I think there is also a potential mistake in Xorg configuration. I limited horizontal sync to the range 70-75 so it may happen that some screen do not fit at all. I should switch to a larger range, for example 70-90.

I think the problem is that your monitor is not detected as an LCD monitor and it does not support a 70Hz refresh rate at 1280×1024 (a limit which is added for CRT monitors not to blink). Could you please send me the hardware report for your configuration using the new tool in “Settings → System”? If you're connected to the Internet you'll be able to post the report directly to Gna.

NB: is it really annoying to have 1152×864 instead of 1280×1024?

More and more strange, your Xorg.conf looks good, it has the following line:

Modes "1280x1024" "1152x864" "1024x768" "800x600" "640x480" "400x300" "320x240"

Could you type the following command in the console to list all available resolutions:

$ xrandr

You should get something like this:

$ xrandr
Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 1680 x 1680
VGA connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
1680x1050 60.0+ 60.0 60.0
1600x1200 60.0 59.9
1600x1024 60.0
1400x1050 74.8 70.0 60.0 60.0
1280x1024 75.0 59.9 60.0
1440x900 60.2 59.9
1280x960 60.0 59.9
[…]

Maybe 1280x1024 is not available at a refreshing rate greater than 70 Hz?

Strange, could you send your file “/etc/X11/xorg.conf”?

Agree!

this one does not work again

Could you send me your file “/etc/X11/xorg.conf”? I would like to check if resolution is written inside or not.

OK I think your LCD screen is not detected as an LCD screen. I've already seen this happening. Indeed I added screen resolution limits because X server defaults to use the largest detected one (I think that's what Qimo does). So at home on my 19" CRT, it uses a very high 1600×1280 resolution which make icons and text very small. Currently the algorithm I added is quite simple:

if LCD detected
use native resolution
else
if monitor/card supports vertical refresh ≥ 70 Hz
force the use of a vertical refresh ≥ 70 Hz
add resolutions ≤ 1152×864

The test against vertical refresh frequency permits to avoid screen blinking, which tires eyes (this gives me headaches). In the future we could replace the static 1152×864 limit with a computation of physical screen resolution (dot/inch) but trials are required to find how undetected LCD displays can get their native resolution from computation…

As a workaround, if you feel that most Russian people have LCD screen, it is possible to remove the resolution limit or to increase it to 1280×1024, at least on the Russian version. You can test it on a running DoudouLinux system. Type the following in the console:

$ sudo sed -i 's/"1152×864"/"1280×1024" "1152×864"/' /etc/X11/xorg.conf

Then press Ctrl+Alt+Backspace or close the session to restart X.

What kind of monitor do you have, CRT, LCD?

DoudouLinux tries to set a resolution below 1152×864 for CRT screens because the interface is to small on higher resolutions. On the contrary on LCD screens it should let the system use the native LCD resolution whatever it is because it would otherwise lead to a blurring effect. But sometimes LCD detection does not work…