start-desktop fluxbox with tiny, unreadable fonts

[Mauro]

Dear maintainer,

on my debian testing installation I run xpra (version 2.4.3-r21350M) with the following command:

xpra start-desktop :100 --start="xrandr -s 1024x768" --start="fluxbox -display=:100"

When I attach the display on another machine (I tried different PCs with different operating systems and xpra versions) with the command

xpra attach ssh:hostname:100

a new window with fluxbox with extremely tiny, unreadable fonts appears.

I have tried starting the server with the --dpi=96 or other values but nothing changes.

Here the log file of screen :100

2019-01-23 11:29:02,887 xpra X11 desktop version 2.4.3-r21350M 64-bit
2019-01-23 11:29:02,887  uid=1000 (test), gid=1000 (test)
2019-01-23 11:29:02,887  running with pid 4774 on Linux Debian testing buster
2019-01-23 11:29:02,887  connected to X11 display :100 with 24 bit colors
2019-01-23 11:29:02,888   :100.0 (2167x1084 mm - DPI: 96x95)
2019-01-23 11:29:02,888     monitor 1
2019-01-23 11:29:02,985 xpra is ready.

The command DISPLAY=:100 xpdyinfo returns the following

name of display:    :100
version number:    11.0
vendor string:    The X.Org Foundation
vendor release number:    12003000
X.Org version: 1.20.3
maximum request size:  16777212 bytes
motion buffer size:  256
bitmap unit, bit order, padding:    32, LSBFirst, 32
image byte order:    LSBFirst
number of supported pixmap formats:    7
supported pixmap formats:
    depth 1, bits_per_pixel 1, scanline_pad 32
    depth 4, bits_per_pixel 8, scanline_pad 32
    depth 8, bits_per_pixel 8, scanline_pad 32
    depth 15, bits_per_pixel 16, scanline_pad 32
    depth 16, bits_per_pixel 16, scanline_pad 32
    depth 24, bits_per_pixel 32, scanline_pad 32
    depth 32, bits_per_pixel 32, scanline_pad 32
keycode range:    minimum 8, maximum 255
focus:  window 0x44, revert to PointerRoot
number of extensions:    25
    BIG-REQUESTS
    Composite
    DAMAGE
    DOUBLE-BUFFER
    DRI2
    Generic Event Extension
    MIT-SCREEN-SAVER
    MIT-SHM
    Present
    RANDR
    RECORD
    RENDER
    SECURITY
    SHAPE
    SYNC
    X-Resource
    XC-MISC
    XFIXES
    XFree86-DGA
    XFree86-VidModeExtension
    XINERAMA
    XInputExtension
    XKEYBOARD
    XTEST
    XVideo
default screen number:    0
number of screens:    1

screen #0:
  dimensions:    1024x768 pixels (2167x1084 millimeters)
  resolution:    12x18 dots per inch
  depths (7):    24, 1, 4, 8, 15, 16, 32
  root window id:    0x44
  depth of root window:    24 planes
  number of colormaps:    minimum 1, maximum 1
  default colormap:    0x20
  default number of colormap cells:    256
  preallocated pixels:    black 0, white 16777215
  options:    backing-store WHEN MAPPED, save-unders NO
  largest cursor:    64x64
  current input event mask:    0xda001f
    KeyPressMask             KeyReleaseMask           ButtonPressMask          
    ButtonReleaseMask        EnterWindowMask          StructureNotifyMask      
    SubstructureNotifyMask   SubstructureRedirectMask PropertyChangeMask       
    ColormapChangeMask       
  number of visuals:    3
  default visual id:  0x21
  visual:
    visual id:    0x21
    class:    TrueColor
    depth:    24 planes
    available colormap entries:    256 per subfield
    red, green, blue masks:    0xff0000, 0xff00, 0xff
    significant bits in color specification:    8 bits
  visual:
    visual id:    0x22
    class:    DirectColor
    depth:    24 planes
    available colormap entries:    256 per subfield
    red, green, blue masks:    0xff0000, 0xff00, 0xff
    significant bits in color specification:    8 bits
  visual:
    visual id:    0x42
    class:    TrueColor
    depth:    32 planes
    available colormap entries:    256 per subfield
    red, green, blue masks:    0xff0000, 0xff00, 0xff
    significant bits in color specification:    8 bits

A very very low resolution of 12x18 dots per inch is detected. Maybe is this the reason for the tiny fonts? Any suggestion?

The same behavior occur if I launch openbox instead of fluxbox.

Thank you in advance.

[Antoine Martin]

My guess is that you're not using the patched dummy driver from xpra's repository, as you did not get xpra 2.4.3 r21350M from us.

[Mauro]

I have just installed xpra v2.4.3-r21365 from xpra.org but nothing changed.

[Antoine Martin]

I have just installed xpra v2.4.3-r21365 from xpra.org but nothing changed.

What you need is the patched dummy driver which is in the xpra repository for most distribution variants.
I don't know what your distro is, so I can't be certain.

To verify, print the version information for the xorg dummy package on your system.

[Mauro]

My distribution is debian testing.

I just reinstall completely xpra and xserver-xorg-video-dummy, reboot the system, and now fonts are readable. Thank you for your great help!