id summary reporter owner description type status component version resolution keywords cc guest host 7712 framebuffer color error ganquan "HOST OS: win xp[[BR]] GUEST OS:Debian testing I write a program which has two threads. Thread A writes data to /dev/fb0, to paint the whole screen as red{255, 0, 0}, green{0, 255, 0}, blue{0, 0, 255}, white{255, 255, 255}, gray{110, 110, 110} every 1 second. After A paints screen complete, Thread B read from /dev/fb0 and save the whole screen data and use libgd to save the screenshot as a jpeg image every 1 second. The two threads work synchronized well. Howerver,Thread A paints the screen well, all color is correct, Thread B gets some colors error. blue becomes black, white becomes yellow, gray becomes dark yellow. Red and green is correctly.[[BR]] I recompile my program and run it on VMware workstation(HOST OS winxp and GUEST OS debian testing, everything is same as Virtulbox's HOST OS and GUEST OS), both thread A and thread B work correctly. No color error. p.s. I set the GUEST OS ""vga = 0x0318"" at the end of line which locate kernel image. So /dev/fb0 should be 1024x768 24bits color mode." defect closed other VirtualBox 3.2.10 worksforme framebuffer Linux Windows