HDPMI32. # Run a go32v2 program which reads keyboard input (say, the Lua interpreter: <http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/1.1/repos/devel/lua.zip>; the Free Pascal IDE will also do; on the other hand, DOS/4GW programs seem unaffected). # Quickly type in something random (e.g. alternate between hitting "p" and "q"), then optionally move the cursor left and right. # Observe how some keystrokes are missed, and some are caught twice. The issue does NOT arise: * on bare metal DOS, * in VirtualBox, * in Bochs with stock Plex86 BIOS, * in Bochs with SeaBIOS, * in DOSEMU, * in DOSBox, * in QEMU when the DPMI host is Windows 3.11/9x so at this point I'm reasonably sure that it's the fault of either QEMU or SeaBIOS, and probably the former. The issue arises regardless of whether KVM is enabled. ** Affects: qemu Importance: Undecided Status: New -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1574246 Title: Drunken keyboard in go32v2 programs Status in QEMU: New Bug description: QEMU 2.5.0, SeaBIOS 1.9.1; I've been noticing this bug for quite a while, though. Steps to reproduce: # Create a VM image, install DOS in it (doesn't matter which) and launch it. # Launch a "bare DOS" DPMI host (not an operating system) in it; I tested with CWSDPMI and HDPMI32. # Run a go32v2 program which reads keyboard input (say, the Lua interpreter: <http://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/distributions/1.1/repos/devel/lua.zip>; the Free Pascal IDE will also do; on the other hand, DOS/4GW programs seem unaffected). # Quickly type in something random (e.g. alternate between hitting "p" and "q"), then optionally move the cursor left and right. # Observe how some keystrokes are missed, and some are caught twice. The issue does NOT arise: * on bare metal DOS, * in VirtualBox, * in Bochs with stock Plex86 BIOS, * in Bochs with SeaBIOS, * in DOSEMU, * in DOSBox, * in QEMU when the DPMI host is Windows 3.11/9x so at this point I'm reasonably sure that it's the fault of either QEMU or SeaBIOS, and probably the former. The issue arises regardless of whether KVM is enabled. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1574246/+subscriptions
