I've successfully started Xorg on the Sid/QEMU. It seems Quadra 800 framebuffer supports only limited set of resolution and color set modes.
According to Quadra 800 page at Everymac https://everymac.com/systems/apple/mac_quadra/specs/mac_quadra_800.html it supports "With 1 MB of VRAM installed, it can support 640x480, 800x600 and 832x624 at 16-bit color and 1024x768 and 1152x870 at 8-bit color." it corresponds to the https://elixir.bootlin.com/linux/v5.6/source/drivers/video/fbdev/macmodes.h I've started QEMU with -g 800x600x16 -display gtk and Xorg started with default (auto) config! ..Mailing list processor can't pass screenshots Log: === X.Org X Server 1.20.8 X Protocol Version 11, Revision 0 [ 5795.120] Build Operating System: Linux 4.9.0-11-amd64 m68k Debian [ 5795.122] Current Operating System: Linux quadra800 5.6.0-1-m68k #1 Debian 5.6.7-1 (2020-04-29) m68k [ 5795.123] Kernel command line: console=ttyS0 root=/dev/sda2 [ 5795.128] Build Date: 31 March 2020 10:14:40AM [ 5795.131] xorg-server 2:1.20.8-2 (https://www.debian.org/support) [ 5795.134] Current version of pixman: 0.36.0 [ 5795.141] Before reporting problems, check http://wiki.x.org to make sure that you have the latest version. [ 5795.142] Markers: (--) probed, (**) from config file, (==) default setting, (++) from command line, (!!) notice, (II) informational, (WW) warning, (EE) error, (NI) not implemented, (??) unknown. [ 5795.160] (==) Log file: "/var/log/Xorg.0.log", Time: Tue May 19 17:27:37 2020 [ 5795.171] (==) Using system config directory "/usr/share/X11/xorg.conf.d" [ 5795.184] (==) No Layout section. Using the first Screen section. [ 5795.185] (==) No screen section available. Using defaults. [ 5795.185] (**) |-->Screen "Default Screen Section" (0) [ 5795.185] (**) | |-->Monitor "<default monitor>" [ 5795.192] (==) No monitor specified for screen "Default Screen Section". Using a default monitor configuration. [ 5795.193] (==) Automatically adding devices [ 5795.193] (==) Automatically enabling devices [ 5795.193] (==) Automatically adding GPU devices [ 5795.195] (==) Max clients allowed: 256, resource mask: 0x1fffff [ 5795.196] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist. [ 5795.196] Entry deleted from font path. [ 5795.197] (==) FontPath set to: /usr/share/fonts/X11/misc, /usr/share/fonts/X11/100dpi/:unscaled, /usr/share/fonts/X11/75dpi/:unscaled, /usr/share/fonts/X11/Type1, /usr/share/fonts/X11/100dpi, /usr/share/fonts/X11/75dpi, built-ins [ 5795.197] (==) ModulePath set to "/usr/lib/xorg/modules" [ 5795.199] (II) The server relies on udev to provide the list of input devices. If no devices become available, reconfigure udev or disable AutoAddDevices. [ 5795.199] (II) Loader magic: 0xd01f5468 [ 5795.200] (II) Module ABI versions: [ 5795.200] X.Org ANSI C Emulation: 0.4 [ 5795.200] X.Org Video Driver: 24.1 [ 5795.200] X.Org XInput driver : 24.1 [ 5795.200] X.Org Server Extension : 10.0 [ 5795.309] (--) using VT number 2 [ 5795.310] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration [ 5795.317] (II) no primary bus or device found [ 5795.322] (II) LoadModule: "glx" [ 5795.339] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so [ 5795.353] (II) Module glx: vendor="X.Org Foundation" [ 5795.354] compiled for 1.20.8, module version = 1.0.0 [ 5795.355] ABI class: X.Org Server Extension, version 10.0 [ 5795.357] (==) Matched modesetting as autoconfigured driver 0 [ 5795.357] (==) Matched fbdev as autoconfigured driver 1 [ 5795.357] (==) Assigned the driver to the xf86ConfigLayout [ 5795.358] (II) LoadModule: "modesetting" [ 5795.359] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so [ 5795.360] (II) Module modesetting: vendor="X.Org Foundation" [ 5795.361] compiled for 1.20.8, module version = 1.20.8 [ 5795.361] Module class: X.Org Video Driver [ 5795.361] ABI class: X.Org Video Driver, version 24.1 [ 5795.361] (II) LoadModule: "fbdev" [ 5795.363] (II) Loading /usr/lib/xorg/modules/drivers/fbdev_drv.so [ 5795.365] (II) Module fbdev: vendor="X.Org Foundation" [ 5795.365] compiled for 1.20.0, module version = 0.5.0 [ 5795.365] Module class: X.Org Video Driver [ 5795.366] ABI class: X.Org Video Driver, version 24.0 [ 5795.366] (II) modesetting: Driver for Modesetting Kernel Drivers: kms [ 5795.367] (II) FBDEV: driver for framebuffer: fbdev [ 5795.404] (WW) Falling back to old probe method for modesetting [ 5795.408] (EE) open /dev/dri/card0: No such file or directory [ 5795.409] (WW) Falling back to old probe method for fbdev [ 5795.409] (II) Loading sub module "fbdevhw" [ 5795.409] (II) LoadModule: "fbdevhw" [ 5795.411] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so [ 5795.413] (II) Module fbdevhw: vendor="X.Org Foundation" [ 5795.413] compiled for 1.20.8, module version = 0.0.2 [ 5795.413] ABI class: X.Org Video Driver, version 24.1 [ 5795.420] (II) FBDEV(0): using default device [ 5795.421] (WW) VGA arbiter: cannot open kernel arbiter, no multi-card support [ 5795.424] (II) FBDEV(0): Creating default Display subsection in Screen section "Default Screen Section" for depth/fbbpp 15/16 [ 5795.425] (==) FBDEV(0): Depth 15, (==) framebuffer bpp 16 [ 5795.425] (==) FBDEV(0): RGB weight 555 [ 5795.426] (==) FBDEV(0): Default visual is TrueColor [ 5795.426] (==) FBDEV(0): Using gamma correction (1.0, 1.0, 1.0) [ 5795.427] (II) FBDEV(0): hardware: DAFB (video memory: 937kB) [ 5795.427] (DB) xf86MergeOutputClassOptions unsupported bus type 0 [ 5795.428] (II) FBDEV(0): checking modes against framebuffer device... [ 5795.428] (II) FBDEV(0): checking modes against monitor... [ 5795.429] (II) FBDEV(0): Virtual size is 800x600 (pitch 800) [ 5795.429] (**) FBDEV(0): Built-in mode "current": 48.0 MHz, 46.9 kHz, 75.1 Hz [ 5795.430] (II) FBDEV(0): Modeline "current"x0.0 48.00 800 832 928 1024 600 604 608 624 -hsync -vsync -csync (46.9 kHz b) [ 5795.431] (==) FBDEV(0): DPI set to (96, 96) [ 5795.431] (II) Loading sub module "fb" [ 5795.431] (II) LoadModule: "fb" [ 5795.432] (II) Loading /usr/lib/xorg/modules/libfb.so [ 5795.434] (II) Module fb: vendor="X.Org Foundation" [ 5795.435] compiled for 1.20.8, module version = 1.0.0 [ 5795.435] ABI class: X.Org ANSI C Emulation, version 0.4 [ 5795.435] (**) FBDEV(0): using shadow framebuffer [ 5795.435] (II) Loading sub module "shadow" [ 5795.435] (II) LoadModule: "shadow" [ 5795.436] (II) Loading /usr/lib/xorg/modules/libshadow.so [ 5795.438] (II) Module shadow: vendor="X.Org Foundation" [ 5795.438] compiled for 1.20.8, module version = 1.1.0 [ 5795.438] ABI class: X.Org ANSI C Emulation, version 0.4 [ 5795.439] (II) UnloadModule: "modesetting" [ 5795.440] (II) Unloading modesetting [ 5795.449] (II) FBDEV(0): FBIOBLANK: Invalid argument (Screen blanking not supported by kernel - disabling) [ 5795.462] (==) FBDEV(0): Backing store enabled [ 5795.471] (==) FBDEV(0): DPMS enabled [ 5795.474] (II) Initializing extension Generic Event Extension [ 5795.479] (II) Initializing extension SHAPE [ 5795.484] (II) Initializing extension MIT-SHM [ 5795.489] (II) Initializing extension XInputExtension [ 5795.496] (II) Initializing extension XTEST [ 5795.500] (II) Initializing extension BIG-REQUESTS [ 5795.505] (II) Initializing extension SYNC [ 5795.510] (II) Initializing extension XKEYBOARD [ 5795.515] (II) Initializing extension XC-MISC [ 5795.520] (II) Initializing extension SECURITY [ 5795.526] (II) Initializing extension XFIXES [ 5795.533] (II) Initializing extension RENDER [ 5795.538] (II) Initializing extension RANDR [ 5795.549] (II) Initializing extension COMPOSITE [ 5795.556] (II) Initializing extension DAMAGE [ 5795.561] (II) Initializing extension MIT-SCREEN-SAVER [ 5795.566] (II) Initializing extension DOUBLE-BUFFER [ 5795.571] (II) Initializing extension RECORD [ 5795.579] (II) Initializing extension DPMS [ 5795.586] (II) Initializing extension Present [ 5795.593] (II) Initializing extension DRI3 [ 5795.593] (II) Initializing extension X-Resource [ 5795.598] (II) Initializing extension XVideo [ 5795.603] (II) Initializing extension XVideo-MotionCompensation [ 5795.603] (II) Initializing extension SELinux [ 5795.603] (II) SELinux: Disabled on system [ 5795.603] (II) Initializing extension GLX [ 5795.611] (II) AIGLX: Screen 0 is not DRI2 capable [ 5795.715] (II) IGLX: Loaded and initialized swrast [ 5795.715] (II) GLX: Initialized DRISWRAST GL provider for screen 0 [ 5795.716] (II) Initializing extension XFree86-VidModeExtension [ 5795.721] (II) Initializing extension XFree86-DGA [ 5795.727] (II) Initializing extension XFree86-DRI [ 5795.728] (II) Initializing extension DRI2 [ 5797.342] (II) config/udev: Adding input device ADB keyboard (/dev/input/event0) [ 5797.348] (**) ADB keyboard: Applying InputClass "libinput keyboard catchall" [ 5797.349] (II) LoadModule: "libinput" [ 5797.363] (II) Loading /usr/lib/xorg/modules/input/libinput_drv.so [ 5797.413] (II) Module libinput: vendor="X.Org Foundation" [ 5797.413] compiled for 1.20.4, module version = 0.29.0 [ 5797.413] Module class: X.Org XInput Driver [ 5797.414] ABI class: X.Org XInput driver, version 24.1 [ 5797.415] (II) Using input driver 'libinput' for 'ADB keyboard' [ 5797.417] (**) ADB keyboard: always reports core events [ 5797.417] (**) Option "Device" "/dev/input/event0" [ 5797.419] (**) Option "_source" "server/udev" [ 5797.478] (II) event0 - ADB keyboard: is tagged by udev as: Keyboard [ 5797.479] (II) event0 - ADB keyboard: device is a keyboard [ 5797.483] (II) event0 - ADB keyboard: device removed [ 5797.488] (**) Option "config_info" "udev:/sys/devices/virtual/input/input0/event0" [ 5797.488] (II) XINPUT: Adding extended input device "ADB keyboard" (type: KEYBOARD, id 6) [ 5797.489] (**) Option "xkb_model" "macintosh" [ 5797.489] (**) Option "xkb_layout" "us" [ 5798.036] (II) event0 - ADB keyboard: is tagged by udev as: Keyboard [ 5798.037] (II) event0 - ADB keyboard: device is a keyboard [ 5798.047] (II) config/udev: Adding input device ADB mouse (/dev/input/event1) [ 5798.047] (**) ADB mouse: Applying InputClass "libinput pointer catchall" [ 5798.047] (II) Using input driver 'libinput' for 'ADB mouse' [ 5798.048] (**) ADB mouse: always reports core events [ 5798.048] (**) Option "Device" "/dev/input/event1" [ 5798.048] (**) Option "_source" "server/udev" [ 5798.059] (II) event1 - ADB mouse: is tagged by udev as: Mouse [ 5798.060] (II) event1 - ADB mouse: device is a pointer [ 5798.063] (II) event1 - ADB mouse: device removed [ 5798.067] (**) Option "config_info" "udev:/sys/devices/virtual/input/input1/event1" [ 5798.067] (II) XINPUT: Adding extended input device "ADB mouse" (type: MOUSE, id 7) [ 5798.076] (**) Option "AccelerationScheme" "none" [ 5798.078] (**) ADB mouse: (accel) selected scheme none/0 [ 5798.078] (**) ADB mouse: (accel) acceleration factor: 2.000 [ 5798.078] (**) ADB mouse: (accel) acceleration threshold: 4 [ 5798.088] (II) event1 - ADB mouse: is tagged by udev as: Mouse [ 5798.089] (II) event1 - ADB mouse: device is a pointer [ 5798.095] (II) config/udev: Adding input device ADB mouse (/dev/input/mouse0) [ 5798.096] (II) No input driver specified, ignoring this device. [ 5798.096] (II) This device may have been added with another device file. [ 6805.460] (II) event0 - ADB keyboard: device removed [ 6805.507] (II) event1 - ADB mouse: device removed [ 6811.516] (II) event0 - ADB keyboard: is tagged by udev as: Keyboard [ 6811.544] (II) event0 - ADB keyboard: device is a keyboard [ 6811.576] (II) event1 - ADB mouse: is tagged by udev as: Mouse [ 6811.578] (II) event1 - ADB mouse: device is a pointer
